y10 kinematics

speed

the rate of change of distance

motion

the action or process of moving or being moved

km/h > m/s

/3.6

m/s > km/h

x3.6

formula for speed

speed = distance/time

average speed

the average of instantaneous speeds over a period of time

instantaneous speed

how fast an object is moving at a single moment

scalar quantity

a quantity that has a magnitude but not a direction

vector quantity

a quantity that has both a magnitude and a direction

distance

how far an object has travelled

displacement

a change in position of an object

velocity

the rate of change of displacement

velocity formula

velocity = displacement/time

acceleration

the rate of change of velocity

acceleration formula

acceleration = velocity/time

what does negative acceleration mean if negative directions have not been defined?

positive acceleration = body is getting faster

negative acceleration = body is slowing down

what does negative acceleration mean if negative directions have been defined?

for something moving in the positive direction, negative acceleration = slowing down
for something moving in the negative direction, negative acceleration = speeding up

acceleration due to gravity

a change in velocity due to gravitational force

what is the value of acceleration due to gravity

10m/s^2 or 1g