How can we tell from a distance-time graph if an object is stationary?
The line is horizontal
How can we tell, by looking at distance time graph, if an object is moving at a constant speed ?
The line is straight and slopes upwards.
What does the gradient of a distance-time graph tell us?
This represents the object’s speed.
How do we calculate the speed of an object?
Speed in m/sec = distance travelled (m) /time taken (s)
What is the difference between speed and velocity?
Velocity is speed in a given direction.
What is acceleration and what is its unit of measurement?
Acceleration is change of velocity per second. m/s squared.
How do we calculate the acceleration of an object?
Acceleration = change of velocity / time taken
What is deceleration?
Or negative acceleration. When an object slows down.
What can we say if a velocity-time graph is a horizontal line?
The acceleration is zero
How can we tell from a velocity-time graph if an object is accelerating or decelerating?
From the gradient of the line.
What does the area under a velocity-time graph represent?
Distance travelled.