Motion Flashcards
(19 cards)
Define Scalar
Something that has magnitude and no direction
Give an example of a scalar
Speed, distance
Define vector
Something that has magnitude and direction
What is meant by displacement
The distance travelled in a straight line
What is the equation linking speed distance and time
Speed | Time
what are the units for acceleration
m/s^2
what does a sloping line represent on a velocity- time graph
acceleration
what does a horizontal line on a velocity time graph represent
constant speed
how do you calculate the distance travelled on a sloped part of a velocity- time graph
split it into a triangle and work out he area underneath the line
how do you calculate the distance travelled on a horizontal part of a velocity - time graph
split it into a rectangle and work out the area underneath the line
define acceleration
the measure of how fast velocity is changing
what does a horizontal line represent on a distance time graph
the object is stationary
what is stopping distance
the distance where an object has to start braking
how to we work out stopping distance
thinking distance + braking distance
what factors can affect your thinking distance
use of alcohol/ drugs, tiredness, reaction time
what factors can affect your breaking distance
condition of brake pads, conditions of road and tyre tread depth
what do crumple zones do
they help to increase the time it takes for a car to stop in a crash so reduces forces on passengers
what is momentum
the measure of the tendency of an object to keep moving or how hard it is going to stop
how do we work out momentum
momentum= mass x velocity
