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
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.
State the formula for calculating work when force and displacement are given.
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?
Which of the following best describes mechanical energy?
(1) The sum of kinetic and potential energy
(2) Only kinetic energy
(3) Only potential energy
(4) The product of force and displacement
Which of the following equations represents the kinetic energy (KE) of a moving object?
(1) KE = 1/2 mv²
(2) KE = mgh
(3) KE = Fd
(4) KE = mg
Which of the following is an example of potential energy?
(1) A moving car
(2) Water stored in a dam
(3) A hot cup of tea
(4) A ringing bell
Which of the following is NOT a form of energy?
(1) Kinetic energy
(2) Potential energy
(3) Friction
(4) Chemical energy
Fill in the blank: The energy stored in a stretched rubber band is called ________ energy.
If a force acts perpendicular to the direction of motion, the work done is ________.
The potential energy of an object depends on its ________ and ________.
The SI unit of energy is ________.
If a person pushes a wall and the wall does not move, is any work done by the person on the wall?
State whether the following is true or false: Power is the rate at which work is done.
True or False: Energy can be created and destroyed.
True or False: Work done can be negative.
