Class 9

WORK AND ENERGY question bank (Science)

Practice 233 free Class 9 Science - WORK AND ENERGY questions with answers and step-by-step solutions.

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Q1.

An object of mass $40\, kg$ is raised to a height of $5\, m$ above the ground. What is its potential energy? If the object is allowed to fall,find its kinetic energy when it is half-way down.

(A)
$1440\, J, 440\, J$
(B)
$1960\, J, 980\, J$
(C)
$1250\, J, 580\, J$
(D)
$1860\, J, 650\, J$
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Q2.

Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?

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