P2 Motion Flashcards
Define speed.
Rate of change of distance with time. Direction isn’t implied.
Define velocity.
Speed with direction
What is the formula triangle for speed?
D
V * T
If Bolt can do the 200 meters in 19.32 seconds, what is his speed?
200 divided by 19.32
His speed was 10.35 meters per second.
Define acceleration.
How quickly velocity is changing.
It can be in speed or in direction.
How do you calculate the speed of a thing from a distance time graph?
Look at the gradient. Divide the distance travelled by the time taken.
What is the formula for accerleration?
Change in velocity divided by time taken.
What does a flat section on a distance time graph mean?
The thing isn’t moving.
How do you calculate the acceleration of a thing from a velocity time graph?
Vertical change divided by horizontal change.
What does a slope and a flat line mean in a velocity-time graph?
Flat sections mean steady speed.
Slopes mean acceleration or deceleration
Curves are changes in acceleration.
What is the difference between mass and weight?
Mass is the amount of stuff in an object. It is measured in kilograms.
Weight is the force of gravity acting on an object. It is measured in Newtons and is different depending where you are in the universe.
What is the normal force?
If an object is in contact with an surface. E.G a book on a table the normal acts upwards to stop gravity pulling the book through the table.
What is the equation used to calculate the resultant force?
Resultant force on the object=
Mass of the object x acceleration of the object
A jaguar F-type accelerates from 2m/s to 6m/s in 5.6 seconds.
What is the acceleration?
6-2=4
4 divided by 5.6=0.71
0.71 m/s squared.
What do curves on a distance time graph mean?
The thing is accelerating or decelerating. If it is steepening the thing is speeding up and levelling off means it is slowing down.
What number must you multiply speed in m/s to get MPH
2.24
