Advertisements
Advertisements
Question
On what factors does the work done by a force depend?
Advertisements
Solution
Work done depends upon:
(i) the magnitude and direction of the applied force, and
(ii) the displacement it produces.
APPEARS IN
RELATED QUESTIONS
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.
How many watts equal one horse power?
What do you understand by 'potential energy' and 'Kinetic energy'? Give three examples of each to illustrate your answer.
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
A girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s2, find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.
A force can cause an object to change its ______.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
