Chapter 3: Motion Flashcards
What are distance time graphs used for
To represent motion of objects
How is a stationary object represented on a distance time graph
Horizontal straight line
How is an object moving at constant speed represented on a distance time graph?
Straight sloping line
Displacement vs distance
Displacement is a vector and distance is a vector
Acceleration def
Rate of change of velocity
Acceleration: vector or scalar
It is determined from velocity therefore it is a vector
Acceleration on velocity time graphs
Gradient
Straight line on velocity time graph means
Constant acceleration
Straight line of zero gradient on v/t graph means
No acceleration
Straight line of negative gradient on v/t graph means
Constant deceleration
Curve with changing gradient on v/t graph
This means the acceleration is changing
List the suvat equations
V = u + at
S = ut + 1/2at^2
S = (u+v/2)t
V^2=u^2+2as
Stopping distance definition
The total distance travelled from where the driver sees a reason to stop to when the vehicle stops
Thinking distance definition
The distance travelled between the moment when you first see a reason to stop to the moment when you use the break
Braking distance definition
The distance travelled from the time the brake is applied until the vehicle stops
