Advertisements
Advertisements
प्रश्न
What do you mean by conservation of mechanical energy? State the condition when does it hold.
उत्तर
This means “The total MECHANICAL ENERGY (P.E + K.E) of an isolated system at any instant is equal to the sum of kinetic ENERGYand the potential ENERGY.”
Condition : Condition under which the mechanical energy is conserved is “WHEN THERE ARE NO FRICTIONAL FORCES.” In other words the mechanical energy is conserved strictly in vacuum where friction due to air is absent.
APPEARS IN
संबंधित प्रश्न
Write true or false of the following statement.
One form of energy cannot be converted into another form.
Fill in the blank
The ability to do work is called ______
Select the correct alternatives
When a bulb lights up on passing current, the change of energy is
State the unit of energy and define it.
What is potential energy ? State its unit.
How many joules are there in one kilowatt-hour?
A certain household consumes 650 units of electricity in a month. How much is this electricity in joules?
The commercial unit of energy is :
Can you tell?
What should be taken into account for measuring work?
Observe the picture and put a tick (✓) if work is done and put a cross (x) if work is not done.
 |
 |
 |
 |
 |
 |
