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प्रश्न
State and define the unit of force in the S.I. system.
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उत्तर
The unit of force in the S. I. system is Newton (N). Newton is defined as the force which, when applied on a body of mass 1 kg produces in it an acceleration of 1 ms2.
संबंधित प्रश्न
When does a force do work?
A body, when acted upon by a force of 10 kgf, gets displaced by 0.5 m. Calculate the work done by the force, when the displacement is (i) in the direction of force, (ii) at an angle of 60° with the force, and (iii) normal to the force. (g = 10 N kg-1)
A man spends 7.4 KJ energy in displacing a body by 74 m in the direction in which he applies force in 2.5 s. Calculate the force applied.
A body of mass m is moving with a uniform velocity u. A force is applied on the body due to which its velocity changes from u to v. How much work is being done by the force?
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
An engine does 54,000 J of work by exerting a force of 6000 N on it. What is the displacement in the direction of the force?
A man raises a box of mass 50 kg to a height of 2 m in 20 s, while another man raises the same box to the same height in 50 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
