EASY
9th CBSE
IMPORTANT
Earn 100

When is work done by a force is negative?

Important Questions on Work and Energy

EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 1
When is work done by a force is zero?
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 2
Write the formula for the work done on an object when a force acts on the object in the direction of its displacement. Also, give the meaning of each symbol used in the formula.
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 3
A boy tries to push a truck parked on the roadside. The truck does not move at all. The same boy then pushes a bicycle. The bicycle moves through a certain distance. In which case, the work done was more : on the truck or on the bicycle. Explain, why?
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 4
What are the various forms of energy?
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 5
Define kinetic energy. Give some examples of bodies possessing kinetic energy.
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 6
On what factors does the kinetic energy of a body depend?
EASY
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 7
Two bodies having equal masses are moving with a uniform speed of v and 2v, respectively. Find the ratio of their kinetic energies.
MEDIUM
9th CBSE
IMPORTANT
Physics For Class 9>Chapter 4 - Work and Energy>Exercise>Q 8
How does the wind move the blades of a wind mill?