AP 8th Class Physical Science Notes Chapter 1 Force and Pressure
→ Atmospheric pressure The pressure exerted by air around us is known as atmospheric pressure.
→ Contact force : Muscular force can be applied only when it is in contact with an object.
→ Electrostatic force The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.
→ Force A push or a pull on an object is called a force.
→ Friction : The resistance to the movement of a body over the surface of another body.
→ Gravitational force : The force which pulls the object towards the earth is called gravitational force.
→ Gravity Attraction, weight, the heaviness of something.
→ Magnetic force : The force exerted by a magnet on another object is called magnetic force.
→ Muscular force : The force resulting due to the action of muscles is known as the muscular force.
→ Non-contact force : A force that acts on an object without being in contact with it.
→ Pressure : The force acting on a unit area of a surface is called pressure.
→ Pull : Apply force so as to move if towards oneself or the origin of the force.
→ Push : An act of exerting force on someone or something to move them away from oneself.
→ Magnitude : Size of quantity is called magnitude. (or) The strength of a force is usually expressed by its magnitude.
→ Force could be a push or a pull.
→ A force arises due to the interaction between two objects.
→ The strength of a force is represented by its magnitude.
→ Force has magnitude as well as direction.
→ 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.
→ The attractive force between any two massive objects is called gravitational force.
→ The force exerted by a magnet on another magnet is called magnetic force.
→ The force exerted by a charged body on other charged or uncharged body is known as electrostatic force.
→ The force which we exert by using our body muscles is known as muscular force.
→ Force per unit area is called pressure.
→ Liquids and gases exert pressure on the walls of their containers.
→ The pressure exerted by air around us is known as atmospheric pressure.