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 11
A 1 kg ball is thrown vertically upwards with a speed of 10 m/s. What is its maximum height? (Take g = 9.8 m/s²)
A 10 kg object is dropped from a height of 20 m. What is its speed just before hitting the ground? (Ignore air resistance, g = 9.8 m/s²)
A 2 kg object is moving at 3 m/s. Calculate its kinetic energy.
A ball of mass 0.5 kg is raised to a height of 10 m. (Take g = 9.8 m/s².) What is its gravitational potential energy at that height?
A car of mass 1000 kg increases its speed from 10 m/s to 20 m/s. Calculate the increase in its kinetic energy.
A force of 15 N acts at an angle of 60° to the direction of displacement of 4 m. Calculate the work done.
A machine does 500 J of work in 10 seconds. What is its power output?
A spring with a spring constant of 200 N/m is compressed by 0.1 m. Calculate the elastic potential energy stored in the spring.
Define kinetic energy.
Describe the difference between work and energy.
Explain the law of conservation of energy.
Explain why work done by the centripetal force on an object in uniform circular motion is zero.
If a force of 10 N acts on a body and moves it 5 m in the direction of the force, what is the work done?
State the principle of conservation of mechanical energy for a freely falling body.
State the work-energy theorem.
