EASY
9th Kerala Board
IMPORTANT
Earn 100

A boy is trying to push the concrete pillar of a building using a force of 300 N. Calculate the amount of work done by the boy.

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Important Questions on Work, Energy and Power

EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 2
From what you have learnt of potential energy and kinetic energy, write down the form of energy possessed by the water in a dam.
EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 2
From what you have learnt of potential energy and kinetic energy, write down the form of energy possessed by the stretched rubber band.
EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 2
From what you have learnt of potential energy and kinetic energy, write down the form of energy possessed by the mango falling down from a tree.
EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 3
Calculate the kinetic energy (in joules) of an athlete of mass 60 kg running with a velocity 10 m/s.
MEDIUM
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 4
A stone of mass 2 kg is thrown upwards from the ground with a velocity of 3 m/s. Calculate its potential energy (in joules) when it reaches maximum height. (Take g=10 m/s2).
EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 5
The heart of a healthy person beats 72 times per minute and each beat uses up about 1 J of energy. Calculate the power of the heart in watts.
EASY
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 6
Which among the following is a vector quantity?
MEDIUM
9th Kerala Board
IMPORTANT
Physics Standard IX Part 2>Chapter 5 - Work, Energy and Power>Let us assess>Q 7
If the velocity of an object is doubled, its kinetic energy becomes