Accelerating Motion and Forces: Unit 1: 2nd Law and Acceleration

Physics

Resultant Vector

The vector sum of two or more vectors

Accelerating

Changing velocity

ex: speeding up, slowing down, and turning are all accelerating since your velocity changes

Acceleration

rate of change in velocity

ex: a train may have a very high top speed but usually a low acceleration because it takes them a long time to speed up and slow down

what is the symbol for acceleration?

the symbol for acceleration is a

what is the unit for acceleration?

the unit for acceleration is m/s/s or m/s²

if something is speeding up the direction of acceleration is?

if something is speeding up, the acceleration direction = the same direction as velocity

if something is slowing down the direction of acceleration is?

if something is slowing down, the acceleration direction = opposite direction of velocity

newtons’s 2nd law

a=F_net/m

acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass

unbalanced forces always goes with?

unbalanced forces (f_net does not =0) and changes in velocity (acceleration) always go together

humans cannot feel velocity, but we can feel?

humans cannot feel velocity, but we can feel acceleration

explain the acceleration unit of m/s/s

it is how quickly you change how fast your going

ex: changing by 2 meters per second per second

positive acceleration does not mean?

negative acceleration does not mean?

positive acceleration does not mean speeding up

negative acceleration does not mean slowing down

what matches when speeding up?

direction of velocity (the way something goes) and direction of acceleration

what is opposite when slowing down?

direction of velocity( the way something goes) and direction of acceleration

what always match’s?

direction of Fnet, sign of slope of velocity time graph, sign of change in velocity matches with direction of acceleration`