EASY
9th CBSE
IMPORTANT
Earn 100

Define the term ‘work’. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.

Important Questions on Work and Energy

EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Long Answer Type Questions>Q 52
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. g=9.8 m s-2
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Long Answer Type Questions>Q 53
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Long Answer Type Questions>Q 53
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Long Answer Type Questions>Q 54
What happens to the work done when the displacement of a body is at right angles to the direction of force acting on it? Explain your answer.
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Long Answer Type Questions>Q 54
A force of 50 N acts on a body and moves it a distance of 4 m on a horizontal surface. Calculate the work done if the direction of force is at an angle of 60o to the horizontal surface.
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Long Answer Type Questions>Q 55
Define the term ‘energy’ of a body. What is the SI unit of energy.
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Long Answer Type Questions>Q 55
What are the various forms of energy?
EASY
9th CBSE
IMPORTANT
Science for Ninth Class Part 1 Physics>Chapter 4 - Work and Energy>Long Answer Type Questions>Q 55
 Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.