Forces and motion!

Speed, velocity &acceleration
1. speed
  1. average speed =distance moved/time taken
    1. on most journeys, the speed of a car varies, so the acctual speed is usually different- than the average speed
      1. it is a SCALAR quantity
        measured in m/s
2. velocity
  1. velocity means the speed fof something AND its direction of travel
    1. it is a VECTOR quantity
      1. measured in m/s
3. acceleration
  1. something is accelerating if its velocity is changing
    1. average acceleration = change in velocity/ time taken
      1. a = v-u / t
        u= initial velocity, v= final velocity
        measured in m/s^2
Free Fall
1. The acceleration of free fall, g
  1. Acceleration of free fall is the same for ALL objectrs falling nearthe earth's surface.
    1. The acceleration of free fall is represented by the symbol g , its value varies slightly from one place to another beausethe earths gravitational pull varies the simple figure used for equations is 10m/s^2
2. up and down

Resource summary

	Created by Raya Sawalha over 9 years ago