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Sample Test

An Introduction to Astronomy, 9e (Arny)

Chapter 3   Gravity and Motion

 

1) What property summarizes a body’s tendency to stay in the state of rest or motion?

1.   A) temperature

2.   B) acceleration

3.   C) pressure

4.   D) inertia

5.   E) volume

 

Answer:  D

Difficulty: 1 Easy

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Inertia

 

2) Which statement is true about Newton’s First law of motion?

1.   A) A body at rest stays at rest unless a force is applied to it.

2.   B) A body in motion stays in motion unless a force is applied to it.

3.   C) A body in motion has the tendency to come to a stop eventually.

4.   D) A body at rest stays at rest unless a force is applied to it and a body in motion has the tendency to come to a stop eventually.

5.   E) A body at rest stays at rest unless a force is applied to it and a body in motion stays in motion unless a force is applied to it.

 

Answer:  E

Difficulty: 1 Easy

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Inertia; Newton’s Laws of Motion

 

 

3) While riding a bicycle, if you stop pedaling you will still continue to move forward due to ________.

1.   A) gravity

2.   B) inertia

3.   C) acceleration

4.   D) pressure

 

Answer:  B

Difficulty: 1 Easy

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Inertia

 

4) Consider a large truck and a small car driving up a straight, steep hill. The truck is moving at 60 miles per hour and the car at 30 miles per hour. Assuming that the speeds are constant, which of the two vehicles experiences a larger net force?

1.   A) the truck

2.   B) the car

3.   C) the same: zero net force

 

Answer:  C

Difficulty: 2 Medium

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

5) A car is moving down a straight, steep hill. By applying the brake, the driver is able to keep the speed of the car constant. Which of the following statements is true in this situation?

1.   A) There is a net force on the car.

2.   B) The net acceleration is negative.

3.   C) There is no net force on the car.

4.   D) The net acceleration is positive.

 

Answer:  C

Difficulty: 2 Medium

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

 

6) When a bus makes a sudden stop the passengers lurch forward as a consequence of ________ law.

1.   A) Newton’s First

2.   B) Kepler’s Third

3.   C) Newton’s Third

4.   D) Kepler’s First

 

Answer:  A

Difficulty: 1 Easy

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Inertia

 

7) An object is moving in a straight line and at a constant speed of 60 kilometers per hour. We therefore conclude that the net force on this object is zero.

 

Answer:  TRUE

Difficulty: 1 Easy

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Inertia

 

8) An object moving on a circle at constant speed is an example of accelerated motion.

 

Answer:  TRUE

Difficulty: 1 Easy

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Inertia; Mass and Acceleration

 

 

9) What do we call the tendency of a body at rest to remain at rest or a body in motion to remain in motion?

1.   A) gravity

2.   B) the “action-reaction” law

3.   C) the tendency of a person to stay in bed in the morning

4.   D) inertia

 

Answer:  D

Difficulty: 1 Easy

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Inertia; Newton’s Laws of Motion

 

10) Galileo hypothesized that a ball rolling along a flat surface with no change in speed would ________.

1.   A) have no net force acting on it

2.   B) accelerate, depending on its mass

3.   C) have a net force acting on it, upward from the surface

4.   D) slow down as it rolled down a slope

5.   E) speed up as it rolled up a slope

 

Answer:  A

Difficulty: 2 Medium

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Inertia; Newton’s Laws of Motion

 

11) A magician pulls a tablecloth out from under the settings on a dinner table without disturbing the dishes. This is an example of ________.

1.   A) Newton’s First law of motion

2.   B) Newton’s Second law of motion

3.   C) Newton’s Third law of motion

4.   D) the Hannum-Barnum law

5.   E) Kepler’s laws of motion

 

Answer:  A

Difficulty: 2 Medium

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Inertia; Newton’s Laws of Motion

 

12) A parachutist jumps out of an airplane and opens her parachute. She then floats downward at a constant rate. Why is she not accelerating?

1.   A) The parachute provides an upward force to balance gravity, so the net force is zero.

2.   B) She is accelerating, but gravity’s pull is weak at high altitudes.

3.   C) As she falls, she is weightless and therefore cannot accelerate.

4.   D) The parachute has very little mass, so its inertia is negligible.

5.   E) The parachutist exerts a gravitational pull on Earth that is equal to its pull on her.

 

Answer:  A

Difficulty: 2 Medium

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Inertia; Newton’s Laws of Motion

 

13) What is Newton’s First law of motion?

1.   A) A body continues in a state of rest or uniform motion in a straight line unless made to change that state by forces acting on it.

2.   B) Force equals mass times acceleration, F=ma.

3.   C) Every mass exerts a force on any other mass that is proportional to the product of the masses divided by the square of the distance between them.

4.   D) When two bodies interact, they create equal and opposite forces on each other.

 

Answer:  A

Difficulty: 2 Medium

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Inertia; Newton’s Laws of Motion

 

 

14) How can we tell that the Moon is held in orbit around Earth by a force?

1.   A) The Moon follows a curved path as it orbits.

2.   B) The Moon’s gravity creates tides in Earth’s oceans.

3.   C) The Moon is always at the same distance from Earth.

4.   D) One side of the Moon is always facing Earth.

5.   E) Earth’s gravitational force pulls inward on the Moon.

 

Answer:  A

Difficulty: 2 Medium

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Inertia; Newton’s Laws of Motion

 

15) If you see a body in space that is not moving in a straight line at constant speed, what can you say about it?

1.   A) It must be an artificial satellite.

2.   B) There must be a net force acting on it.

3.   C) It is not subject to any outside forces.

4.   D) None of these choices is correct.

 

Answer:  B

Difficulty: 1 Easy

Section:  03.01

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

16) When an astronaut experiences weightlessness in space, their mass is

1.   A) zero.

2.   B) the same as on Earth.

3.   C) double than on Earth.

4.   D) becoming lesser and lesser as s/he is going higher.

 

Answer:  B

Difficulty: 2 Medium

Section:  03.02

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Universal Law of Gravity

 

 

17) After tying a string to a rock, you twirl the rock around above your head. If the string were to break, what path would the rock follow?

1.   A) The rock will fall down immediately.

2.   B) The rock will complete the circle before falling down.

3.   C) The rock will go in a straight line before falling down.

4.   D) The rock will fly upward.

 

Answer:  C

Difficulty: 2 Medium

Section:  03.02

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Inertia

 

18) The reason Earth’s moon does not fall into Earth is because it orbits beyond Earth’s gravitational pull.

 

Answer:  FALSE

Difficulty: 1 Easy

Section:  03.02

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Universal Law of Gravity

 

19) An astronaut in orbit around Earth drops her pen, and it floats gently next to her hand. Why does it not fall to the floor?

1.   A) There is no gravity in space.

2.   B) The gravitational pull is very weak at typical altitudes for orbiting spacecraft.

3.   C) Objects in orbit have no mass.

4.   D) All objects in the spacecraft are falling toward Earth at the same rate.

5.   E) The net force on the pen is zero.

 

Answer:  D

Difficulty: 2 Medium

Section:  03.02

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

 

20) In your office, you have a rolling chair and a rolling filing cabinet. The chair weighs 10 pounds, and the filing cabinet weighs 50 pounds (it’s partly full). If you push both of them away with about the same strength

1.   A) the chair will accelerate about 25 times as much as the cabinet.

2.   B) the cabinet will accelerate about 25 times as much as the chair.

3.   C) the chair will accelerate about 5 times as much as the cabinet.

4.   D) the cabinet will accelerate about 5 times as much as the chair.

5.   E) both will accelerate about the same.

 

Answer:  C

Difficulty: 2 Medium

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  3. Apply

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration

 

21) If the net force acting on an object doubles, then the ________ doubles as well.

1.   A) mass

2.   B) acceleration

3.   C) speed

4.   D) velocity

 

Answer:  B

Difficulty: 2 Medium

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration

 

 

22) Which of the following objects (A–D) are accelerating? A) an object at rest, B) an object in motion in a straight line at a constant speed, C) an object in motion in a straight line with increasing speed, D) an object moving in a circle at constant speed.

1.   A) an object at rest only

2.   B) all but an object at rest

3.   C) an object in motion in a straight line with increasing speed only

4.   D) an object in motion in a straight line with increasing speed and an object moving in a circle at constant speed.

 

Answer:  D

Difficulty: 1 Easy

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration

 

23) An ion engine provides a small but constant force on a spacecraft as it moves from Earth to Pluto. Compare the speed of the spacecraft near the beginning of its journey with its speed as it flies past Pluto.

1.   A) The spacecraft’s speed at Pluto is the same as its speed near Earth.

2.   B) The spacecraft’s speed at Pluto is slower than its speed near Earth.

3.   C) The spacecraft’s speed at Pluto is faster than its speed near Earth.

4.   D) The relative speed cannot be determined with the information given.

 

Answer:  C

Difficulty: 1 Easy

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration

 

 

24) An ion engine provides a small but constant force on a spacecraft as it moves from Earth to Pluto. Compare the acceleration of the spacecraft near the beginning of its journey with its acceleration as it flies past Pluto.

1.   A) The spacecraft’s acceleration at Pluto is the same as its acceleration near Earth.

2.   B) The spacecraft’s acceleration at Pluto is slower than its acceleration near Earth.

3.   C) The spacecraft’s acceleration at Pluto is faster than its acceleration near Earth.

4.   D) The relative acceleration cannot be determined with the information given.

 

Answer:  A

Difficulty: 1 Easy

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration

 

25) What is Newton’s Second law of motion?

1.   A) A body continues in a state of rest or uniform motion in a straight line unless made to change that state by forces acting on it.

2.   B) Every mass exerts a force on any other mass that is proportional to the product of the masses divided by the square of the distance between them.

3.   C) Force equals mass times acceleration, F = ma.

4.   D) When two bodies interact, they create equal and opposite forces on each other.

 

Answer:  C

Difficulty: 2 Medium

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration

 

26) A 200-kg spacecraft is launched to the Moon. While in orbit around the Moon, its weight is ________.

1.   A) zero

2.   B) 200 kg

3.   C) about 1/6 its weight on Earth

4.   D) The answer depends on how close to the Moon the ship is orbiting.

 

Answer:  A

Difficulty: 1 Easy

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration; Surface Gravity and Weight

 

27) A 200-kg spacecraft is launched to the Moon. While in orbit around the Moon, its mass is ________.

1.   A) zero

2.   B) 200 kg

3.   C) about 1/6 its mass on Earth

4.   D) The answer depends on how close to the Moon the ship is orbiting.

 

Answer:  B

Difficulty: 1 Easy

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration; Surface Gravity and Weight

 

28) A 200-kg spacecraft is launched to the Moon. After it has landed on the Moon, its weight is ________.

1.   A) zero

2.   B) 200 kg

3.   C) about 1/6 its weight on Earth

4.   D) The answer depends on which side of the Moon the spacecraft landed on.

 

Answer:  C

Difficulty: 1 Easy

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration; Surface Gravity and Weight

 

29) A 200-kg spacecraft is launched to the Moon. After it has landed on the Moon, its mass is ________.

1.   A) zero

2.   B) 200 kg

3.   C) about 1/6 its mass on Earth

4.   D) The answer depends on which side of the Moon the spacecraft landed on.

 

Answer:  B

Difficulty: 1 Easy

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration; Surface Gravity and Weight

 

30) A weather satellite moves at a constant orbital speed around Earth. Is this satellite accelerating?

1.   A) yes, the satellite is accelerating — its speed is constant but its direction is changing.

2.   B) yes, the satellite is accelerating — the force of gravity is pulling it toward the ground.

3.   C) yes, the satellite is accelerating — it is in freefall toward the ground.

4.   D) Yes, the satellite is accelerating — its speed is constant but its direction is changing and yes, the satellite is accelerating — it is in freefall toward the ground.

5.   E) Yes, the satellite is accelerating — its speed is constant but its direction is changing; yes, the satellite is accelerating — the force of gravity is pulling it toward the ground; and yes, the satellite is accelerating — it is in freefall toward the ground, are correct.

 

Answer:  E

Difficulty: 1 Easy

Section:  03.03

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Mass and Acceleration

 

31) The recoil experienced when firing a shotgun is a consequence of ________ law.

1.   A) Newton’s First

2.   B) Kepler’s Third

3.   C) Newton’s Third

4.   D) Kepler’s First

 

Answer:  C

Difficulty: 1 Easy

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

 

32) The force that pulls an upward going ball back to Earth and keeps the Moon in its orbit is called ________.

1.   A) inertia

2.   B) gravity

3.   C) pressure

4.   D) escape speed

 

Answer:  B

Difficulty: 1 Easy

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Universal Law of Gravity

 

33) If you double the distance between two bodies, the force of gravity between them would

1.   A) double.

2.   B) become four times as strong.

3.   C) decrease by one half.

4.   D) decrease by one fourth.

 

Answer:  D

Difficulty: 1 Easy

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Universal Law of Gravity

 

34) The Moon is gravitationally attracted to Earth. Is Earth gravitationally attracted to the Moon?

1.   A) Yes, but the force of attraction is less.

2.   B) Yes, and the force of attraction is the same.

3.   C) Yes, but the force of attraction is greater.

4.   D) No, the Moon has no gravity.

 

Answer:  B

Difficulty: 1 Easy

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Universal Law of Gravity

 

 

35) Which of the following objects is obeying Newton’s laws of motion?

1.   A) a sleeping cat

2.   B) a satellite orbiting Earth

3.   C) a runner racing around a track

4.   D) a skydiver falling under the force of gravity

5.   E) All of these choices are correct.

 

Answer:  E

Difficulty: 1 Easy

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

36) Consider an apple falling from a tree. Which of the following applies to this situation?

1.   A) The apple is attracting Earth.

2.   B) Earth is attracting the apple.

3.   C) Earth is attracting the apple; the apple is not attracting Earth.

4.   D) The apple is attracting Earth and Earth is attracting the apple.

 

Answer:  D

Difficulty: 1 Easy

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

37) Newton’s laws of motion apply only to objects experiencing the force of gravity. They do not apply to objects experiencing a magnetic force.

 

Answer:  FALSE

Difficulty: 1 Easy

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

 

38) By Newton’s Third law, Earth’s pull on the Moon is equal to the Moon’s pull on Earth.

 

Answer:  TRUE

Difficulty: 1 Easy

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Universal Law of Gravity

 

39) The gravitational force exerted by the Sun on Earth is ________ the gravitational force exerted by Earth on the Sun.

1.   A) greater than

2.   B) less than

3.   C) equal to

4.   D) unrelated to

 

Answer:  C

Difficulty: 2 Medium

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Universal Law of Gravity

 

40) What is Newton’s Third law of motion?

1.   A) When two bodies interact, they create equal and opposite forces on each other.

2.   B) Force equals mass times acceleration, F = ma.

3.   C) Every mass exerts a force on any other mass that is proportional to the product of the masses divided by the square of the distance between them.

4.   D) A body continues in a state of rest or uniform motion in a straight line unless made to change that state by forces acting on it.

 

Answer:  A

Difficulty: 2 Medium

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  1. Remember

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

 

41) A diver in midair is pulled toward the pool below by the force of gravity from Earth. Earth experiences an upward force from the diver that ________.

1.   A) is equal to the force on the diver by Earth

2.   B) is less than the force on the diver by Earth

3.   C) is greater than the force on the diver by Earth

4.   D) There is no upward force by the diver on Earth.

5.   E) There is insufficient information to determine the gravitational pull on Earth by the diver.

 

Answer:  A

Difficulty: 2 Medium

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

42) A bowling ball exerts a force on the pins when it strikes them, knocking them down. The force of the pins on the ball is ________.

1.   A) less than the force of the ball on the pins

2.   B) the same as the force of the ball on the pins

3.   C) larger than the force of the ball on the pins

4.   D) either less or more, depending on how hard the ball is thrown

5.   E) A system of ten bowling pins is too complicated to know the force on the ball.

 

Answer:  B

Difficulty: 2 Medium

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

43) A delivery truck and a car collide. Which vehicle experiences the greater force?

1.   A) the truck

2.   B) the car

3.   C) Both the car and the truck experience the same force.

4.   D) We need to know the speed of the truck and the car to find the answer.

5.   E) We need to know the mass of the truck and the car to find the answer.

 

Answer:  C

Difficulty: 2 Medium

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

44) A delivery truck and a car collide. Which vehicle experiences the greater acceleration?

1.   A) the truck

2.   B) the car

3.   C) Both the car and the truck experience the same acceleration.

4.   D) We need to know the speed of the truck and the car to find the answer.

5.   E) We need to know the mass of the truck and the car to find the answer.

 

Answer:  B

Difficulty: 2 Medium

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

45) A rocket in space fires its engines continuously until it runs out of fuel. Describe the motion of the rocket.

1.   A) The rocket’s speed increases until its engines stop firing, and then coasts in a straight line.

2.   B) The rocket’s speed is a constant value until the engines stop firing, and then coasts to a stop.

3.   C) The rocket’s speed increases until its engines stop firing, and then coasts to a stop.

4.   D) The rocket’s speed does not change, and it continues to move in a straight line.

5.   E) The rocket does not move, as the engines have nothing to push against.

 

Answer:  A

Difficulty: 2 Medium

Section:  03.04

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion

 

46) At which place on the Earth will you weigh less?

1.   A) at the equator

2.   B) at the North Pole

3.   C) at the South Pole

4.   D) You weigh the same at all of these places.

 

Answer:  A

Difficulty: 1 Easy

Section:  03.05

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Universal Law of Gravity; Surface Gravity and Weight

 

47) If you are lucky enough to get a chance to visit different planets of our Solar System, which of the following statements will be true?

1.   A) Your weight will change, but your mass will remain the same.

2.   B) Your mass will change, but your weight will remain the same.

3.   C) Both your weight and mass will remain the same.

4.   D) Both your weight and mass will change.

 

Answer:  A

Difficulty: 2 Medium

Section:  03.05

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Universal Law of Gravity; Surface Gravity and Weight

 

48) Which of the following objects is experiencing Earth’s gravitational force?

1.   A) a boat floating in water

2.   B) an airplane taking-off

3.   C) a skydiver falling under the force of gravity

4.   D) All of these choices are correct.

5.   E) Only an airplane taking-off and a skydiver falling under the force of gravity above.

 

Answer:  D

Difficulty: 1 Easy

Section:  03.05

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Newton’s Laws of Motion; Universal Law of Gravity

 

49) Suppose that the Sun started shrinking in size, without losing any mass. What would be the effect of the Sun’s change on the orbits of the planets?

1.   A) The orbits would become smaller in size.

2.   B) The orbits would become larger.

3.   C) The orbits would not be affected.

4.   D) The planets would escape.

 

Answer:  C

Difficulty: 3 Hard

Section:  03.05

Topic:  Gravity and Motion

Bloom’s:  2. Understand

Gradable:  automatic

Subtopic:  Universal Law of Gravity