Advertisements
Advertisements
प्रश्न
State the condition when the work done by a force is positive. Explain with the help of examples.
Advertisements
उत्तर
If the displacement of the body is in the direction of force, then work done is positive.
Hence, W= F × S
For example: A coolie does work on the load when he raises it up against the force of gravity. The force exerted by coolie (=mg) and displacement, both are in upward direction.
APPEARS IN
संबंधित प्रश्न
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.
Name two places in india where electricity is generated from nuclear power plants.
What is meant by a rotatory motion? Give one example.
What do you mean by equilibrium of a body?
What is a centripetal force?
How much force is applied on a body when 150 J of work is done in displacing the body through a distance of 10 m in the direction of the force?
State the condition when the work done by a force is negative. Explain with the help of examples.
What is the S.I. unit of work? Define it.
A coolie carries a load of 30 kgf through a distance of 500 m in 5 minutes while another coolie B carries the same load through the same distance in 10 minutes. Compare the
(i) work done, and
(ii) power developed. (Take: g = 10md−2)
