Work, Energy and Power
Telangana Open School (TOSS) · Class 12 · Physics
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Quick Quiz: Work, Energy and Power
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Which of the following is a scalar quantity?
When a force acts perpendicular to the displacement, what is the work done?
What is the dimensional formula of work?
1 kilowatt-hour is equal to:
Sample Questions
Work done by a force is positive when:
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θ = 0°
When θ = 0°, cosθ = 1, so W = FS > 0, positive work.
The work done by gravity when a body is lifted upwards is:
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Negative
When lifting, displacement is upward, gravity downward, so θ = 180°, cos180° = -1, so W = -mgh.
Kinetic energy of a body depends on:
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Mass and velocity
Kinetic energy K = ½mv², so it depends on mass and velocity.
What is the unit of power?
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Watt
The SI unit of power is watt (W), which is joule per second.
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