Speed, Velocity and acceleration Flashcards
What is the average speed measured in?
metres per second, m/s
What is the distance moved measured in?
metres, m
What is time taken measured in?
seconds, s
On a distance-time graph what is the vertical axis?
The distance travelled from the start.
On a distance-time graph what is the horizontal axis?
The time from the start.
What does it mean if the line is steeper?
The object is travelling fast.
What is the equation for acceleration?
Acceleration (metre per second squared) =
Change in velocity (metre per second) / time taken (seconds, s)
What is acceleration?
When an object speeds up.
What is deceleration?
When an object slows down.
Is there a difference in units between acceleration and deceleration?
No, they are the same, just that the deceleration number have a negative symbol in front (-).
What is the velocity of an object?
It’s speed in a particular direction.
What can velocity-time graphs also be called?
Speed-time graphs.
what does it mean if a line is sloping downwards - with a negative gradient?
It represents an object with a constant deceleration.
What does the area under the line in the velocity-time graph represent?
The distance travelled.
How do you work out the area of a triangle?
area of a triangle = 1/2 x base x height
How do you work out the distance for a velocity-time graph?
divide the area into rectangles and right angled triangles and then add them together for the total area.
What do scalar quantities include?
Distance, Speed, Time, Power, Energy
When do scalar quantities change?
When their magnitude changes.
What has both magnitude and direction?
Vector quantities.
What do vector quantities include?
Displacement, Velocity, Acceleration, Force, Weight, Momentum
When do vector quantities change?
When their magnitude changes, their direction changes and their magnitude and direction both change.
