Advertisements
Advertisements
Question
If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force?
Advertisements
Solution
Work done in moving the body, (W) = 24.2 J
Distance travelled by the body, (S) = 0.2 m
We have a relation as,
`F = W/S`
Therefore ,
`F = 24.2/0.2` N
= 121 N
APPEARS IN
RELATED QUESTIONS
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Is power a scalar quantity?
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.

State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
What is the difference between renewable and non-renewable resources?
A block of mass 30 kg is pulled up a slope, as shown in diagram with a constant speed, by applying a force of 200 N parallel to slope.
A and B are initial and final positions of block.

(i) Calculate the work done by force in moving the block from A to B.
(ii) Calculate P.E. gained by block. [g=10ms-2]
A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.
