Work sheet (10) Chapter (9) Section (2) / Subject / Conservation momentum
Name / Date
Grade / 11-core / Cluster

I- Solve the following problems

1) A car of mass 700 kg and moving at speed of 30 m/s collides with a stationary truck of mass 1400 kg and the two vehicle lock together on impact. What is the combined velocity of the car and truck after the collision?

2) Two balls roll toward each other the red ball has a mass of 0.5kg and its velocity 4 m/s just before impact. the green ball has a mass of 0.3 kg and a speed of 2 m/s if the collision is perfectly inelastic ,determine the velocity of the composite object after the collision ?

3)A 1875-kg car going 23 m/s rear-ends a 1025-kg compact car going 17 m/s on ice in the same direction. The two cars stick together. How fast do the two cars move together immediately after the collision?

4) Car 1 with a mass of 1000 kg and a velocity of 20 m/s runs into the rear end of a larger car with mass of 2000 kg initially at rest. The two cars stick together.

A) Find the final velocity

B)  Find the energy lost in the collision

5) A 91.0-kg hockey player is skating on ice at 5.50 m/s. Another hockey player of equal mass, moving at 8.1 m/s in the same direction, hits him from behind. They slide off together.

a.  What are the total energy and momentum in the system before the collision?

b.  What is the velocity of the two hockey players after the collision?

c.  How much energy was lost in the collision?

7) Two balls roll toward each other .the red ball has amass of 0.6kg and a speed of 3m/s just before impact the black ball has a mass of 0.5kg and a speed of 2m/s after the head on collision the red ball continues forward with a speed of 2m/s .Find the speed of the black ball after the collision .was the collision elastic?

8) On a snow covered road a car with a mass of 1.1X103 kg collides head on with a van having a mass of

2.5 X103 kg travelling at 8 m/s as a result of the collision the vehicle lock together and immediately come to rest calculate the speed of car immediately before collision (neglect friction).

II- Answer the following question(s):

9) Compare and contrast between the three types of collision (elastic , inelastic & perfectly inelastic collision?

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