Podcast
Questions and Answers
What is the correct formula for the change in momentum of a body?
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?
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?
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?
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?
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.
