Work, Energy and power
ICSE · Class 10 · Physics
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What is the SI unit of work?
When a coolie moves on a platform carrying load on his head, the work done against gravity is:
What is the relationship between joule and erg?
Power is defined as:
Sample Questions
Which of the following are examples of kinetic energy?
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A moving car, A bullet fired from a gun, A rolling ball
Kinetic energy is possessed by objects in motion. A moving car, bullet fired from gun, and rolling ball all have kinetic energy. A book on shelf has potential energy due to height, and stretched rubber band has elastic potential energy.
The formula for kinetic energy is KE = ½mv².
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True
The formula for kinetic energy is indeed KE = ½mv², where m is mass and v is velocity of the object. This formula shows that kinetic energy depends on both mass and square of velocity.
Which forms of energy are types of mechanical energy?
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Kinetic energy, Potential energy
Mechanical energy consists of only two types: kinetic energy (due to motion) and potential energy (due to position or configuration). Heat, light, and chemical energy are other forms of energy.
When does work done become negative?
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When force opposes displacement
Work done is negative when force opposes displacement (θ = 180°). Examples include friction force and gravitational force on upward motion. When θ = 90°, work is zero, and when displacement is zero, work is also zero.
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