P2.3 Motions and forces Flashcards
What is the difference between distance and displacement?
Displacement is a vector, direction isn’t
What is the equation for finding speed?
Speed (m/s) = distance(m) / time(s)
What is a vector?
A quantity that has a magnitude and a direction
What is on the y-axis in a distance-time graph?
Distance
How can you calculate speed in a distance-time graph?
Find the gradient if the line
What do horizontal lines in a distance-time graph mean?
The object is stationary
What is acceleration?
A moving object’s change in velocity
What does getting a negative value when calculating acceleration mean?
The object is decelerating or slowing down
What is the equation for calculating acceleration?
a = (v - u) / t a = (final velocity - initial velocity) \ time
What is acceleration measured in?
m/s^2
Metres per second squared
What does a horizontal line in a velocity-time graph mean?
The object is travelling at a constant velocity
How does the steepness of the line affect acceleration in velocity-time graph?
The steeper the line the greater the acceleration
How do you calculate distance from a velocity-time graph?
You find the area under the graph
What is a force?
A push or a pull that can make objects change speed, shape or direction
Is force a vector quantity?
Yes
