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 10
A 1 kg object falls freely from a height of 5 m. What is its speed just before hitting the ground? (Take g = 10 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 = 10 m/s².) What is its potential energy?
A car of mass 1000 kg is moving at 20 m/s. What is its kinetic energy?
A force of 10 N moves an object 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 4 m. Calculate the work done.
A machine does 500 J of work in 10 seconds. What is its power output?
A student lifts a 2 kg book from the floor to a shelf 1.5 m high. How much work is done against gravity? (Take g = 10 m/s²)
Define kinetic energy.
Explain the difference between kinetic energy and potential energy.
Explain why no work is done when you carry a bag and walk horizontally at constant speed.
If the angle between the force and displacement is 90°, what is the work done?
State the formula for calculating work when force and displacement are given.
State the law of conservation of energy.
State the principle of conservation of mechanical energy for a freely falling body.
What is the SI unit of power?
