Work and Energy — Important Questions
Maharashtra Board · Class 9 · Science
45 important questions from Work and Energy for Maharashtra Board Class 9 Science, with answers. Includes multiple choice and multiple correct questions.
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Important Questions from Work and Energy
When is work done said to be zero?
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When force and displacement are perpendicular, When there is no displacement
Work is zero when: 1) Force and displacement are perpendicular (θ = 90°), or 2) There is no displacement (s = 0).
Which factors affect kinetic energy?
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Mass of object, Velocity of object
Kinetic energy K.E. = ½mv² depends only on mass (m) and velocity (v) of the object.
The law of conservation of energy states that energy can be:
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Neither created nor destroyed
Energy can neither be created nor destroyed. It can only be transformed from one form to another.
When a ball is dropped from height, its potential energy:
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Decreases
As the ball falls, its height decreases, so potential energy (mgh) decreases and converts to kinetic energy.
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