Machine Kinematics Questions and Answers – Loss of Kinetic Energy During Elastic Impact

1 A sphere of mass 25 Kg is moving at a speed of 1.5 m/s undergoes collision with another sphere of mass 50 Kg moving at 3m/s in the same direction, find the loss of kinetic energy when the collision is inelastic.

A 18.75 N-m

B 19.75 N-m

C 17.75 N-m

D 16.75 N-m

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Answer: 18.75 N-m

2 The coefficient of restitution is 0 for a completely inelastic collision.

A True

B False

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Answer: True

3 A sphere of mass 25 Kg is moving at a speed of 1.5 m/s undergoes collision with another sphere of mass 50 Kg moving at 3m/s in the same direction, find the loss of kinetic energy when the collision is inelastic with e = 0.6.

A 18.75 N-m

B 12.00 N-m

C 13.75 N-m

D 12.75 N-m

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Answer: 12.00 N-m

4 A sphere of mass 25 Kg is moving at a speed of 1.5 m/s undergoes collision with another sphere of mass 50 Kg moving at 3m/s in the same direction, find the common velocity in m/s after collision when the collision is completely inelastic.

A 2.5

B 9.75

C 7.25

D 6.75

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Answer: 2.5

5 A sphere of mass 25 Kg is moving at a speed of 1.5 m/s undergoes collision with another sphere of mass 50 Kg moving at 3m/s in the same direction, find the velocity of 50 Kg mass in m/s after collision when the collision is elastic.

A 2.5

B 2.00

C 7.25

D 6.75

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Answer: 2.00

6 Coefficient of restitution of elastic bodies is ______

A One

B More than one

C Between 0 and one

D Zero

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Answer: One

7 Kinetic energy before collision is always equal to the kinetic energy after collision.

A True

B False

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Answer: False

8 Which of the following cases has the greatest loss in Kinetic energy?

A e=0

B e=1/2

C e=1/4

D e=1

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Answer: e=0

9 A sphere of mass 25 Kg is moving at a speed of 1.5 m/s undergoes collision with another sphere of mass 50 Kg moving at 3m/s in the same direction, find the velocity of 25 Kg mass in m/s after collision when the collision is elastic.

A 2.5

B 2.00

C 3.5

D 6.75

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Answer: 3.5

10 A sphere of mass 25 Kg is moving at a speed of 1.5 m/s undergoes collision with another sphere of mass 50 Kg moving at 3m/s in the same direction, find the velocity of 25 Kg mass in m/s after collision when the collision is inelastic with e = 0.6.

A 2.5

B 2.00

C 3.5

D 3.1

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