Science - Kinematics: Test Revision

Acceleration

Any change in velocity (speed or direction). Measured in metres per second per second. Is a vector quantity, like velocity, meaning it must have a direction.

Average Acceleration

The average change in a velocity over a period of time. Formula is (v2-v1)/(t2-t1)

Displacement

The change in position of an object. Measured in a straight line from an object’s start to end. Indicates a direction.

Distance

How far an object has travelled. Not a straight line. Length of a path from start to finish

Kinematics

The branch of physics that describes motion.

Speed

The rate of change of an object’s position

Velocity

The speed of an object in a certain direction. Must have a specific direction, e.g. 27km/h east.

Vector Quantity

A quantity that has both a size and a direction.

What do the slopes on a velocity time graph indicate (Flat, Going Up, Going Down)

Flat - Zero Acceleration

Going Up - Getting faster (positive acceleration, the steeper, the higher the rate of acceleration).

Going Down - Getting slowed or faster in negative acceleration

What do the slopes on a distance time graph indicate (Flat, Upward Slope, Upwards then starts to get flat)?

Flat - Not moving, but doesn’t drop to 0

Upward slope - Moving and covering distance (the steeper, the faster)

Upwards then starts to get flat - Started fast, now slowing down and starting to stop

What do the slopes on a speed-time graph indicate (Going up, Flat, Going down)?

Going up (travelling and moving at speed, the steeper, the faster. Not a constant speed)

Flat (at a consistent speed)

Going down (slowing down)

Convert between km/hr and m/s

Km/hr to m/s = Divide by 3.6 (1km/hr/3.6 = 0.277m/s)

M/s to km/hr = Multiply by 3.6 (1m/s x 3.6 = 3.6km/hr)