P2 | Mind Map

Speed and velocity
1. Speed= How fast you are going e.g 30mph
2. Velocity= speed with a direction specified e.g 30mph north
Distance + Time graphs
1. Steeper curve = Speeding up
2. Curves
  1. Up = Acceleration
  2. Down = Deceleration
3. Calculating
  1. Speed = Gradient = vertical/horizontal
    1. e.g 500/30 (use scales NOT cm) = 16.7m/s
    2. change in distance/change in time
4. Steeper = Faster
5. Straight = Steady speed
6. Levelling = Slowing down
7. Flat = Stationary
8. Gradient = Speed
9. Downhill = Back to starting point
Acceleration
1. Define
  1. How quickly the velocity is changing.
    1. Change in velocity: change in speed or change in direction or both
2. Change in velocity/time taken
  1. (v-u)/(axt)
    1. v-u= change in velocity
    2. a= acceleration = m/s2
Velocity-time graph
1. Gradient = Aceleration
2. Curve = changing acceleration
3. Flat sections = steady speed
4. Steeper = greater the acceleration/deceleration
5. Uphill = Acceleration
6. Downhill = Deceleration
7. Area under any section is equal to the distance travelled in that time period.
8. Acceleration = Gradient = vertical change/horizontal change
  1. e.g 30/20 = 1.5m/s2
Gravitational force
1. Rule: Attracts all masses
2. Effects
  1. 1. On a planet makes all things accelerate towards the ground, with the same acceleration. (10m/s2 on Earth)
  2. 2. Gives everything a weight
Weight and mass
1. Mass = amount of stuff in an object
2. Weight = Pull of gravitational force causes weight

P2

	Created by WholcokedOtaku over 9 years ago