Advertisements
Advertisements
Question
State and define the unit of force in the S.I. system.
Advertisements
Solution
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.
RELATED QUESTIONS
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall
1) Name the force exerted by the table top
2) What is the direction of the force?
A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road.
Who does more work against the force of gravity and why?
How is the unit horsepower related to the S.I. unit of power?
What is meant by a rotatory motion? Give one example.
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes.
How much work each does? Take density of water = 103 kg m-3 and g = 9.8 N kg-1.
What is the work done by the gravitational force on the moon that revolves around the earth?
In the following case write yes, if the work is being done and no if no work is being done.
A man moving on the rough ground.
A coolie carrying a load on his head and moving on a frictionless horizontal platform does no work. Explain the reason why.
The world record for weight lifting was held by Sergei Didyk of the USSR. He lifted 261 kg to a height of 2.3 m in 4s; find:
(a) Weight lifted by him
(b) Work done by him
(c) Power developed by him. (g = 10m/s2)
