2. The runners were stationary ,when the starter gun fired, so they began to drive fast or accelerate .speed is the steady rate of movement over distance.

3. speed records LAND SPEED RECORDS date speed driver car 15/10/97 1227.99 Andy Green Thrust ssc 4/10/83 1010.47 Richard Noble Thrust 2 23/10/70 995.85 Gary Gabelick The blue flame 15/11/65 960.96 Craig Breedlove Spirit of America 7/11/65 922.48 Art Arfan Green monster

9. Velocity When something moves it goes in a particular direction. An airplane for example ,may move at 900 km/ h in a direction due north. The speed and the direction of the movement when given together are called velocity.

10. Acceleration The acceleration of a moving objects is a measure of how it’s velocity changes in certain interval of time. The following equation shows how the steady acceleration of an object can be calculated. Acceleration= change in velocity time

11. Friction This contact force occurs between two objects when there is a push or a pull on one of the objects which could make it move over the surface of the other object. Friction works to oppose that movement . A push or a pull on the object increases, the force of friction between the surface of the other object .Friction acts to oppose that movement.