G484 - Newtonian Laws of Motion Definitions

Some revision cards of the key definitions

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  • Created by: Lewis F
  • Created on: 30-12-11 09:33

Newton's First Law




Define Newton's 1st Law

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Newton's First Law


An object will remain at rest or continue to travel at a constnat velocity unless acted upon by an external force.


No Force, No Acceleration

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Newton's Second Law



Define Newton's 2nd Law

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Newton's Second Law



The rate of change of momentum of an object is directly proportional to the resultant force acting upon said object, in the direction of the force

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Newton's Third Law



Define Newton's 3rd Law

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Newton's Third Law


When two bodies interact, the forces they exert on each other are opposite and equal.

These forces do not cancel out as they act in two seperate bodies

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Define Momentum

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Momentum (p) is the product of an obects mass and its velocity


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Define Impulse

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Impulse is the product of a force and the time for which it acts.

Impulse is equal to the rate of change of momentum

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Elastic Collisions



Define the term 'Elastic Collisions'

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Elastic Collisions


Elastic Collisions are when kinetic energy is conserved - momentum and total energy is always conserved.

Kinetic energy before = Kinetic energy after

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Inelastic Collisions



Define the term 'Inelastic Collisions' 

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Inelastic Collisions


Kinetic energy is not conserved - it is transferred into other forms such as heat.

Momentum and total energy are always conserved

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