Zusammenfassung der Ressource
P2
- Speed and velocity
- Speed= How fast you are going e.g 30mph
- Velocity= speed with a direction specified e.g 30mph north
- Distance + Time graphs
- Steeper curve = Speeding up
- Curves
- Up = Acceleration
- Down = Deceleration
- Calculating
- Speed = Gradient =
vertical/horizontal
- e.g 500/30 (use scales NOT cm) = 16.7m/s
- change in distance/change in time
- Steeper = Faster
- Straight = Steady speed
- Levelling = Slowing down
- Flat = Stationary
- Gradient = Speed
- Downhill = Back to starting point
- Acceleration
- Define
- How quickly the velocity is changing.
- Change in velocity: change in speed or change in direction or both
- Change in velocity/time taken
- (v-u)/(axt)
- v-u= change in velocity
- a= acceleration = m/s2
- Velocity-time graph
- Gradient = Aceleration
- Curve = changing acceleration
- Flat sections = steady speed
- Steeper = greater the acceleration/deceleration
- Uphill = Acceleration
- Downhill = Deceleration
- Area under any section is equal to the distance
travelled in that time period.
- Acceleration = Gradient = vertical change/horizontal change
- e.g 30/20 = 1.5m/s2
- Gravitational force
- Rule: Attracts all masses
- Effects
- 1. On a planet makes all things accelerate towards the ground,
with the same acceleration. (10m/s2 on Earth)
- 2. Gives everything a weight
- Weight and mass
- Mass = amount of stuff in an object
- Weight = Pull of gravitational force causes weight