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

Questions
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

Answer: 18.75 N-m
2 The coefficient of restitution is 0 for a completely inelastic collision.
A True
B False

Answer: True
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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

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

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

Answer: 2.00
6 Coefficient of restitution of elastic bodies is ______
A One
B More than one
C Between 0 and one
D Zero

Answer: One
7 Kinetic energy before collision is always equal to the kinetic energy after collision.
A True
B False

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

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

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

Answer: 3.1

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