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Energy Numericals

The document contains a series of numerical problems related to work, energy, and gravitational potential energy. It includes calculations for work done by forces, potential energy at various heights, and kinetic energy for moving bodies. Each problem is accompanied by specific data and expected answers for educational purposes.

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Tuhina Rahul Sinha
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8 views1 page

Energy Numericals

The document contains a series of numerical problems related to work, energy, and gravitational potential energy. It includes calculations for work done by forces, potential energy at various heights, and kinetic energy for moving bodies. Each problem is accompanied by specific data and expected answers for educational purposes.

Uploaded by

Tuhina Rahul Sinha
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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RADIATION CLASSES

WORK AND ENERGY


NUMERICALS
1. A force of 50 N acts on a body and moves it through a distance of 10 m in the direction of force. Calculate the work done by the force.

2. A man lifts a mass of 30 kg to a height of 5 m. Assuming that the force of gravity on 1 kg mass is 10 N, find the work done by the man.

3. A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take
1 kgf = 10 N.

4. Two bodies of same masses are placed at heights h and 2h. Compare their gravitational potential energy.

5. Find the gravitational potential energy of 2.5 kg mass kept at a height of 15 m above the ground. The force of gravity on mass 1 kg is
10 N.

6. The gravitational potential energy stored in a box of weight 150 kgf is 1.5 x 104 . Find the height of the box. Take 1 kgf = 10 N

7. The potential energy of a body of mass 0.5 kg increases by 100 J when it is taken to the top of a tower from ground. If force of gravity
on 1 kg is 10 N, what is the height of the tower?

8. A body of mass 60 kg is moving with a speed 50 m/s. Find its kinetic energy.

ANS. 7.5 X 104 J

9. A truck of mass 1000 kg, increases its speed from 36 km h-1 to 72 km h-1. Find the increase is its kinetic energy.

ANS. 150000 J

10. A car is moving with a speed of 15 km h-1 and another identical car is moving with a speed of 30 km h -1. Compare their kinetic energy.

ANS. 1:4

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