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LAWS OF MOTION

SCERT CLASS IX PHYSICS PART 1 CHAPTER 3

TermDefinition
BALANCED FORCES The applied force, when the total force on the body is zero. Such forces can neither move a body at rest nor stop a body in motion.
WHEN AN UNBALANCED FORCE IS APPLIED ON A BODY There will be a change in its state of rest or the direction of motion or speed.
NEWTON'S FIRST LAW OF MOTION Every object continues in its state of rest or of uniform motion along a straight line unless an unbalanced external force acts on it.
INERTIA OF REST Tendency of a body to remain in its state of rest or its inability to change its state of rest by itself.
INERTIA Inability of a body to change its state of rest or of uniform motion along a straight line by itself.
HOW INERTIA DEPENDS UPON ITS MASS? When the mass increases, inertia also increases.
MOMENTUM Characteristic property of moving objects. It is measured as the product of the mass of the body and its velocity.
NEWTON'S SECOND LAW OF MOTION The rate of change of momentum of a body is directly proportional external force acting on it.
UNIT OF FORCE Newton
ONE NEWTON Force required to produce an acceleration of 1m/s^2 on a body of mass 1 kg.
IMPULSE Product of force and time.
WHEN THE CHANGE OF MOMENTUM IS A CONSTANT The force acting on a body will be inversely proportional to the time taken.
NEWTON'S THIRD LAW To every action there is an equal and opposite reaction.
LAW OF CONSERVATION OF MOMENTUM In the absence of an external force, the total momentum of a system is a constant.
CIRCULAR MOTION The motion of an object along a circular path
CENTRIPETAL ACCELERATION The acceleration experienced by an object in a circular motion, along the radius, towards the centre of the circle.
CENTRIPETAL FORCE The force that creates a centripetal acceleration.
EQUATION FOR CENTRIPETAL FORCE F = mv^2/r
UNIFORM CIRCULAR MOTION If an object moving along a circular path covers equal distances in equal intervals of time.
EXAMPLE FOR UNIFORM CIRCULAR MOTION The motion of the tip of the second hand of an antique pendulum clock.
Created by: Aneena
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