chapter 2 RAT

Question 1

If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in
A. a curved path.
B. a straight-line path.
C. a path directed to Earth’s surface.
D. an outward spiral path.

Answer 1

B. a straight-line path

Question 2

A ball rolls down a curved ramp as shown. As its speed increases, its rate of gaining speed
A. increases.
B. decreases.
C. remains unchanged.
D. none of these

Answer 2

B. decreases

Question 3

A block of ice sliding without friction down an icy flat incline gains speed, while its acceleration
A. increases.
B. decreases.
C. remains unchanged.
D. is zero.

Answer 3

C. remains unchanged

Question 4

The reason why a 10-kg rock falls no faster than a 5-kg rock in free fall is that the
A. 10-kg rock has greater acceleration.
B. 5-kg rock has greater acceleration.
C. force of gravity is the same for both.
D. force/mass ratio is the same for both.

Answer 4

D. force/mass ratio is the same for both

Question 5

As mass is added to a cart pushed by a constant force, its acceleration
A. remains constant.
B. increases.
C. decreases.
D. quickly reaches zero.

Answer 5

C. decreases

Question 6

The amount of air resistance that acts on a wingsuit flyer (and a flying squirrel) depends on the flyer’s
A. area.
B. speed.
C. area and speed.
D. acceleration.

Answer 6

C. area and speed

Question 7

You drop a pillow off the edge of the administration building on your campus. While the pillow is falling, its speed
A. and acceleration both increase.
B. and acceleration both decrease.
C. increases and its acceleration decreases.
D. decreases and its acceleration increases.

Answer 7

C. increases and its acceleration decreases

Question 8

Alex pulls on the end of a spring attached to a wall. The reaction to Alex’s pull on the spring is
A. the wall pulling oppositely on the spring.
B. the spring pulling on Alex.
C. both the wall and the spring pulling on Alex.
D. none of these

Answer 8

B. the spring pulling on Alex

Question 9

The amount of force with which a boxer’s punch lands depends mainly on the
A. physical condition of the boxer.
B. mass of what’s being hit.
C. boxer’s attitude.
D. none of these

Answer 9

B. mass of what’s being hit

Question 10

The force that propels a rocket is provided by
A. gravity.
B. Newton’s laws of motion.
C. its exhaust gases.
D. the atmosphere against which the rocket pushes.

Answer 10

C. its exhaust gases