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Questions and Answers
What is the correct formula for the change in momentum of a body?
In a collision where a ball of mass 'm' strikes a rigid wall and rebounds back with the same speed, what is the impulse imparted to the ball by the wall?
If a particle moves in the x-y plane under the action of force F given by px = 2 cos t and py = 2 sin t, what is the angle θ between F and p at a given time t?
When the tension in the cable supporting an elevator is equal to the weight of the elevator, what is the elevator doing?
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For a car driver to avoid skidding on a flat curve of radius 150 m with coefficient of friction 0.6, what is the maximum velocity (in m/s) required?
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Study Notes
Motion and Friction
- The maximum velocity with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is 30 m/s.
Momentum and Force
- Change in momentum of a body is equal to force × time.
- Impulse imparted to a ball by a wall is -2mu when the ball strikes the wall with speed 'u' and rebounds back with the same speed.
Motion in x-y Plane
- A particle moves in the x-y plane under the action of force F, with linear momentum p at any instant t, where px = 2 cos t and py = 2 sin t.
- The angle θ between F and p at a given time t is 90°.
Elevators and Gravity
- If the tension in the cable supporting an elevator is equal to the weight of the elevator, the elevator may be going up with uniform speed.
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Description
Test your understanding of physics concepts with multiple-choice questions on circular motion, momentum, and impulse. Calculate the maximum velocity to avoid skidding on a flat curve, determine the change in momentum of a body, and find the impulse imparted to a ball striking a rigid wall.
