When is work done by a force zero?

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 10

Which will have more impact on kinetic energy-doubling mass or velocity?

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 11

Where is work done by pendulum have maximum potential energy?

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 11

Where is work done by pendulum having maximum kinetic energy?

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 12

A man of $50 \mathrm{kg}$ jumps to height of $3 \mathrm{m}$. What is the maximum potential energy that he will have? (Take $g=10 \mathrm{m}/{\mathrm{s}}^2$)

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 13

Find the energy in $\mathrm{kWh}$ consumed in $10 \mathrm{h}$ by a machine of power $500 \mathrm{w}$.

MEDIUM

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 14

How many joules of energy are consumed by a $1000 \mathrm{W}$ heater used for $2\mathrm{h}$?

HARD

9th CBSE

IMPORTANT

All In One SCIENCE CBSE Class IX>Chapter 11 - Work and Energy>CHAPTER EXERCISE>Q 15

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.

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.