Advertisements
Advertisements
Question
Give reasons for the following. No work is done if a man is pushing against a wall.
Advertisements
Solution
As the wall does not move from its place, the distance moved is zero. Hence, no work is done.
APPEARS IN
RELATED QUESTIONS
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
Define 1 joule of work.
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Explain the difference between a uniform linear motion and a uniform circular motion.
What is the work done when the object acted upon by a force remains at rest?
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
Give an example
Light energy changes to electrical energy.
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one.
If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)
