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 9
A 1.5 kg object is moving at 4 m/s. Calculate its kinetic energy.
A 10 kg object is dropped from a height of 10 m. (Take g = 10 m/s²) What is its potential energy just before it hits the ground?
A 2 kg object is lifted to a height of 5 m. (Take g = 10 m/s²) What is its potential energy?
A 2 kg object is moving at 3 m/s. What is its kinetic energy?
A 50 kg person climbs a staircase of height 4 m. (Take g = 9.8 m/s²) Calculate the increase in potential energy.
A ball of mass 0.5 kg is moving with a speed of 2 m/s. Calculate its kinetic energy.
A box is pulled 8 m across a floor by a force of 15 N. How much work is done?
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?
Describe what happens to the kinetic and potential energy of a ball thrown vertically upwards as it rises.
Explain the difference between kinetic energy and potential energy.
Explain why no work is done when you carry a bag horizontally at constant speed.
If the angle between force and displacement is 90°, what is the work done?
State the formula for calculating work when force and displacement are given.
State the formula for gravitational potential energy.
State the law of conservation of energy.
State the work-energy theorem.
What is the formula for kinetic energy?
What is the SI unit of power?
