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Acceleration and collision

1) You are playing an air hockey game where a puck glides frictionless on a cushion of air on a flat level table. When the puck is gliding across the table at constant velocity, which statement is true?

There are no forces acting on the puck
There is a force on the puck that causes it to continue to move forward.
The vector sum of the forces on the puck is zero.
The puck will slow down by itself.

2) The puck is moving towards you at 20m/s. You hit the puck, sending it in the opposite direction at 5m/s. The duration of time that you were hitting the puck was 0.05 seconds. The magnitude of the average acceleration of the puck was 0.05 seconds. The magnitude of the average acceleration of the puck while you were hitting it is, in m/s-seconds.

15
25
300
500
9.8

3) If the puck has a mass of m, and is accelerating with an acceleration of a, what statement must be true?

There is a force acing on the puck whose magnitude is equal to "ms".
The vector sum of al outside forces acting on the puck has a magnitude of "ma".
The puck is speeding up
The puck is slowing down.
The velocity of the puck is changing direction

4) When the puck hits the side of the table, its velocity changes from 7.07 m/s north to 7.07 m/s east. The collision with the wall lasts 0.08 seconds. In meters/second^2, what is the magnitude of the average acceleration of the puck during the collision?

0
125
177
88.4
none

5) During the same collision of the puck with the wall as in the previous question, what is the direction of the force of the wall on the puck?

North
East
South
West
Northeast
Southeast
Southwest
Northwest

6) For the same collision of the puck with the wall as in the previous questions, if the mass of the puck is 240grams, what is the magnitude of the average force of the wall o the puck during the collision.

0
30 newtons
42.5 newtons
9.8 newtons
2.35 newtons

7) Two pucks collide with each other on the air hockey table. Puck A has a mass of 240 grams, and puck B has a mass of 80 grams. During the collision, the magnitude of the force of puck A on puck B is?

1/3 the magnitude of the force of puck B on puck A
3 times the magnitude of the force of puck B on puck A
the same as the magnitude of the force of puck B on puck A
much greater than the force of puck B on puck A
zero

8) During the collision between puks A and B, the magnitude of the acceleration of puck A is:

1/3 the magnitude of the acceleration of puck B
3 times the magnitude of the acceleration of puck B
the same as the magnitude of the acceleration of puck B
unrelated to the magnitude of the acceleration of puck B
none of above

9) During the collision between pucks A and B the force of puck A on puck B is directed toward the north-east. During the collision, the direction of the force of puck B on puck A is directed toward the

North
South
East
West
Northeast
Southeast
Northwest
Southwest

10) Which statement is always true: a large boulder falls on a spider. The force of the boulder on the spider is....

Much larger than the force of the spider on the boulder
Much smaller than the force of the spider on the boulder
The same magnitude as the force of the spider on the boulder
Equal to the weight of the boulder
Equal to the mass times the acceleration of the spider

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