Unit C: Force and Motion Review

A rocket can travel without engine power at constant

speed in the same direction in outer space. This

condition is best explained by the concept of _________.

• gravitation

• inertia

• acceleration

• action-reaction (Newton’s Third Law)

A table exerts a 20 newton force on a 10 kg book lying

on the table. The force exerted by the book on the table

is

• 20 N

• 10 N

• 2 N

• 1 N

When an object is moving with constant velocity, which is

true?

• An unbalanced force is acting

• The object is undergoing a change in energy

• The object is accelerated

• The total (net) force acting on the object is zero

Which best describes how forces must interact for a kite

to sail up into the air?

• The force of gravity must be equal to the force of the

  wind.

• The force of gravity must be greater than the force of

  the wind.

• The force of the wind must be greater than the force

  of gravity.

• The force of the person flying the kite must be equal

  to the force of the wind.

A tablecloth can be withdrawn from under dishes on a

table when it is jerked quickly. The reason this "magic"

trick works is that

• the dishes have inertia

• the dishes have very little weight

• gravity pulls very hard on the dishes

• none of the above

A bowling ball has more mass than an apple. The

bowling ball also has more

• acceleration

• energy

• velocity

• inertia

Which of the following has the most inertia?

• A 90 kg wrestler sitting on a mat

• A 50 kg student running with a velocity of 5m/s

• A 2 kg baseball in free fall

• A 7 kg bowling ball rolling at a velocity of 4 m/s

A change in position of an object is its _________.

• motion

• acceleration

• speed

• inertia

If a force acts constantly on a stationary object, the

object will

• remain stationary

• move at a constant speed in the direction of the force

• accelerate in the direction of the force

• accelerate in the opposite direction of the force

If no force is being applied to a stationary object, the

object will

• remain stationary

• accelerate in the direction of the force

• move at a constant speed in the direction of the force

• accelerate in the opposite direction of the force