Kinematics Flashcards
Speed, Velocity, Distance, Displacement, Acceleration
What is Distance?
Total length covered between 2 points (Scalar)
What is Displacement?
Straight line distance in a specific direction between an object and a specific point/starting point (Vector)
SI unit for Displacement and Distance?
metres (m)
What is Speed?
Rate of change of Distance (Speed= d/t) (Scalar)
What is Velocity
Rate of change of Displacement (Velocity= displacement/time) (Vector)
SI unit for Speed and Velocity?
m/s or ms^-1
What is average speed?
Total d/Total t
What happens when the speed is 0
The object is at rest/stationary/does not move
What is Acceleration
Rate of change of velocity
(change in velocity/time taken OR a= v-u/t) (Vector)
SI unit of acceleration?
m/s^2
What is Deceleration
An object moving at decreasing velocity OR negative acceleration
Does negative acceleration ALWAYS = to Deceleration?
No, negative acceleration can be acceleration in a negative direction
How to read a Distance-time graph?
A non-decreasing graph, regardless of whether object changes direction.
Gradient of distance-time graph at any point=Speed
How to read a Speed-time graph?
A non-negative graph, regardless of whether an object changes direction. (Speed can NEVER be NEGATIVE)
When speed=0 object is at rest
When speed>0 object is moving
Gradient of speed-time graph at any point=Acceleration
Area under speed-time graph=Distance travelled
How to read a displacement-time graph?
Can decrease, dependent on whether an object changes direction. (Can be positive or negative)
Gradient of displacement time graph=Velocity
