Kinematics

Vector quantity

has magnitude and direction

scalar quantity

only has magnitude

example of vector quantities

force, velocity, displacement, acceleration

example of scalar quantities

distance, speed, mass, time

velocity symbol

v

displacement symbol

s

acceleration symbol

a

distance symbol

d

speed symbol

v

average velocity

change in position (displacement over time)

Instantaneous velocity

velocity of an object at a single point in time

Velocity formula

v = d/t (velocity = displacement / time)

Graph types

distance/dispalcement time (s-t), speed/velocity time (v-t), acceleration time (a-t)

Displacement time graphs

slope = velocity, average velocity = total displacement/time

Acceleration time graphs

slope = jerk (rate of change of acceleration)

Velcoity time graphs

slope = accelration

Suvat equations

v=u+at, s=(u+v/2)t, v^2=u^2+2as, s=ut+1/2at^2, s=vt-1/2at^2

suvat letters meaning

s=distance, v=final velocity, u=initial velocity, a=acceleration, t=time

g

acceleration due to gravity

g on earth

9\.81 m/s^2

terminal velocity

maximum velocity that is attainable by an object as it falls through a fluid (eg. air)

terminal velocity is reached when the acceleration (a) of an abject is…

0

if object is dropped/thrown…

replace a with g