Physics - Motion

1. Which pair of variables defines motion?

change of position and passage of time

speed and distance

speed and passage of time

time and momentum

2. If an astronaut, freely floating in space, tries to throw away a spent fuel container that has the same mass as the astronaut himself, what will happen to the astronaut?

Nothing happens to the astronaut. He will stay where he is and the container will fly away at the speed given to it by the astronaut.

The astronaut moves away in an opposite direction just as fast as the container moves.

Nothing happens to the astronaut or container. The astronaut cannot throw the container since he has no firm ground to stand on.

The astronaut will recoil slightly but quickly stop while the container continues moving away at a constant speed.

3. A person walking on a level surface moves forward because the forces of

his feet pushing forward on the ground.

the ground pushing backward on his feet

the ground pushing forward on his feet.

his feet pushing backward on the ground.

4. The conservation of momentum is correctly expressed by which of the following statements? The total momentum of interacting objects

always remains the same.

remains the same if there are no internal forces.

usually remains the same.

remains the same if there are no external forces.

5. According to Newton’s second law of motion, what causes a change in the motion of an object? A (An)

change in velocity.

net force.

decrease in inertia.

acceleration.

6. Which statement correctly characterizes momentum, as understood in the physical sciences?

The product of mass and velocity is large for an object with a large momentum.

An object with a large momentum has a large mass.

An object with a large momentum has a large velocity.

Momentum is a measure of an object’s tendency to continue moving.

7. Which of the following statements correctly states Newton’s first law of motion?

Every object retains its state of rest or its state of uniform straight-line motion unless acted upon by an unbalanced force.

Every object retains its state of rest or its state of accelerated straight-line motion unless acted upon by an unbalanced force.

None of the above is correct.

Every object retains its state of rest or its state of uniform straight-line motion unless acted upon by a balanced force.

8. What is the unit of weight in the metric system?

pound

newton

meters per second squared

kilogram

9. What are the metric units for momentum?

newton • m

newton

kg • m/s

kg • m/s2

10. In Newton’s second law of motion, what is the relationship between acceleration and mass? Acceleration

does not depend on mass.

is divided by mass.

is directly proportional to mass.

is inversely proportional to mass.

11. If the forces on an object are balanced, the object will

neither A nor B

remain at rest if initially at rest.

both A and B

continue moving in a straight line if initially moving in a straight line.

12. What is a difference between an object’s speed and velocity?

There is no difference.

Velocity includes the direction of travel whereas speed does not.

Speed includes direction as well as the rate of travel.

Velocity includes time during which travel occurred.

13. In order for an object to move in a circular path at a constant speed, which set of conditions must be satisfied?

A force must be applied continuously at right angles to the object’s motion to produce a circular path.

A force must be applied once to start circular motion, then the object will continue in a circular path.

No force need be applied since speed remains constant.

A force must be applied continuously against the object’s motion to cause it to turn away into a circular path.

14. According to Newton’s second law of motion, acceleration is proportional to force. That means a larger force

doesn’t affect acceleration.

produces a smaller acceleration.

produces a smaller mass.

produces a larger acceleration.

15. What feature of motion is described by acceleration?

The rate at which speed changes.

How quickly final velocity is reached.

Whether motion is speeding up or slowing down.

The rate at which velocity changes.

16. Which of the following indicate that an object has been subjected to an unbalanced force?

Any of the above.

The object speeds up.

The object changes direction.

The object slows down.

17. The term inertia means which of the following? The tendency of an object to

maintain its mass.

remain in rest or motion.

remain in motion.

stop the motion of other objects.

18. Which two fundamental properties are used to describe motion?

speed and time

mass and distance

distance and speed

length and time

19. Which of the following correctly states Newton’s third law of motion? Forces occur in matched pairs that are

opposite in magnitude and opposite in direction.

opposite in magnitude and equal in direction.

equal in magnitude and opposite in direction.

equal in magnitude and equal in direction.

20. Which of the following statements are true of both weight and mass?

Gravity is necessary to measure both weight and mass.

Mass depends on gravity, weight does not.

Weight is a force, mass is a measure of inertia.

Heavier objects weigh more than light objects.

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Physics – Motion