Kinematics Flashcards
Define average speed
Rate of change of distance
Define velocity
Rate of change of displacement
Define displacement
Distance travelled in a particular direction (vector quantity)
Define acceleration
Rate of change of velocity
Define instantaneous speed
Speed of an object at a particular moment
What does the gradient represent on a distance-time graph?
Gradient=speed
How are distance-time graphs and speed-time graphs linked?
Speed-time graphs are the graphs of the gradient of the distance time graphs
What does the area represent on speed-time graphs?
Distance travelled
What’s special about displacement-time graphs and velocity-time graphs?
They can go negative
What are the 5 suvat equations?
v=u+at v^2=u^2+2as s=ut+1/2at^2 s=vt-1/2at^2 s=1/2(u+v)t
How can a an object accelerate at a constant speed?
When changing direction eg. going in a circle as acceleration is the rate of change of velocity which is a vector quantity
Define stopping distance
Thinking distance+braking distance
Define thinking distance
Distance it takes while you react to something which means you have to stop
Define braking distance
Distance between you applying the brakes and coming to a complete stop
Thinking distance depends on….
- tiredness
- distractions
- alcohol/drugs
- initial speed
