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Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
How many watts equal one horse power?
The work done on an object does not depend on ______.
Its moment of a force scalar or a vector quantity?
State the conditions of equilibrium for a rigid body.
Explain the difference between a uniform linear motion and a uniform circular motion.
Can every force produce work?
Complete the following sentences:
The SI unit of work is ....... and of power is .......
A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
Define the term work. Name the CGS and SI unit of work.
Give an example
Light energy changes to electrical energy.
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one
A force can cause an object to change its ______.
