1. Definitions ! Forces and Motion

2. Acceleration ! Acceleration is the rate of change of velocity, with respect to time. Velocity ! Velocity is the rate of change of displacement, with respect to time.

3. Vectors ! Vectors, unlike scalars, have both a magnitude and a direction. Scalars ! Scalar quantities have only a magnitude.

4. Power ! Power is the work done per unit of time. Power (W) = work done time time Power (W) = Force x Speed Weight ! The weight of a body is the force of gravity acting on a body, it is measured in Newton’s (N).

5. Density ! Density can be defined simply as “mass per unit volume”. Density (Kg/m 3 ) = Mass Volume Pressure ! The force being applied per unit area. Pressure (Pa) = Force Area

6. Strain ! The strain on an object is the extention against the original length. Stress ! The force being applied per unit area. Stress (Pa) = Force Area

7. Young’s Modulus Young’s Modulus, measured in “Pa” (Pascal) is simply: Young’s Modulus = Stress Strain Strain Moments ! A Moment is the product of force and the perpendicular distance from a pivot.

8. Speed ! Speed is the rate of change of distance. Speed = Distance Time Time Watt ! One watt is one joule of energy transferred per second.

9. The Four Equations of Motion ! v = u + at v = u² + 2as S = (u+v)t 2 S = ut + ½ at²

10. Kinetic Energy ! Kinetic Energy = ½Mv² (J) Potential Energy ! Potential energy = Mgh (J) Work Done ! Work Done = Force X Distance Moved (J)

11. Newton’s 3 Laws of Motion Law Of Inertia Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. Force = Mass x Acceleration The relationship between an object's mass (m), its acceleration (a), and the applied force (f) is “F = ma”. Acceleration and force are vectors. In this law the direction of the force vector is the same as the direction of the acceleration vector. For every action, there is an equal reaction (e.g. Stepping off a boat onto the shore/dock causes the boat to drift back in the opposite direction. Thus leaving the person in the water, IF they are not careful!)