A wedge is made of two planes which are inclined and meet to form a sharp edge. This is used to split or cut things.

Match the following. Column A Column B a. Force i. Hydro electricity b. Flow water ii. Gravitational force c. Photosynthesis iii. Push or pull d. Earth's force iv. Frictional force e. Opposes motion v. Solar energy

a-iii The push or pull on an object is called force, and it changes its position or s hape. b-i The electricity produced by the energy of the flowing water is known as hydro electricity. Water that flows down a hill has enough energy to turn the huge turbines of the generators, to generate the electricity. c-v Sun's energy is also called solar energy. The sun is the main source of energy on earth. All green plants make use of the sun's energy to make food. d-ii The force with which the earth pulls all the objects downwards or towards itself is known as gravitational force. e-iv Frictional force is the force that opposes the movement of an object over another. This force is less on a smooth surface and more on rough surfaces. Column A Column B a. Force iii. Push or pull b. Flow water i. Hydroelectricity c. Photosynthesis v. Solar energy d. Earth's force ii. Gravitational force e. Opposes motion iv. Frictional force

E M B I B E

The Incredible SCIENCE 4.>Chapter 11 - Work, Force and Energy>Exercise>Q 4

EASY

4th CBSE

IMPORTANT

Earn 100

Define wedge.

Important Questions on Work, Force and Energy

MEDIUM

4th CBSE

IMPORTANT

The Incredible SCIENCE 4.>Chapter 11 - Work, Force and Energy>Exercise>Q 4

Why is the sun called the ultimate source of energy on the earth?

MEDIUM

4th CBSE

IMPORTANT

The Incredible SCIENCE 4.>Chapter 11 - Work, Force and Energy>THINK AND ANALYSE>Q a

Why do astronauts hop instead of walking on the moon?

MEDIUM

4th CBSE

IMPORTANT

The Incredible SCIENCE 4.>Chapter 11 - Work, Force and Energy>THINK AND ANALYSE>Q b

When you push a wall are you doing work? Why?

MEDIUM

4th CBSE

IMPORTANT

The Incredible SCIENCE 4.>Chapter 11 - Work, Force and Energy>THINK AND ANALYSE>Q c

Why do you slip while walking on snow or on stepping on a banana peel?

EASY

4th CBSE

IMPORTANT

The Incredible SCIENCE 4.>Chapter 11 - Work, Force and Energy>Worksheet 11>Q 1

Match the following.

Column A	Column B
a. Force	i. Hydro electricity
b. Flow water	ii. Gravitational force
c. Photosynthesis	iii. Push or pull
d. Earth's force	iv. Frictional force
e. Opposes motion	v. Solar energy