HARD
9th CBSE
IMPORTANT
Earn 100

The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.

Important Questions on Work and Energy

MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 16
What do you mean by gravitational potential energy? Show that gravitational potential energy is independent of the path followed.
HARD
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 17
How does energy varies in a an oscillating pendulum? Express how many times potential energy and kinetic energy attain maximum in an oscillation?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 18
A mass m is dropped from a height hat half-way to the ground, what is the total energy?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 18
What happens to the work done by you, as you hit a football?
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 18
Write the relation between power, energy and time.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 19
When water is flowing through a pipe, then its velocity changes by 5% find the change in percentage, in the power water.
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 20
A boy of mass 50 kg runs up a staircase of 50 steps in 10 s. if the height of each step is 15 cm, then find the his power. (take,g=10ms-2)
MEDIUM
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 21
A geyser of 2.5 kw is used for 6 h daily. Calculate the cost of electricity consumed in 10 days. Electricity rate per unit ₹ 4.