Motion Flashcards
What is speed
How fast your going with no direction
What is velocity
The speed of an object in a specific direction (the vector of speed)
What is displacement
The distance travelled in a specific direction
Average speed equation
Average speed = total distance/ total time
What does the gradient of a distance/time graph show
The steady speed
What do the flat sections on a distance/ time graph show
Stopped
How to show acceleration on a distance/ time graph
With a steeper gradient line
What do curves getting steeper on a distance/time graph show
Accelerating (not constant)
What does a levelling off curve on a distance/time graph show
Decelerating (not constant)
How to show acceleration on a velocity/time graph
Gradient
What do flat sections mean on a velocity/time graph
Steady speed
What do curves on a velocity/time graph mean )
Changing acceleration )
What do downhill sections on a velocity/time graph show \
Deceleration \
How do find the distance travelled on a velocity/time graph
The area
Acceleration equation
a= (v-u) /t
Acceleration unit
m/s^2
What is acceleration
The rate of change of velocity
Displacement letter
S
Average velocity equation
Average v = u+v/2
Displacement equation
(u+v/2) t (average velocity x time)
Mean velocity equation
Velocity = displacement/ time
Stopping distance equation
Stopping distance= thinking distance + braking distance
What is thinking distance
The distance the car travels in the time between the driver noticing the hazard and applying the brakes
What is braking distance
The distance the car travels during its deceleration whilst the brakes are being applied
Factors that affect stopping distance
Increase: tiredness, alcohol, distractions
Decrease: caffeine
What is a scalar quantity
Only has size (magnitude)
What is a scalar quantity
Only has size (magnitude)
What is a vector quantity
Has both size (magnitude) and direction
