# Mechanics 1 Revision Formulae (OCR)

Mechanics 1 Revision Formulae (OCR)

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## Constant Acceleration

V = U + at

s = vt - 1/2at2

s =  ut + at2

v2   = u2  + 2as

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## Variable Acceleration

s = displacement

ds/dt = v

v = speed

dv/dt = a

a = acceleration

(integrate)a = v

v =  speed

(integrate)v = s

s =  displacement

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## Newton's Second Law

F = ma

where

F is force ( this can be the resultant of two forces in opposite directions)

m is mass

a is acceleration

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## Conservation of Momentum

M1U1 + M2U2  =  M1V1 + M2V2

Where

m is mass

u is speed of particle before collision

v is speed of particle after collision.

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## Limiting Equilibrium

F = µR

where

F is limiting friction (always opposing motion)

µ is the coefficient of friction between the object and the plane

R is the normal, or reaction force

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Your formulas are incorrect in parts

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s=ut+½at²

s=½(v-u)t

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