Kinematics

Vector quantity

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