A 10 kg brick and a 1 kg brick are dropped in a vacuum. The force of gravity on the 10 kg brick is

1.   ?    10 times as much as the force on the 1 kg brick.
2.   ?    zero.
3.   ?    the same as the force on the 1 kg brick.

An apple weighs 1 N. When held at rest above your head, the net force on the apple is

1.   ?    0 N.
2.   ?    0.1 N
3.   ?    1 N
4.   ?    9.8 N

The maximum acceleration of a car while towing a second car twice its mass, compared to no towing, is

1.   ?    one forth.
2.   ?    the same.
3.   ?    one half.
4.   ?    one third.
5.   ?    none of these.

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s/s. What is the mass of the car?

1.   ?    500 kg
2.   ?    1000 kg
3.   ?    1500 kg
4.   ?    3000 kg
5.   ?    none of these.

If the mass of an object does not change, a constant net force on the object produces constant

1.   ?    velocity.
2.   ?    acceleration.
3.   ?    both of these.
4.   ?    none of these.

An object following a straight line path at constant speed

1.   ?    has no forces acting on it.
2.   ?    must be moving in a vacuum or in the absence of air drag.
3.   ?    has zero acceleration.
4.   ?    has a net force acting upon it in the direction of motion.

A rocket becomes progressively easier to accelerate as it travels upward from the ground mainly because

1.   ?    the mass of the rocket decreases as the fuel is burned.
2.   ?    gravity becomes weaker with increased distance.
3.   ?    The applied force on the rocket increases as burning of fuel progresses.

A skydiver of mass 100 kg experiences air resistance of 500 N, and an acceleration of about... (remember a g is a 9.8 m/s/s)

1.   ?    0.2 g.
2.   ?    0.3 g.
3.   ?    0.4 g.
4.   ?    0.5 g.
5.   ?    more than 0.5 g.

A 55 kg piece of metal falls from an airplane 2000 m high. By the time the piece falls 900 m it is experiencing a force of resistance of 539 N. What is its acceleration in m/s/s?

1.   ?    0.
2.   ?    10.2
3.   ?    9.8
4.   ?    16.3
5.   ?    3.7

An archer shoots an arrow. Consider the action force to be exerted by the bowstring against the arrow. The reaction to this force is the

1.   ?    grip of the archer's hand on the bow.
2.   ?    arrow's push against the bowstring.
3.   ?    air resistance against the bow.
4.   ?    friction of the ground against the archer's feet.
5.   ?    weight of the arrow.

Two 10 Newton weights are pulling on the spring scale as shown. The reading on the scale is

1.   ?    10 N
2.   ?    20 N
3.   ?    0 N

Joe pushes Bill, who is asleep. Bill

1.   ?    does not push Bill.
2.   ?    will eventually push Joe when he awakes.
3.   ?    pushes Joe, but not as hard.
4.   ?    pushes Joe equally hard.

A golf ball of mass 60 grams is struck by a golf club and acquires a speed of 70 m/s during the impact, which lasts .0002 seconds. What force (assumed constant) is exerted on the object?

1.   ?    21,000,000 N
2.   ?    21,000 N
3.   ?    21 N
4.   ?    .00021 N

What average force is required to stop a 1000 kg car in 6.0 seconds if it is traveling at 90 km/hr?

1.   ?    -11,327.4 N
2.   ?    13,500 N
3.   ?    -4166.7 N
4.   ?    15,000 N

A large 430 kg crate breaks loose on a loading dock and slides down the ramp that is 35 degrees with the horizontal. The coefficient of friction on this ramp is .36. With what acceleration does the crate slide down?

1.   ?    5.62 m/s/s
2.   ?    2.09 m/s/s
3.   ?    .277 m/s/s
4.   ?    2.73 m/s/s

A heavyweight boxer slugs a piece of paper hanging from a string. The paper weighs 0.0784 N and is accelerated to a speed of 45 m/s in a distance of 22.5 cm. What massive force did the boxer apply to the paper? What is odd about the size of this force?

1.   ?    36 N
2.   ?    352.8 N
3.   ?    .36 N
4.   ?    .0784 N

A man mows his yard which is very hilly. One hill has an incline of 21 degrees with the horizontal. The 17 kg mower makes an angle of 40 degrees with the hill itself. The coefficient of friction on the slope is .25. The man pushes with 200 N of force. With what acceleration does the mower go up the hill. (see diagram).

If a non-rotating object has no acceleration, then we can say for certain that it is

1.   ?    in equilibrium
2.   ?    moving at constant non-zero velocity
3.   ?    at rest
4.   ?    all of these
5.   ?    none of these

Neglecting Friction, a large block of ice and a small block of ice start sliding down an incline together. The heavier block will get to the bottom

1.   ?    at the same time as the light block.
2.   ?    before the light block.
3.   ?    after the light block.

A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is

1.   ?    its weight.
2.   ?    less than its weight.
3.   ?    more than its weight.

The brakes of a speeding truck are slammed on and it skids to a stop. If the truck were heavily loaded so that it had twice the total mass, the skidding distance would be

1.   ?    1/2 as far.
2.   ?    1 1/2 as far.
3.   ?    2 times as far.
4.   ?    4 times as far.
5.   ?    the same.

Two people, one twice as massive as the other, attempt a tug-of-war with 12 meters of rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of

1.   ?    3m
2.   ?    4m
3.   ?    5m
4.   ?    6m