Advertisements
Advertisements
Question
State two factors on which the potential energy of a body at a certain height above the ground depends.
Solution
The potential energy of a body in the raised position depends upon the following two factors:
(a) The mass of the body: Greater the mass of the body, greater is the potential energy of the body.
(b) Its height above the ground: Higher the height of the body, greater is its potential.
APPEARS IN
RELATED QUESTIONS
Write true or false of the following statement.
In an electric fan, electrical energy changes into the mechanical energy.
What do you mean by conservation of mechanical energy? State the condition when does it hold.
Define the term efficiency of a machine.
Tick the most appropriate answer.
The force applied on a machine to do work is called the
A cell converts one form of energy into another form. Name the two forms.
Derive the relation between commercial unit of energy (kWh) and SI unit of energy (joule).
The commercial unit of energy is :
- Take two aluminium channels of different lengths.
- Place the lower ends of the channels on the floor and hold their upper ends at the same height.
- Now take two balls of the same size and weight and release them from the top end of the channels. They will roll down and cover the same distance.
- At the moment of releasing the balls, which energy do the balls have?
- As the balls roll down which energy is converted into which other form of energy?
- Why do the balls cover the same distance on rolling down?
Note: The question is wrong. It should be "Why do the balls cover the same distance after rolling down"? - What is the form of the eventual total energy of the balls?
- Which law related to energy does the above activity demonstrate? Explain.
Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.
 |
 |
 |
 |
 |
 |
When a body falls freely towards the earth, then its total energy
