Name:    Chapter 3 Pre-Test

Multiple Choice
Identify the choice that best completes the statement or answers the question.

1.

Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane?
 a. The ball would not roll up the other plane at all. b. To nearly its original height c. To about one quarter its original height d. To nearly twice its original height e. To nearly half its original height

2.

Friction is a force that always acts
 a. perpendicular to an object's motion. b. opposite to an object's motion. c. in the same direction as an object's motion.

3.

The law of inertia states that an object
 a. will continue moving at the same velocity unless an outside force acts on it. b. will continue moving in a straight line unless an outside force acts on it. c. that is not moving will never move unless a force acts on it. d. at rest will remain at rest unless acted on by an outside force. e. will do all of the above.

4.

The law of inertia applies to
 a. objects at rest. b. moving objects. c. both moving and nonmoving objects.

5.

Friction
 a. comes from microscopic bumps that act as obstructions to the object's motion. b. is the name given to the force acting between surfaces sliding past one another. c. acts in a direction that opposes the motion of an object. d. all of the above e. none of the above

6.

Compared to its weight on Earth, a 10-kg object on the moon will weigh
 a. the same amount. b. less. c. more.

7.

Compared to its mass on Earth, the mass of a 10-kg object on the moon is
 a. the same. b. more. c. less.

8.

Which has more mass, a kilogram of feathers or a kilogram of iron?
 a. The feathers b. The iron c. Neither—they both have the same mass.

9.

An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass?
 a. The one on Earth b. The one on the moon c. They have the same mass. d. Not enough information to say

True/False
Indicate whether the statement is true or false.

10.

Friction refers to the force between two surfaces that are sliding past each other.

11.

A force can be simply defined as a push or a pull.

12.

Inertia is the property that every material object has; inertia resists changes in an object's state of motion.

13.

If a hockey puck were to slide on a perfectly frictionless surface, it will eventually slow down because of its inertia.

14.

The amount of matter in an object is its weight.

15.

The SI unit of mass is the newton.

16.

The force due to gravity acting on an object is its mass.

17.

The SI unit of force is the kilogram.

18.

An astronaut weighs the same on Earth as in space.

19.

An astronaut has the same mass on Earth as in space.

20.

The reason a penny thrown straight up inside an airplane will come back to your hand is that you, the air inside the plane, and the penny are all moving at the same horizontal velocity.