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Solutions ⇒ Class 8th ⇒ Science ⇒ 11. Force And Pressure

# Solutions 11. Force And Pressure - Additional Questions With Solutions | Class 8 Science - Toppers Study

Topper Study classes prepares ncert solutions on practical base problems and comes out with the best result that helps the students and teachers as well as tutors and so many ecademic coaching classes that they need in practical life. Our ncert solutions for Solutions 11. Force And Pressure - Additional Questions With Solutions | Class 8 Science - Toppers Study is the best material for English Medium students cbse board and other state boards students.

## Solutions 11. Force And Pressure - Additional Questions With Solutions | Class 8 Science - Toppers Study

Ques: Define force.

Ans: A push or a pull on an object is called a force.

Ques: Define muscular force.

Ans: The force resulting due to the action of muscles is known as the muscular force.

Ques: Write the kinds of force.

Ans: There are two kinds of force.

(i) Contact force

(ii) Non-contact force

Ques: What is contact force? Write its types.

Ans: Muscular force can be applied only when it is in contact with an object, it is also called a contact force.

This is two types.

(i) Muscular force – The force resulting due to the action of muscles is known as the muscular force.

(ii) Frictional force  -  The force acts opposite to the direction of motion and this is responsible for changing the state of motion of objects. It arises due to contact between the surfaces.

Ques: Why is frictional force known as contact force?

Ans: The frictional force known as contact force as it arises due to contact between the surfaces.

Ques: What is non-contact force? Write its types.

Ans: The force which is felt by the objects without any contact is known as non-contact force.

This is two types.

(i) Electrostatic force – The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.

(ii) Gravitational force – Every object attracts each other and pulls toward itself. Such force which applied on objects is known as Gravitational force and gravitation

Ques: Define Pressure.

Ans: The force acting on a unit area of a surface is called pressure

Ques: Why shoulder bags are provided with broad straps and not thin strap?

Ans: Broad straps reduce pressure on back. If the strap will be thin the value of pressure will be raised as per unit area of surface gets reduced.

Ques: Why have nails sharp edges?

Ans: Nails have sharp edge because if per unit area of surface is reduced the pressure on it is increased. Hence nails push easily.

Ques: What is atmosphere ?

Ans: Envelop of air is known as the atmosphere.

Ques: What is atmospheric pressure?

Ans: The pressure exerted by this air is known as atmospheric pressure.