Force and Pressure | NMMS Quick Revision Notes | Class: 8 Physics

  

CLICK Here For Test  Practice 

👉👉NMMS Practice Test - 01

( Force and Pressure)👈👈

• Force: A push or a pull, that changes or tends to change the state of rest or of uniform motion of an object or changes its direction or shape.
• A force arises due to the interaction between two objects.
• Force has magnitude as well as direction. The SI unit of force is Newton.
• A change in the speed of an object or the direction of its motion or both implies a change in its state of motion.
• Force acting on an object may cause a change in its state of motion or a change in its shape.
• A force can act on an object with or without being in contact with it.
  
  Types of Forces:
  Contact Forces: The forces act on a body when the source of force is in actual contact with the body. The point where the force is applied on an object is called the point of application of force (or point of contact).
• (i)  Muscular Force: The force exerted by the muscles of the body. We make use of muscular force of animals like bullocks, horses and camels to get our activities done. 
• (ii)  Mechanical Force: The force produced by a machine.
• (iii)  Frictional Force: The force that opposes the motion of an object.
  
  Non-Contact Forces: Forces which do not involve physical contact between two bodies on which they act.
• (i)  Magnetic Force: A magnet exerts a non-contact force on objects made of iron, steel, cobalt or nickel.
  (ii)  Electrostatic Force: The force which result due to repulsion of similar charges or attraction of opposite charges.
  (iii)  Gravitational Forces: The force that exists between any two bodies by  virtue of their mass.
• Pressure: Thrust acting per unit surface area is called pressure. Thrust is the force acting on an object perpendicular to its surface. In SI system, pressure is measured in newton per square metre which is equal to 1 pascal (Pa).
• Like solids, fluids (liquids and gases) also exert pressure. A solid exerts pressure only in the downward direction due its weight, whereas liquids and gases exert pressure in all directions. Hence liquids and gases exert pressure on the walls of their container. 
• The thick blanket of air that covers the earth is termed atmosphere. The pressure exerted by the atmosphere is called atmospheric pressure. The tremendous atmospheric pressure surrounding us is not felt by us because the fluid pressure inside our bodies counter-balances the atmospheric pressure around us. 

For More :-

CBSE Class–VII  | CHAPTER – 1 Integers |  NMMS  Revision Notes  à Click Here

Tracing Changes Through a Thousand Years | NMMS Revision Notes | Class 7 | Social  à Click Here

New Kings and Kingdoms | NMMS Revision Notes | Class 7 | Social  à Click Here

The Delhi Sultanate | NMMS Revision Notes | Class 7 Social à Click Here

The Mughal Empire | NMMS Revision Notes | Class 7 Social à Click Here

Tribes Nomads and Settled Communities | NMMS Revision Notes | Class 7 Social à Click Here

Devotional Paths to the Divine | NMMS Revision Notes | Class 7 Social à Click Here

The Making of Regional Cultures | NMMS Revision Notes | Class 7 Social à Click Here

Eighteenth Century Political Formations | NMMS Revision Notes | Class 7 Social à Click Here

Environment | NMMS Revision Notes | Class 7 Social à Click Here

Inside Our Earth | NMMS Revision Notes | Class 7 Social à Click Here

Our Changing Earth | NMMS Revision Notes | Class 7 Social à Click Here

Air | NMMS Revision Notes | Class 7 Social  à Click Here

Water | NMMS Revision Notes | Class 7 Social à Click Here

Human Environment Interactions the Tropical | NMMS Revison Notes | Class 7 Social à Click Here

Life in the Deserts | NMMS Revision Notes | Class 7 Social à Click Here

On Equality | NMMS Revision Notes | Class 7 Social à Click Here

How the State Government Works | NMMS Revision Notes | Class 7 Social à Click Here

Role of the Government in Health | NMMS Revision Notes | Class 7 Social à Click Here

Growing up as Boys and Girls | NMMS Revision Notes | Class 7 Social à Click Here

Women Change the World | NMMS Revision Notes | Class 7 Social à Click Here

Understanding Media | NMMS Revision Notes | Class 7 Social à Click Here

Markets Around Us | NMMS Revision Notes | Class 7 Social à Click Here

A Shirt in the Market | NMMS Revision Notes | Class 7 Social à Click Here

Nutrition in Plants | NMMS Revision Notes | Class 7 Science à Click Here

Nutrition in Animals | NMMS Revision Notes | Class 7 Science à Click Here

Heat | NMMS Revision Notes | Class 7 Science à Click Here

Acids Bases And Salts | NMMS Revision Notes | Class 7 Science à Click Here

Physical And Chemical Changes | NMMS Revision Notes | Class 7 Science  à Click Here

Respiration In Organisms | NMMS Revision Notes | Class 7 Science à Click Here     

Transportation in Animals and Plants | NMMS Revision Notes | Class 7 Science à Click Here

Force and Pressure | NMMS Quick  Revision Notes | Class: 8 Physics à Click Here

Reproduction In Plants | NMMS Revision Notes | Class 7 Science à Click Here

Motion And Time | NMMS Revision Notes | Class 7 Science à Click Here

Electric Current and its Effects | NMMS Revision Notes | Class 7 Science à Click Here

Light | NMMS Revision Notes | Class 7 Science à Click Here

Waste Water Story | NMMS Revision Notes | Class 7 Science à Click Here

How When and Where | NMMS Revision Notes | Class 8 Social à Click Here

From Trade to Territory | NMMS Revision Notes | Class 8 Social à Click Here

Ruling the Countryside | NMMS Revision Notes | Class 8 Social à Click Here

Tribals Dikus and Vision of Golden Age | NMMS Revision Notes | Class 8 Social à Click Here

When People Rebel | NMMS Revision Notes | Class 8 Social à Click Here

Weavers Iron Smelters and Factory Owners | NMMS Revision Notes | Class 8 Social à Click Here

Civilising the Native Educating the Nation | NMMS Revision Notes | Class 8 Social à Click Here

Women Caste and Reform | NMMS Revision Notes | Class 8 Social à Click Here