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प्रश्न
Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?
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उत्तर
Less effort is required because for a given height ‘h’ as longer is the length ‘l’ of the inclined plane, smaller is the angle of inclination, therefore, greater is the mechanical advantage, so lesser will be the effort required. As we know
Mechanical Advantage = l/h.
संबंधित प्रश्न
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
Power spent by a body depends on the time for which it does work.
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
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)
.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.
Can work done be zero even if force acts on the body?
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
