Topic: Engineering Mechanics
Which of the following is NOT true?
- A. For direct impact of two bodies, coefficient of restitution is the ratio of relative velocity of approach to their relative velocity of separation
- B. Conservation of angular momentum implies that total angular momentum remains constant unless acted on by an external torque
- C. Conservation of linear momentum implies that the sum of external forces in that direction is zero
- D. The coefficient of friction is independent of area of contact
Answer: A. For direct impact of two bodies, coefficient of restitution is the ratio of relative velocity of approach to their relative velocity of separation
Explanation: The coefficient of restitution is the ratio of the relative velocity of separation to the relative velocity of approach, not the other way around.