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7500022
Newton's Laws and Momentum
Description
Summary of Newton's laws and momentum with respect to OCR Physics A specification.
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g484
a2 physics
ocr physics a
newton's laws
momentum
impulse
physics
as level
Mind Map by
Imogen Hockenhull
, updated more than 1 year ago
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Created by
Deanna Sartin
about 9 years ago
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Imogen Hockenhull
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Resource summary
Newton's Laws and Momentum
Impulse
Area under force-time graph = Impulse
Ft =∆mv
Car crashes & Crumple Zones
Momentum
p = mv
kg m/s
Vector
Conservation of Momentum
Explosions
Collisions
Elastic
Momentum conserved
K.E. conserved
Inelastic
Momentum conserved
K.E. lost
IN ANY DIRECTION IN THE ABSENCE OF EXTERNAL FORCES, THE TOTAL MOMENTUM OF A SYSTEM REMAINS CONSTANT.
THE MASS OF AN OBJECT MULTIPLIED BY ITS VELOCITY.
Change in kinetic energy = force × distance
Fd = ½mv^2 - ½ mu^2
Change in momentum = force × time
Ft = mv - mu
Newton's First Law
Force causes acceleration
Balanced forces
No net (resultant) force = no acceleration
A FORCE IS NECESSARY TO CHANGE THE STATE OF REST OR OF UNIFORM MOTION IN A STRAIGHT LINE OF A BODY.
Newton's Second Law
THE RATE OF CHANGE OF MOMENTUM OF AN OBJECT IS DIRECTLY PROPORTIONAL TO THE RESULTANT FORCE ACTING ON IT.
The Newton
1N is the force that gives a mass of 1kg an acceleration of 1ms^-2
F = ma, where m is constant
w = mg, where g is acceleration due to gravity = 9.81ms^-2
F ∝ ∆p / ∆t
Mass is inertia
Weight is gravity
Newton's Third Law
WHEN BODY A EXERTS A FORCE ON BODY B, BODY B EXERTS A FORCE ON A THAT IS EQUAL AND OF THE SAME TYPE, AND OPPOSITE IN DIRECTION.
'Action and reaction'
Pairs of forces
................................. .............................. ................................ Not to scale
The gravitational force that the Moon exerts on the Earth is exactly equal and opposite to the gravitation force the Earth exerts on the Moon.
Free body force diagram to determine resultant force on a body
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