Yo, here are revision notes for the entire OCR Physics mechanics, made using the 2014 specifications, so should be useful. Thanks
Module 1 Motion
Physical quantities and units
some physical quantities consist of a numerical magnitude and a unit.
Mass = kilogram kg
Length = meter m
Time = second s
Temperature = kelvin K
electric current = ampere A
pico (p) = 10^-12
nano (n) = 10^-9
micro ( = 10^-6
milli (m) = 10^-3
centi (c) = 10^-2
kilo (k) = 10^3
mega (M) = 10^6
giga (G) = 10^9
tera (T) = 10^12
mass of a person - 70kg
height of a person - 1.5m
walking speed - 1ms^-1
speed of a car on a motorway - 30ms^-1
volume of a can - 300cm^3
density of water - 1000kgm^-3
weight of an apple - 1N
e.m.f. of a car battery - 12V
current in a domestic appliance - 13A
Scalars and vectors
Scalar - only have magnitude - speed, mass
Vector - have magnitude and direction - acceleration, displacement, weight
use pyphagoras and trigonometry to determine resultant force
displacement - a vector quantity that refers to the change in meters of the overal position from the origin.
instantaneous speed - a scalar of the rate of movement of a body expressed as the rate of change of position with respect to time at a particular point.
average speed - the distance travelled divided by the time
velocity - is a vector quantity that refers to the rate at which an object changes its position.
acceleration - the rate of change of velocity
average speed = distance/time
acceleration = change in velocity/time
velocity - the gradient of a displacement-time graph
displacement - area under a velocity-time graph
acceleration - gradient of a velocity-time graph
V = U+at for free fall g = a = 9.81ms^-1
S = ((u+V)/2) x t
S = ut + 0.5 x at^2
v^2 = u^2 + 2as
Aristotle believed that heavier objects fall faster than lighter ones, however Galileo disproved this with the inclined plane experiement. He timed using a water clock balls rolling down a slope in a groove, finding that the distance travelled was proportional to the time squared. Proving acceleration is constant.
Experiment to measure the acceleration of free fall
1) measure h
2) flick the switch simultaneously starting the timer and releasing the ball
3) The ball falls through the trapdoor stopping the time
h = 0.5 gt^2
measurement of h
Module 2 forces in action
net force = mass x acceleration (F = ma)
newton - a force required to give a mass of 1 kg of 1ms^-1
apply uvast and F=ma to analyse the motion of objects.
The special theory of relativity states that the mass of an object increass as it apporaches the speed of light, so that we can no longer use the equation F = ma.