Physics Chapter Force Ppt Presentation

FORCEDO YOU KNOW WHAT IS FORCE? A FORCE IS THAT PHYSICAL CAUSE THAT CHANGES EITHER THE SIZE OR THE SHAPE OR THE STATE OF REST OR MOTION OF A BODY.FOR EXAMPLE :- BY LOADING A SPRING HANGING FROM A RIGID SUPPORT, THE LENGTH OF THE SPRING INCREASES. KINDS OF FORCESTHERE ARE TWO KINDS OF FORCESCONTACT FORCES NON-CONTACT FORCES CONTACT FORCESTHE FORCE WHICH IS APPLIED ON THE BODY BY MAKING A PHYSICAL CONTACT WITH THEM ARE CALLED CONTACT FORCES.EXAMPLES:- FRICTIONAL FORCE, NORMAL REACTION FORCE, TENSION FORCE, RESTORING FORCE AND FORCE OF COLLISION. FRICTIONAL FORCE (EXAMPLE 1)When a body slides over a rough surface, a force starts acting on the body in a direction opposite to the motion of the body, along the surface in contact. This is called FRICTIONAL FORCE. NORMAL REACTION FORCE(EXAMPLE 2)When a body is placed on a surface, the body exerts a force downwards, equal to its weight, on the surface, but the body does not move because the surface exerts an equal and opposite force on the body normal to the surface which is called NORMAL REACTION FORCE. TENSION FORCE(EXAMPLE 3) When a body is suspended by a string attached to a rigid support, the body, due