M1 Support Pack M1 Exam Wednesday 18th May.

FormulaeYou are not given any formulae in the formula book

The most important part of a solution to a Mechanics question is a good, clear diagram.

Suvat formulae (remember they only apply for constant acceleration)

v = u + at

s = ½ ( u + v ) t

s = ut + ½ at2

s = vt - ½ at2

v2 = u2 + 2as

Force, Impulse, Momentum

F = ma Force = mass x acceleration (Newtons)

W = mg Weight = mass x 9.8 (Newtons)

I = Ft Impulse = force x time (Newton seconds)

mv Momentum = mass x velocity (kg metres seconds -1 or Newton seconds)

I = mv – mu Impulse = change in momentum

m1 u1 +m2 u2 = m1 v1 + m2 v2 In a collision, total momentum before = total momentum after

Friction

F ≤ R Friction is less than or equal to coefficient of friction x normal reaction

Limiting friction = R Limiting or maximum friction occurs when object is moving or on the point of moving.

Friction is measured in Newtons has no units Friction acts to oppose motion

Moments

Moment = force perpendicular distance (Newton metre)

Moments are either clockwise or anticlockwise

Resolving Forces

Many problems can be tackled by resolving forces either vertically and horizontally or parallel to the slope and perpendicular to the slope.

For an object on a slope Force of gravity is mg sin down the slope and mg cos into the slope

MyMaths

There are now a number of lessons and tasks under Mechanics 1 covering nearly the whole syllabus.

These will be very useful to you in your revision

Jan 07

June 07

Jan 08

June 08

Jan 09

June 09

Jan 10

June 10