Work and Energy — Practice Quiz
Gujarat Board · Class 9 · Science
Try a 4-question quiz on Work and Energy for Gujarat Board Class 9 Science: tap an answer to check it and see why. 43 questions in the full chapter test.
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Quick Quiz: Work and Energy
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What are the two essential conditions for work to be done according to scientific definition?
The SI unit of work is:
If a force of 10 N moves an object through 5 m in the direction of force, the work done is:
Energy is defined as:
Sample Questions
Which of the following activities involve work being done according to scientific definition?
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Lifting a book from floor to table, Pushing a moving cart, Pulling a trolley that moves forward
Work is done when force acts and object moves. Lifting a book (force upward, book moves up), pushing a moving cart (force applied, cart moves), and pulling a trolley (force applied, trolley moves) all satisfy both conditions. Holding a bag stationary and studying involve no displacement.
The energy possessed by an object due to its motion is called:
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Kinetic energy
Kinetic energy is the energy possessed by an object due to its motion. Moving objects like a running car, flying bird, or flowing water have kinetic energy. Potential energy is due to position, heat and chemical energy are other forms.
The kinetic energy of an object depends on:
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Mass of the object, Velocity of the object
From the formula KE = ½mv², kinetic energy depends on mass (m) and velocity (v) of the object. It increases with both mass and velocity. Height affects potential energy, while color and temperature don't affect kinetic energy.
If the velocity of an object is doubled, its kinetic energy becomes:
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Four times
Since KE = ½mv², when velocity is doubled, KE = ½m(2v)² = ½m(4v²) = 4(½mv²). The kinetic energy becomes 4 times the original value because velocity is squared in the formula.
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