# Classical Mechanics on Objects

1. A ball is thrown up in the air. It goes up and then eventually comes down again. On its way up (after being let go), which is correct?

A. Its acceleration decreases

B. Its acceleration increases

C. Its accelerations stays pretty much the same

D. Impossible to stay unless the ball,s mass is known

E. Impossible to stay unless its direction relative to the horizontal is known.

2. Right Now you are at rest on a chair. Ignoring the rotation and orbit of the earth, what is your acceleration?

A. zero

B. 9.8m/s

C. 9.8m/s^2

D. 9.8N

E. 9.8J

3. A Box is at rest on a frictionless surface. These forces are exerted on the box such that the box remains at rest. One is a force toward the North. Another is a force of 10 N Toward the East. What is the third force? Support Your answer?

A 20N toward the Northeast.

B. 20 N toward the Southwest

C. 14 N toward the Northeast

D. 14 N toward the Southwest

E. Impossible to say without knowing the mass of the block.

4. A woman exerts the a constant horizontal force on a large box. As a result, the box moves across a horizontal floor at a constant speed "v0". The constant horizontal force applied by the woman:

A. has the same magnitude as the weight of the box

B. is greater than the weight of the box

C. has the same magnitude as the total force which resists the motion of the box

D. is greater than either the weight of the box or the total force which resists its motion.

5. A ball rolls of a horizontal 1-m high table with an intial speed of 1m/s. It then takes about 0.5 seconds to fall to the floor. As it falls to the floor (i.e. while the ball is in the air), the horizontal component of the ball's velocity

A. remains roughly constant at about 0m/s

B. remains roughly constant at about 1m/s

C. decreases steadily from 1m/s to about 0m/s

D. increases steadily from 0m/s to about 5m/s

E. None of the above

6.) A large truck collides head-on with a small compact car. During the collision:

A.) The truck exerts a greater amount of force on the car, than the car exerts on the truck.

B.) The car exerts a greater amount of force on the truck, than the truck exerts on the car

C.) Neither exerts a force on the car but the car gets smashed simply because it gets in the way of the truck.

D.) The truck exerts a force on the car but the car does not exert a force on the truck.

E.) The truck exerts the same amount of force on the car as the car exerts on the truck.

7.) Two metal balls are the same size but one weighs twice as much as the other. The balls are dropped from the same height at the same time In this situation:

A. both balls hit the floor at approximately the same time

B. the heavier ball takes twice as long to fall than does the lighter ball.

C. The lighter ball takes twice as long to fall than does the heavier ball

D. The heavier ball takes considerably longer to fall than does the lighter ball, but not necessarily twice as long.

E. The lighter ball takes considerably longer to fall than does the heavier ball, nut not necessarily twice as long

8) Two metal balls are the same size but one weights twice as much as the other. The balls are dropped from the same height at the same time. As they fall:

a.) the net force on each ball is approximately the same.

b.) The net force on the heavier ball is about twice that on the lighter ball.

c.) The net force of the lighter ball is about twice than on the heavier ball.

d.) The net force on the heavier ball is considerably more than on the lighter ball, but not necessarily twice as much.

e.) The net force on the lighter ball is considerably more than on the heavier ball, but not necessarily twice as much.

9.) A ball is thrown up in the air. It goes up and then eventually comes down again. On its way up (after being let go) which is correct?

a.) Its acceleration decreases

b.) Its acceleration increases

c.) Its acceleration stays pretty much the same

d.) Impossible to say unless the ball's mass is known.

e.) Impossible to say unless its direction relative to the horizontal is known.

10) While the car still pushing the truck is speeding up to get up to cruising speed:

a.) The amount of force with which the car pushes on the truck is equal to that with which the truck pushes back on the car.

b.) The amount of force with which the car pushes on the truck is smaller than that with which the truck pushes back on the car.

c.) The amount of force with which the car pushes on the truck is greater than that with which the truck pushes back on the car.

d.) The car's engine is not running so that the truck cannot push back against the car. The truck is pushed forward simply because it is in the way of the car.

e.) Neither the car nor the truck exerts any force on the other. The truck is pushed forward simply because it is in the way of the car.

11. A ball is thrown up in the air. It goes up and then eventually comes down again. On its way up (after being let go), which is correct?

A. Its acceleration decreases

B. Its acceleration increases

C. Its accelerations stays pretty much the same

D. Impossible to stay unless the ball,s mass is known

E. Impossible to stay unless its direction relative to the horizontal is known.

12. Right Now your are at rest on a chair. Ignoring the rotation and orbit of the earth, what is your acceleration?

F. zero

G. 9.8m/s

H. 9.8m/s^2

I. 9.8N

J. 9.8J

See attached file for full problem description.

#### Solution Summary

The file contains the answers with full explanations of 10 multiple choice questions based on the basics concepts of mechanics and laws of motion.