Force and Pressure class 8

Everyone wants to know that what is force? And what is pressure? In this post I will tell you everything about force and Pressure.
In this post you can find these things:-

• Important points.
• Important questions.
• Important definitions.

Important points:-

• Effects of force:-

1. Change in the motion.
2. Change in size/shape of an object.

• We can say that a force may-

1. Make an object move from rest.
2. Change the speed of a moving object.
3. Change the direction of a moving object.
4. Bring a change in the size or shape of an moving object.
5. Cause two or more or all of these effects on one time.

• There are two type of forces:-

Contact forces, there are two types of contact forces:-
 1. Muscular forces
 2. Frictional forces

•    Non contact forces, there are three types:-G

1. Gravitational force
2. Magneticforce
3. Electric force

• Pressure = Thrust                             

            Surface area over which it acts

• Properties of liquid pressure:-

1. Liquid pressure on the bottom of the container does not depend on the area of the bottom.
2. Liquid pressure at any point inside the liquid depends upon the density of the liquid and the height of liquid column above the point.

Important questions:-
Question 1:- What Is Force?
Answer 1:- Force is a push or pull upon an object experiences when it interacts with another object.
Question 2:- What is pressure?
Answer 2:- The thrust acting on a unit area of a surface is called pressure.
Important definitions:-

• Spring balance:- Spring balance is the simple device that can be used for measuring the force acting on the object.
• Force:- Force is a push or pull upon an object which experiences when it interacts with another object.
• Pressure:- The thrust acting on a unit area of a surface is called pressure.
• Contact forces:- Contact force is  the force which acts only when objects are in physical contact with each other.
• Non contact forces:- Non contact forces are the force of interaction which acts on an object without its having any direct physical contact with another body.
• Muscular forces:- Muscular force is force exerted by the action of muscles in the body of living beings.
• Frictional forces:- Frictional force is the force between two surfaces in contact usually acts opposite to the Direction of motion.
• Gravitational force:- The force and attraction between two objects due to their masses is called gravitational force.
• Magnetic force:- Force of interaction between a magnet and another (suitable) object/magnet.
• Electric force:- The attraction or repulsion between charges is due to the electric force between them.
• Thrust:- When we apply force in Direction perpendicular to a given surface area then we call it as thrust.
• Liquid pressure:- The pressure exerted by a stationary liquid at any point inside the liquid is known as liquid pressure.
• Atmospheric pressure:- Atmospheric pressure is defined as the force per unit area, exerted on a given surface, by the weight of the air above the surface.

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