Multiple Choice Test
Indicate the correct answer by clicking on the button next to the numbers 1, 2, 3 or 4. There is only one correct answer per question. After you have answered all multiple choice questions compare your choices with the correct answers.

Momentum

1.) A cricket ball of mass 'm' travelling at a speed of 'v', is struck back in the opposite direction with the same speed 'v'. The magnitude of the change in momentum of the ball is…

1 | 2 mv
2 | mv2
3 | mv
4 | 0

2.) A moving object X has a mass m and speed v. Another moving object Y will have twice the momentum of X if it has a mass and velocity of:

| mass | velocity
1 | 1/2 m | 1/2 v
2 | 1/2 m | 2 v
3 | 4 m | 1/2 v
4 | 4 m | 2 v

3.) A soccer ball of mass 1 kg strikes a wall at right angles with a velocity of 2 m/s as shown in the sketch. It bounces back with a velocity of 1,5 m/s.
The impulse of the wall on the ball (in kg.m/s) is ...

1 | 0,5 to the right
2 | 0,5 to the left
3 | 3,5 to the right
4 | 3,5 to the left

4.) Two trolleys A and B are moving towards another as shown in the diagram at the right. They collide and come to rest at the point of impact. From this observation we can conclude that the trolleys have …

1 | equal masses.
2 | were moving with equal and opposite momentum.
3 | were moving with equal and opposite velocities.
4 | were moving with equal kinetic energies.

5.) A snooker ball A moves at a velocity of 6 m/s and collides with two identical snooker balls B and C, as shown in the sketch. Ignore all friction.
After the collision …

1 | balls A and B are stationary and C moves at 6 m/s.
2 | balls A and B are stationary and C moves at 3 m/s.
3 | ball A is stationary and B and C move at 3 m/s.
4 | all three balls move at 2 m/s.

6.) The diagram at the right shows two blocks A and B, which are connected by a rubber band. The mass of A is twice the mass of B.
The two blocks are pulled apart on a smooth horizontal surface and released simultaneously. When they are released, the blocks collide and …

1 | both move to the right.
2 | both move to the left.
3 | both remain at rest.
4 | block A remains at rest and B moves to the right.

7.) Newton's second law of motion states:

1 | For every action there is an equal and opposite reaction.
2 | A body will remain at rest unless acted upon by an unbalanced force.
3 | The force acting on a body equals the rate of change of momentum.
4 | A body will move with uniform motion in a straight line, unless acted upon by an unbalanced force.

8.) Two vehicles move towards each other on a frictionless road as shown in the sketch below. The two cars collide and immediately come to a standstill.

During the collision, the total momentum of the two vehicles will …

1 | decrease.
2 | stay constant.
3 | firstly increase and then decrease.
4 | firstly decrease and then increase.

9.) An open truck is moving horizontally with a constant velocity along a frictionless track underneath a grain bin. Grain, falling vertically down, now starts falling into the truck, partly filling it as it moves along. What will happen to the momentum of the truck accumulating grain?

1 | It will decrease.
2 | It will increase.
3 | It will first increase and then decrease.
4 | It will stay the same.

10.) Two trolleys, X and Y, of masses 4 kg and 6 kg respectively, are held stationary on a horizontal surface with a spring compressed between them. Two barriers are situated equidistant from each trolley as shown in the diagram below.

When the spring is released …

1 | trolley X will strike the barriers first.
2 | trolley Y will strike the barrier first.
3 | both trolleys will strike the barrier at the same time.
4 | the final momentum is zero and therefore the trolleys will not reach the barrier.

Results

Hint: You can do the test offline as well. Just click "file" from the menu, then "save" to a destination of your choice. But remember to open file either with windows explorer or internet explorer. Netscape might not be able to reload pictures offline.

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