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Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
Work done = Force × ........................................
Explain degradation of energy by taking two examples of your daily life.
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
Complete the following sentences:
1 H.P. = ........ W.
A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him?
