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
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?
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?
Which of the following has the greatest kinetic energy?
(1) A 2 kg object moving at 3 m/s
(2) A 3 kg object moving at 2 m/s
(3) A 1 kg object moving at 4 m/s
(4) A 4 kg object at rest
Which of the following is an example of conversion of potential energy to kinetic energy?
(1) A stretched bow released
(2) A car at rest
(3) A book lying on a table
(4) A battery in a torch
Which of the following is an example of potential energy?
(1) A moving car
(2) Water stored in a dam
(3) A flying bird
(4) A rolling ball
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 possessed by a body due to its motion is called ________ energy.
Fill in the blank: The energy stored in food is called ________ energy.
Fill in the blank: The rate at which work is done is called ________.
Potential energy is the energy possessed by a body due to its ________ or position.
If a person pushes a wall and the wall does not move, is any work done?
State whether the following statement is true or false: The SI unit of work is Newton-meter.
State whether the following statement is true or false: Work done can be negative.
True or False: Energy can be created or destroyed.
