ways to measure speed
ticker timer, speedo in car, multi flash photos
newtons 1st law
an object at rest will remain at rest until acted upon by an unbalanced force. An object in motion will remain in motion at the same speed and direction it is travelling unless acted upon by an unbalanced force.
newtons 2nd law
an object will accelerate in the direction of an unbalanced force acting upon tithe size of this acceleration depends upon the mass of the object and the size of the force being acted on
newtons 3rd law
for every action there is an equal and opposite reaction
what newtons 1st law called and examples of it
inertia. when you stand in a train you feel when it stops, accelerates and decelerates,
another way to define inertia
an objects tendency to resist any change in motion
example of newtons 3rd law
when you bounce a basketball the force and reaction is that it bounces back up to your hand.
average speed is
a measure of how fast something moves on average
instantaneous speed is
the speed of an object at a particular moment
distance is
the actual length of a path
displacement is
the shortest route to get from point a to point b and the direction
getting from km/hr to m/sec
divide by 3.6
acceleration equation
change in speed over change in time
other version of acceleration equation
final speed - initial speed over total time
