Physics Formulas for the chapter-Force and Pressure

Apr 26, 2022, 16:45 IST

Chapter-Force and Pressure of class 8 Science 

A force can –

• Move a stationary body.
• Stop a moving body.

Contract forces

The forces which act on a body either directly or through some connector are called contact forces.

E.g. Biological forces, mechanical forces and frictional forces are the examples of contact forces.

• Muscular force: this force produced by the muscles of living being is called muscular force or biological force.
• Mechanical forces: The forces generated by a machine are called mechanical forces.
• Thrust: The force acting on an object perpendicular to the surface is called thrust.
• Atmospheric pressure: The Pressure exerted by this air is known as atmospheric pressure its magnitude is around 100 kilo pascal (100 K Pa) at sea level.
• Pressure: the thrust (compressive force acting perpendicularly to the surface) acting per unit area is called pressure
• Pressure in liquids: It depends upon the depth of the liquid and density of the liquid.

Non-contact forces

• Non-contact forces: The forces which do not make a direct contact with a body and act through space without any connector are called non-contact forces. E.g. Gravitational force, Electrostatic force, Magnetic force
• Gravitational force: The pull exerted by the earth on the objects is called force of gravity or gravitational force.
• Electrostatic force: Electrostatic force is a force which can push or pull tiny objects.

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