Physicshard · Past Paper
What is the work done by friction on a body of mass m sliding down an inclined plane of length L and inclination angle theta?
AmgL sin(theta)
Bu mgL cos(theta)
C- u mgL cos(theta)
DZero
✓ Correct Answer: C — - u mgL cos(theta)
Friction force f = uN = u mg cos(theta). Work = -fL = -u mgL cos(theta). The negative sign indicates it opposes motion.
Share this question
More from Physics
- When we step on a gas pedal of a car, chemical energy of fuel is primarily converted into:
- When we wind a watch, we store:
- A body thrown vertically upwards reaches its maximum height. At this point, its velocity is:
- A weightlifter holds a 100 kg weight over his head for 10 seconds. Work done by him during these 10 seconds is:
- A 100 Watt bulb is used for 10 hours daily. How many 'units' of electricity does it consume in one day?