Question
Explain by an example what is meant by potential energy. Write down the expression for gravitational potential energy of a body of mass m placed at a height h above the surface of the earth.
✓
Answer
Potential energy: The energy of a body due to its position or change in its shape is known as its potential energy.
Example: A stretched rubber has potential energy due to change in its shape and water in the overhead tank has potential energy due to its height above the ground.
PE = m × g × h
where, PE is the potential energy of the body.
m is the mass of the body.
g is the acceleration due to gravity.
h is the height above the surface of earth.
Example: A stretched rubber has potential energy due to change in its shape and water in the overhead tank has potential energy due to its height above the ground.
PE = m × g × h
where, PE is the potential energy of the body.
m is the mass of the body.
g is the acceleration due to gravity.
h is the height above the surface of earth.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A car weight 20000N climbs up a hill at a steady speed of 8 m/s, gaining a height of 120m in 100s. Calculate:
- Work done by the car.
- Power of engine of car.
What will happen if:
- Apical meristem is damaged or cut?
- Cork is not formed in older stems and roots.
- Lymph is not returned to blood?
If a car travels 50m distance in 4s with a acceleration of 5m/s2, then what was its initial speed?
Distinguish between loudness and intensity of sound.
Write a note on areolar tissue.
Distinguish between Nonchordata and Chordata.
What provisions are made by local authorities to provide clean drinking water?
Why lead compounds are added to petrol? How is it harmful?
A field with maize and soybean plants is shown here.
- What pattern of cropping does the field shows?
- Mention any two advantages of this type of cropping pattern.
A 150g ball, travelling at 30m/s, strikes the palm of a player’s hand and is stopped in 0.05 second. Find the force exerted by the ball on the hand.