Match the correct answer: a. Gravitational force i. Nails attracted by a lodestone b. Friction force ii. Motion of Earth around the sun c. Magnetic force iii. Horse pulling a cart d. Electrostatic force iv. A ball rolling on the floor e. Muscular force v. An electron repelled by another electron

a. Gravitational force - ii. Motion of Earth around Sun Gravitational force is an attractive force that depends upon the mass of interacting objects. The force responsible for the motion of the Earth around the Sun is the gravitational force. b. Frictional force - iv. A ball rolling on the floor. Friction force is a force that acts on a moving object in a direction opposite to that of the motion and thus opposes the motion. A ball rolling on the floor have a frictional force acting on it, which eventually stops it. c. Magnetic force - i. Nails attracted by a lodestone. The attraction of nails by a lodestone is an example of a magnetic force in action. The forces acted by a magnetic material are called magnetic forces. Poles are the areas of the strongest magnetism in a magnet. d. Electrostatic force - v. An electron repelled by another electron. The force that acts between the two charges lying at rest is called an electrostatic force. The electrostatic force is responsible for the repulsion of electrons, as like charges repel each other. e. Muscular force - iii. A horse pulling a cart. The force that comes from the action of muscles is called the muscular force. A horse applies muscular force on the cart to pull the cart. Human beings can also exert muscular force. It is a contact force, as the interacting objects are far away from each other, it cannot act. a. Gravitational force ii. Motion of Earth around the sun b. Friction force iv. A ball rolling on the floor c. Magnetic force i. Nails attracted by a lodestone d. Electrostatic force v. An electron repelled by another electron e. Muscular force iii. Horse pulling a cart

E M B I B E

I Explore 3rd EDITION A Science Textbook 8>Chapter 9 - Force>Check Point>Q 1

EASY

8th CBSE

IMPORTANT

Earn 100

Name two contact forces.

Important Questions on Force

EASY

8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 9 - Force>Check Point>Q 2

Name three non-contact forces.

MEDIUM

8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 9 - Force>Check Point>Q 3

Match the correct answer:

a. Gravitational force	i. Nails attracted by a lodestone
b. Friction force	ii. Motion of Earth around the sun
c. Magnetic force	iii. Horse pulling a cart
d. Electrostatic force	iv. A ball rolling on the floor
e. Muscular force	v. An electron repelled by another electron