Work and Energy
Physics ⇒ Mechanics
Work and Energy starts at 8 and continues till grade 12.
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See sample questions for grade 12
A 0.5 kg ball is thrown vertically upwards with a speed of 10 m/s. What is its kinetic energy at the highest point? (g = 9.8 m/s²)
A 2 kg object is lifted to a height of 10 m. (Take g = 9.8 m/s².) What is the increase in its potential energy?
A 5 kg object falls from a height of 8 m. What is its speed just before hitting the ground? (g = 9.8 m/s²)
A 50 kg person runs up a flight of stairs 5 m high in 10 seconds. Calculate the power developed. (g = 9.8 m/s²)
A block slides down a frictionless incline of height 4 m. What is its speed at the bottom if it starts from rest? (g = 9.8 m/s²)
A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy?
A force of 10 N acts on a body and moves it 5 m in the direction of the force. Calculate the work done.
A force of 20 N acts at an angle of 60° to the direction of displacement of 3 m. Calculate the work done.
A machine does 500 J of work in 10 seconds. What is its power output?
A spring with force constant 200 N/m is compressed by 0.1 m. Calculate the potential energy stored in the spring.
Define a conservative force and give one example.
Describe the principle of conservation of mechanical energy with an example.
Explain the difference between kinetic energy and potential energy.
Explain why no work is done when you carry a bag horizontally at constant speed.
State the law of conservation of energy.
State the work-energy theorem.
