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Write the formula for work done on a bod...

Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.

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(a) Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula. (b) A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. ( g = 9.8 m s^(-2) )

Work is always done on a body when

(a) When do we say that work is done ? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it. (b) How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?

How is work done measured when, The force is inclined to the direction of motion of the body?

The work done by a body is the product of force and :

How is work done measured when, The force acts along the direction of motion of the body

No work is said to have been done when an object moves at an angle of _____ with the direction of the force.

A force of 20 N acts on a body and the body moves through 1 m at an angle of 45^(@) in the direction of the force. The work done by the force is

(a) What happens to the work done when the displacement of a body is at right angles to the direction of force acting on it ? Explain your answer. (b) A force of 50 N acts on a body and moves it a distance of 4 m on a horizontal surface. Calculate the work done if the direction of force is at an angle of 60^(@) to the horizontal surface.

Write the formula to calculate the speed of a body moving along a circular path. Give the meaning of each symbol which occurs in it.

LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. Is it possible that a force is acting on a body but still the work don...

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  2. A boy throws a rubber ball vertically upwards. What type of work, posi...

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  3. Write the formula for work done on a body when the body moves at an an...

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  4. How does the kinetic energy of a moving body depend on its (i) speed, ...

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  5. What is meant by positive work, negative work and zero work ? Illustra...

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  6. A ball of mass 200 g falls from a height 5 metres. What is its kinetic...

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  7. Find the momentum of a body of mass 100 g having a kinetic energy of 2...

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  8. Two objects having equal masses are moving with uniform velocities of ...

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  9. A body of 2 kg falls from rest. What will be its kinetic energy during...

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  10. On a level road, a scooterist applies brakes to slow down from a speed...

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  11. A man drops a 10 kg rock from the top of a 5 m ladder. What is its spe...

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  12. Calculate the work done by the brakes of a car of mass 1000 kg when it...

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  13. A body of mass 100 kg is lifted up by 10 m. Find : (i) the amount of...

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  14. A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate t...

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  15. What is the work done by a constant force ? When is it positive, negat...

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  16. To what height should a box of mass 150 kg be lifted, so that its pote...

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  17. A body of mass 2 kg is thrown vertically upwards with an initial veloc...

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  18. How much work is done when a force of 1 N moves a body through a dista...

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  19. A car is being driven by a force of 2.5 xx 10^(10) N. Travelling at a...

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  20. Explain by a an example that a body may possess energy when it is not ...

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