Question 1

A car travels in a circle with constant speed.The net force on the car is

Accepted Answer

A) directed forward,in the direction of travel. 
B) directed toward the center of the curve. 
C) zero because the car is not accelerating. 
D) none of these

Question 2

Centrifugal forces are an apparent reality to observers in a reference frame that is

Accepted Answer

A) moving at constant velocity. 
B) an inertial reference frame. 
C) at rest. 
D) rotating. 
E) none of these

Question 3

A person weighs less at the equator than at the poles.The main reason for this has to do with

Accepted Answer

A) the spin of the Earth. 
B) the shape of the Earth. 
C) the influence of the sun,moon,and all the planets. 
D) the law of action and reaction.

Question 4

A huge rotating cloud of particles in space gravitate together to form an increasingly dense ball.As it shrinks in size,the cloud

Accepted Answer

A) rotates faster. 
B) rotates slower. 
C) rotates at the same speed. 
D) cannot rotate.

Question 5

A ring,a disk,and a solid sphere begin rolling down a hill together.The one to reach the bottom first is the

Accepted Answer

A) ring. 
B) disk. 
C) sphere. 
D) They all reach the bottom at the same time. 
E) Not enough information is given.

Question 6

A broom is easier to balance on its end when the heavier end (the brush end)is

Accepted Answer

A) nearest your hand. 
B) highest,farthest from your hand. 
C) same either way

Question 7

Which will roll down an incline in the shortest time,a can filled with water or the same can filled with ice?

Accepted Answer

A) water 
B) ice 
C) both the same 
D) Not enough information is given.

Question 8

If the planet Jupiter underwent gravitational collapse,its rate of rotation about its axis would

Accepted Answer

A) decrease. 
B) increase. 
C) stay the same. 
D) more information needed

Question 9

Suppose the circumference of a bicycle wheel is 2 meters.If it rotates at 1 revolution per second when you are riding the bicycle,then your speed will be

Accepted Answer

A) 1 m/s. 
B) 2 m/s. 
C) 3 m/s. 
D) 3)14 m/s. 
E) 6)28 m/s.

Question 10

For a system in mechanical equilibrium

Accepted Answer

A) the resultant force must be zero. 
B) the resultant torques must be zero. 
C) the resultant forces and torques must both be zero. 
D) the resultant forces and torques must be equal.

Question 11

A tightrope walker more easily balances on a tightwire if his pole

Accepted Answer

A) is held high. 
B) droops. 
C) is short but heavy.

Question 12

Horses that move with the fastest linear speed on a merry-go-round are located

Accepted Answer

A) near the center. 
B) near the outside. 
C) anywhere,because they all move at the same speed.

Question 13

Consider a string with several rocks tied along its length at equally spaced intervals.You whirl the string overhead so that the rocks follow circular paths.Compared to a rock in the middle of the string,a rock at the outer end moves

Accepted Answer

A) half as fast. 
B) twice as fast. 
C) at the same linear speed.

Question 14

A flywheel's diameter is twice that of another of the same shape and mass.The larger flywheel's rotational inertia is

Accepted Answer

A) four times the other's. 
B) two times the other's. 
C) the same as the other's. 
D) half the other's.

Question 15

Suppose you're on a Ferris wheel at a carnival,seated 10 m from the Ferris wheel's axis.If you make a complete rotation each minute,your linear speed is

Accepted Answer

A) 10 m/min. 
B) 31.4 m/min. 
C) 62.8 m/min. 
D) 100 m/min. 
E) Not enough information is given.

Question 16

What is the simulated gravitational field strength half-way between the axis of the Earth and the outside edge where the field strength is g?

Accepted Answer

A) zero 
B) g 
C) one-half g 
D) three-quarters g

Question 17

A swimming area in a rotating space habitat is located in a 1/4 g region.If a diver can jump 1 m high in a 1 g region,how high can the same diver jump in the swimming area?

Accepted Answer

A) 1 m 
B) 2 m 
C) 4 m 
D) 16 m 
E) more than 16 m

Question 18

A flywheel's mass is twice that of another of the same size and shape.The more massive flywheel's rotational inertia is

Accepted Answer