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3209077
P2
Descrição
All of P2
Sem etiquetas
physics
triple science
gcse
Mapa Mental por
WholcokedOtaku
, atualizado more than 1 year ago
Mais
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Criado por
WholcokedOtaku
mais de 8 anos atrás
4
0
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Resumo de Recurso
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
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