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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