P9 - MOTION
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Acceleration
change of velocity per second (in metres per second per second, m/s2)
Deceleration
change of velocity per second when an object slows down
Displacement
Distance in a given direction
Gradient
change in y axis / change in x axis
Tangent
a straight line drawn to touch a point on a curve so it has the same gradient as the curve at that point
What is SUVAT
S is distance U is initial velocity V is final velocity A is acceleration T is time
What is the formula for distance? (speed)
distance = speed or velocity * time
What is the difference between velocity and speed?
Velocity is a vector quantity, speed is a scalar quantity.
What is constant velocity
Constant speed in a given direction
How to describe a distance time graph?
DISTANCE ON Y, TIME ON X 🗡️, straight diagonal lines show that it is moving at a constant speed, for the change in distance divided by the change in time will have the same speed Curved line shows speeding up and speeding down Straight line shows a stationary object
Therefore, what does a curved line show on a distance time graph?
No constant gradient means no constant speed. This means acceleration or deceleration.
How do you estimate the distance on a curved velocity-time graph?
If curved, form a triangle and rectangle, and add up the area.
What is the equation for S.U.V.A?
v2 - u2 = 2as
How to understand velocity time graphs?
Velocity is Y Time is X Read velocity off the graph Acceleration is the change in y / change in x Distance = velocity x time, so it’s the area under the graph
What is the formula for speed?
Distance / time
What is the formula for acceleration?
a = v-u/t