Force & Motion Pre-Test

When discussion Force, the proper unit to apply is

• the Joule

• the Newton

• meters/second

• kg*m/s/s

The force that always acts opposite to the direction of motion of an object is called...

• gravity.

• inertia.

• friction.

• air resistance.

Which is the best definition of inertia?

• The resistance of a physical object to any change in its direction.

• The resistance of a physical object to any change in its state of matter.

• The resistance of a physical object to any change in its velocity.

• The resistance of any physical object to any change in its net force.

____ is the speed of an object and the direction of motion.

• Friction

• Mass

• Gravity

• Velocity

Why is it easier to push a footstool across a wooden floor than across carpet?

• Less friction

• More friction

• Less air resistance

• More air resistance

Lucy jumps off a bridge during a bungee jump. As she falls, the bungee cord is loose. Which two forces act on Lucy at this time?

• Inertia and friction

• Friction and gravity

• Gravity and air resistance

• Velocity and air resistance

What occurs to an object that is experiencing an unbalanced force?

• It may slow down.

• It may speed up.

• It may change direction.

• All of the above.

What is equilibrium?

• The removal of an unequal force.

• A state in which all forces are balanced.

• A state in which there are no forces acting on an object.

• A calm state of mind.

The greater the _____ of the object, the greater it will resist a change in its motion.

• mass

• weight

• height

• width

Two forces of equal magnitude act on an object at rest. Why would the object remain at rest?

• The two forces are parallel to each other.

• The two forces are in opposite directions.

• The two forces are in perpendicular directions.

• The two forces are in different directions.