Advertisements
Advertisements
Question
Define the term 'energy' of a body. What is the SI unit of energy.
Advertisements
Solution
Energy is the ability to do work. The amount of energy possessed by a body is equal to the amount of work it can do when its energy is released. It is a scalar quantity as it has only magnitude.
The SI unit of energy is Joule (J).
APPEARS IN
RELATED QUESTIONS
State the condition under which the mechanical energy is conserved.
State whether the object possess kinetic energy, potential energy, or both :
A flying aeroplane _______________.
State whether the object possess kinetic energy, potential energy, or both :
A stretched spring lying on the ground ____________.
What kind of energy is possessed by the following?
A compressed spring ____________.
Fill in the blank with suitable word :
The ability of a body to do work is called __________. The ability of a body to do work because of its motion is called __________.
What type of energy is possessed : by the stretched rubber strings of a catapult?
What kind of energy transformations take place at a coal-based thermal power station?
The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
Name the energy transfers which occur when :
an electric ball rings
A ball falls to the ground as shown below :
What is the kinetic energy of ball when it hits the ground?
