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 8
A 2 kg ball is moving at 3 m/s. What is its kinetic energy?
A 3 kg object is at a height of 4 m. (Take g = 10 m/s2). What is its gravitational potential energy?
A 4 kg object is moving at 2 m/s. Calculate its kinetic energy.
A 5 kg object is lifted to a height of 2 m. (Take g = 10 m/s2). What is its gravitational potential energy?
A force of 10 N moves an object 5 m in the direction of the force. Calculate the work done.
A machine does 200 J of work in 10 seconds. What is its power output?
A person lifts a 10 kg object to a height of 1.5 m. (Take g = 9.8 m/s2). What is the potential energy gained by the object?
A person pushes a box with a force of 20 N over a distance of 3 m at an angle of 0° to the direction of motion. Calculate the work done.
A spring is compressed. What type of energy is stored in the spring?
Describe what is meant by mechanical energy.
Explain the difference between kinetic energy and potential energy.
Explain what happens to the energy of a ball as it falls freely from a height.
Explain why no work is done when you carry a bag at a constant speed in a straight line.
If the angle between the force and displacement is 90°, what is the work done?
State the formula for gravitational potential energy.
State the formula for work done when a constant force acts on an object and causes displacement.
State the SI unit of power.
Write the formula for kinetic energy.
A 2 kg object is moving with a velocity of 5 m/s. If its velocity is doubled, by what factor does its kinetic energy change?
A 50 W electric bulb is used for 2 hours. How much energy does it consume in Joules?
