Advertisements
Advertisements
Question
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
Advertisements
Solution
Energy is defined as the capacity of a body to do work. Energy is a scalar quantity. The energy possessed by a body is measured by the amount of work done by a body while changing its state of rest or state of motion.
RELATED QUESTIONS
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.
Complete the following sentences:
The SI unit of work is ....... and of power is .......
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
A water pump raises 50 kg of water through a height of 25 m in 5s. Calculate the power supplied by the pump (Take: g = 10 N kg−1).
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A green plant is carrying out photosynthesis.
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
