EASY
9th CBSE
IMPORTANT
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A stone kept at a certain height has the ability to do work due to its

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Important Questions on Work and Energy

EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 5 - Work and Energy>Check Your Progress>Q 4
If a body is taken from the equator to the south pole at the same height, its potential energy will
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 5 - Work and Energy>Check Your Progress>Q 5
A compressed spring can do work due to stored
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 5 - Work and Energy>Check Your Progress>Q 6

Give reasons for the following: After winding the spring of watch, the hands of the watch move.

EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 5 - Work and Energy>Check Your Progress>Q 6

Give reasons for the following: An arrow moves forward when released from the stretched bow.

EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 5 - Work and Energy>Check Your Progress>Q 7
An object of mass 1 kg has a potential energy of 20 J at a certain height above the ground. Find out the height of the object with respect to the ground. (take g=10 ms2 )
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 5 - Work and Energy>Check Your Progress>Q 8
 A rocket of mass 3×106 kg takes off from a launching pad and acquires a certain velocity at an altitude of 25 km. Calculate its potential energy.
EASY
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 5 - Work and Energy>Check Your Progress>Q 1
If you apply 1 J of energy to lift a book of 0.5 kg, how high will it rise? (take g=10 ms2)
MEDIUM
9th CBSE
IMPORTANT
LIVING SCIENCE PHYSICS 9>Chapter 5 - Work and Energy>Check Your Progress>Q 2
A boy of mass 50 kg climbs up a height of 100 m. Calculate the amount of work done by him. How much potential energy does he gain? (take g=10 ms2)