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 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.
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?
Which of the following has the greatest potential energy?
(1) A ball at the top of a hill
(2) A ball at the bottom of a hill
(3) A ball rolling down a hill
(4) A ball at rest on flat ground
Which of the following is a correct statement about work and energy?
(1) Work and energy have different units
(2) Work and energy are both measured in Joules
(3) Work is always greater than energy
(4) Energy is always less than work
Which of the following is an example of energy transformation?
(1) A battery powering a flashlight
(2) A book lying on a table
(3) A stationary car
(4) A closed box
Which of the following is an example of potential energy being converted to kinetic energy?
(1) A stretched bow releasing an arrow
(2) A car parked on a hill
(3) A book on a shelf
(4) A person sitting still
Energy can neither be created nor destroyed. This statement is known as the law of ________.
Fill in the blank: The rate at which work is done is called ________.
If no external force acts on a system, the total energy of the system remains ________.
Potential energy due to an object’s position above the ground is called ________ potential energy.
If a force acts perpendicular to the direction of motion, is any work done?
True or False: If you push against a wall and it does not move, you have done work on the wall.
True or False: Kinetic energy depends on both the mass and the speed of an object.
True or False: The energy stored in food is chemical energy.
