Work, Energy and Power questions
712 published questions with worked solutions.
- When work done by a particle is positive,
- A body of mass 3 kg acted upon by a constant force is displaced by s metre, given by the relation s = t²/3, where t is in second....
- A body of mass 3 kg is under a force which causes a displacement in it given by s = t²/3 (in m). Find the work done by the force...
- A bullet fired from a gun with a velocity of 10⁴ ms⁻¹ goes through a bag full of straw. If the bullet loses half of its kinetic...
- A particle of mass 2 kg starts moving in a straight line with an initial velocity of 2 ms⁻¹ at a constant acceleration of 2 ms⁻²....
- A particle is released from a height S. At a certain height, its kinetic energy is three times its potential energy. The height...
- The potential energy of a certain spring when stretched through a distance s is 10 J. The amount of work done (in joule) that...
- If a man speeds up by 1 ms⁻¹, his KE increases by 44%. His original speed in ms⁻¹ is
- A box of mass 50 kg is pulled up on an incline 12 m long and 2 m high by a constant force of 100 N from rest. It acquires a...
- A car of mass 1000 kg moves at a constant speed of 20 ms⁻¹ up an incline. Assume that the frictional force is 200 N and that sinθ...
- Statement 1: Stopping distance = (Kinetic energy)/(Stopping force) Statement 2: Work done in stopping a body is equal to the KE...
- An engine accelerates a car of mass 800 kg from rest to a speed of 72 km h⁻¹ in 32 s. If the frictional force is 10 N per ton,...
- Work done by the force of friction
- If force is always perpendicular to motion,
- A man slowly pulls a bucket of water from a well of depth h = 20 m. The mass of the uniform rope and the bucket full of water are...
- The PE of a certain spring when stretched from its natural length through a distance 0.3 m is 5.6 J. Find the amount of work (in...
- A body of mass 10 kg at rest is acted upon simultaneously by two forces 4 N and 3 N at right angles to each other. The kinetic...
- A cord is used to lower vertically a block of mass M by a distance d with constant downward acceleration g/4. Work done by the...
- If the force and the displacement of a particle in the direction of the force are both doubled, work would be
- A particle of mass 100 g is thrown vertically upwards with a speed of 5 m/s. The work done by the force of gravity during the...
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