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In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
State two advantage of producing hydroelectricity.
What are the quantities on which the amount of work done depends? How are they related to work?
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
Its moment of a force scalar or a vector quantity?
How many joules are there in 1 mega joule?
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.
