# AS PHYSICS UNIT 2

Notes for UNIT 2 AS PHYSICS

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## Mechanics Basics

SCALARS - magnitude e.g. speed (m/s)

VECTOR - magnitude + direction e.g. velocity (...m/s bearing North)

Resolving means involving the big P - (Pythagoras) par exemple: if the angle is unknown but one has the 2 side values (adjacent and opposite) then you can work out the resultant value by using.... and work out the angle by using SOH CAH TOA

'Simples'

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## SUVAT Equations (motion avec constant acceleration

v = u + at

v2 = u2 + 2as

s = ut + ½ at2

s = ½ (u + v)t

Voila, c'est facile! Remember these (and what the symbols mean) and ensure you can rearrange them. Do these tasks my young padawan and the path to success will become clear.

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## Free Fall and Projectile Vomi...

Instance Uno - No Initial Velocity (tis just a'fallin) g = a = -9.81

s = ½gt2 v = gt and s = vt/2

Instance Two - Initial Velocity Upwards (thrown into air) The equations are normal SUVAT ones

Instance Drei - Thrown Downwards. The downwards velocity is minus and a = minus but the rest is all SUVAT..y

When doing questions related to 'blah blah is fired at blah blah m/s, blah blah m above the ground. How long does blah blah take to hit the ground and how far does blah blah travel?' ensure that you think in terms of vertical motion and horizontal motion as two separate calculations.

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## G to the R to the A to the P to the H to the S!!!

LOOK IN REVISION GUIDE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

That is all

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