Best Physics FORCE & LAWS OF MOTION Notes Summarised Chapter Class 9
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PHYSICS
FORCE AND LAWS OF MOTION
Force:
It is a push or pull on an object that produces an acceleration in the body on which it acts. S.I. unit- Newton.
• Balanced force - When balanced forces are applied to an object, there will be no net effective force acting on
the object. Balanced forces do not cause a change in motion.
• Unbalanced force - Unbalanced forces acting on an object change its speed and/or direction of motion. The net
effective force is not zero in this case.
Frictional Force:
The force that opposes relative motion is called friction. It arises between the surfaces in contact.
Y
Frictional Force
(FS)max A
Limiting Friction
FR
C Kinetic
Friction
Static
Friction
DB X
Applied Force
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