1. Speed and velocity
1.1. Average speed=Total distance travelled/total time taken
1.1.1. m/s
1.2. AverageVelocity=displacement/time taken
1.2.1. m/s
1.2.1.1. Vector
2. Weight and g
2.1. Weight
2.1.1. Newton(N)
2.2. Mass
2.2.1. Kg
2.3. gravitational field strength
2.3.1. g
2.3.1.1. 10N/kg
2.4. acceleration
2.4.1. weight/mass=10ms-2
2.4.1.1. g
2.4.1.1.1. acceleration of free fall
2.5. F=ma
2.5.1. Force=weight
3. Density
3.1. density=mass/volume
3.1.1. kgm-3
3.2. alcohol=800
3.3. aluminium=2700
3.4. iron=7900
3.5. lead=11300
4. Pressure
4.1. pressure=force/area
4.1.1. pascal(Pa)
4.2. liquids and gases are fluids
4.2.1. pressure acts in all directions
4.2.2. force produced is always at right-angles to the surface under pressure
4.2.3. pressure increase with depth
5. Units of measurement
5.1. SI units
6. Displacement
6.1. metre(m)
6.2. Vectors
6.2.1. Both magnitude and direction
7. Acceleration
7.1. Average acceleration=change in velocity/time taken
7.1.1. ms-2
7.1.1.1. Vector
7.2. Velocity time graph
7.2.1. gradient
8. Force
8.1. newton(N)
8.2. Vector
8.3. If 2 or more forces act on something, their combined effect
8.3.1. Resultant force
8.3.1.1. balanced=0
8.3.1.1.1. acceleration is 0
8.4. resultant force=massxacceleration
8.4.1. F=ma
8.4.1.1. more mass,more force is needed to produce any given acceleration
9. Moments and balance
9.1. turning effect of a force is moment
9.1.1. moment of force=force x perpendicular distance from point
9.1.1.1. distance=line of action of the force
9.2. balance=anticlockwise moment=clockwise moment
9.2.1. total weight=single force acting on Centre of gravity(CG)