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 11
Define kinetic energy.
Describe the difference between work and energy.
Explain the law of conservation of energy.
Explain why work done by the centripetal force on an object in uniform circular motion is zero.
Which of the following best describes the work done by gravity on a satellite in a circular orbit?
(1) Positive
(2) Negative
(3) Zero
(4) Cannot be determined
Which of the following is a non-conservative force?
(1) Gravitational force
(2) Electrostatic force
(3) Frictional force
(4) Spring force
Which of the following is NOT a form of mechanical energy?
(1) Kinetic energy
(2) Potential energy
(3) Chemical energy
(4) Elastic potential energy
Which of the following is the correct expression for kinetic energy?
(1) mv
(2) 1/2 mv²
(3) mg
(4) mgh
Fill in the blank: The area under a force-displacement graph represents ________.
If the angle between the force and displacement is 90°, the work done is ________.
Potential energy due to gravity is given by the formula ________.
The SI unit of power is ________.
Is it possible for the total mechanical energy of a system to increase? Yes or No.
State whether the following statement is true or false: Power is the rate at which work is done.
True or False: Work is a scalar quantity.
Yes or No: Can the work done by friction ever be positive?
