Work and Energy Science - Work and Energy

Why is Energy not visible to us?

How is energy obtained from cooking gas?

In which form is energy stored in plant food?

How does a picture appear on the screen of a TV?

If we hold a convex lens over a sheet of paper in sunlight such that there is tiny spot of light on the paper for a while. What happens? Why?

We should use ……………….. energy resources with care. (conventional, non-conventional, both)

Plant stores the food in the form of ……………….. energy. (mechanical, light, chemical)

Heat is measured in unit called ……………….. . (kilometres, kilogram, calorie)

Falling water possesses ………………… energy. (potential, kinetic, chemical)

The capacity that an object has for doing work is called ………… . (energy, displacement, force)

State the energy conversions in following cases.

1. Solar water heater
2. Solar cell
3. Fission of uranium, thorium
4. Switch on mixer
5. Switch on lamp
6. Switch on TV
7. Switch on radio
8. Ram plays tabla
9. Ravi plays shehnai
10. You switch on the torch
11. Your mother lights the gas stove to cook
12. Dinesh is bursting crackers during Diwali

Methods of saving energy.

Save energy, (use alternative energy sources)

Energy is not visible to us.

Write Diffrerance between
Conventional and Non-conventional energy sources

Write Diffrerance between
Work and energy

Write Diffrerance between
Potential energy and Kinetic energy

(1) In the above activity, which are the different forces acting on the box?
(2) Is displacement possible without force?
(3) If force is applied to both the boxes is same, which box will be displaced more?
(4) If me e books are added to box, and same force is applied, will the displacement be more or less?
(5) If a force is applied with both the hands on a wall, will there be a displacement?
(6) If no displacement occurs on applying as force, what does it indicate?

Find out the types of energy from the following puzzle.