Motion and forces

Speed
1. No direction specified
2. How fast you are going
3. Speed=distance/time
Velocity
1. Direction specified
2. How fast you are going
Acceleration
1. How quickly velocity is changing
2. Vector quantity
  1. Magnitude
  2. Direction
3. Acceleration=change in velocity/time taken
Distance time graphs
1. Gradient=speed
2. Flat sections=stopped
3. Curves=acceleration
Velocity time graphs
1. Gradient=acceleration
2. Flat sections=steady speed
3. Curve=changing acceleration
Forces
1. Size or arrow relates to size of force
2. Gravity is a force
  1. This causes a reaction force of the surface of the earth
3. With no reaction force an object would accelerate
4. Acceleration is unbalanced forces
5. The bigger the unbalanced force, the greater the acceleration
6. Action force
7. Reaction force
8. Resultant force
Weight and mass
1. They are not the same
2. Weight is a force
  1. Measured in newtons
  2. Caused by gravity
3. Mass is not a force
  1. Measured in kg
  2. Amount of 'stuff' in an object
4. Weight=mass x gravitational field strength
Objects in a vacuum
1. Accelerate at the same speed
2. Remember the hammer and the feather on the moon
  1. They both land at the same time
3. Objects in an atmosphere
  1. Terminal velocity
4. No terminal velocity

Resource summary

	Created by Cameron Fuller almost 11 years ago