physics dynamics revision
how do you find avarege speed?
v = d/t
what does v stand for?
speed
what is instintanious speed?
the speed at any one point
what is acceleration measured in?
(ms-2)
what is the formula for finding acceleration
a = v - u / t
what is force measured in
newtons (N)
examples of when friction can be usefull
- car tyres
- brakes
- rock climbing
if forces are balanced will the object speed up?
no
if forces are unbalanced what will happen to the speed of an object
it will accelarate or decelerate
what is the formula for unbalanced forces
unblananced force = mass x acceleration ( f = m x a )
is mass a force
no
w = mg stands for what?
weight = mass x gravitational feild strength