Chapter 2 Quiz

If your car runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why is a. inertia b. gravity c. acceleration d. air resistance

a. inertia

As an object freely falls downward, its a. velocity increases b. acceleration increases c. both d neither

a. velocity increase

Whirl a rock at the end of a string on an ice-covered pond and it follows a circular path. If the string breaks, the tendency of the rock is to a. continue to follow a circular path b. follow a straight-line path c. follow a wave-shaped path

b. follow a straight-line path

The gain in speed each second for a freely-falling object is about a. 0.0 b. 5 m/s c. 10 m/s d. 20 m/s e. depends on initial speed

c. 10 m/s

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is a. zero b. about 15 m/s c. about 30 m/s d. about 45 m/s e. more information is needed for an estimate

c. about 30 m/s

A sheet of paper can withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that a. the milk carton has no acceleration b. there is an action-reaction pair of forces c. gravity tends to hold the milk carton secure d. the milk carton has inertia e. none of these

d. the milk carton has inertia