CLASS - V
CHAPTER - FORCE AND ENERGY
QUESTION - ANSWER THESE QUESTIONS!!!
a. Briefly describe any three renewable energies.
b. Mention any two advantages and disadvantages of friction.
c. What do you understand by electrostatic force?
d. When do we say that work is done?
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Answers
Answered by
1
Answer:
A1 - The most popular renewable energy sources currently are:
Hydro energy. Tidal energy. Geothermal energy. Biomass energy
Answered by
2
Answer:
B) Advantage of friction
* It helps us walk on the ground.
* Brakes in a car make use of friction to stop the car.
Disadvantage of friction
* Friction produces unnecessary heat leading to the wastage of energy.
* The force of friction acts in the opposite direction of motion, so friction slows down the motion of moving objects.
C) The electrostatic force is an attractive and repulsive force between particles are caused due to their electric charges. The electric force between stationary charged body is conventionally known as the electrostatic force. It is also referred to as Columb’s force.
D) The work is said to be done when force is applied on an object moves through a distance in the direction of application of force.
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