physics exam 1

aristotle, newton, def

aristotle

natural motion and violent motion

natural motion

proposed that every element in the universe had a proper place and naturally strives to get there eg. heavy objects fall to the earth

violent motion

movement imposed by an external push or pull eg. arrow in motion

newton

3 laws and universal gravitation

first law

object in motion stays in motion, object at rest stays at rest unless acted upon an unbalanced external force

second law

f=ma

third law

for every action, there is an equal and opposite reaction

universal gravitation

proposing every particle attracts every other particle in the universe

distance

how far you have moved

displacement physics

how far away you are from the starting point and your direction

speed

how fast you are travelling

acceleration

a rate at which an object changes its velocity

velocity

how fast you are travelling in a given direction

force

an interaction that changes its motion or shape of an object

inertia

mattter that causes objects to resist changes to their velocity

scalar

has magnitude only eg. speed, temperature

vector

has magnitude and direction eg. displacement, force

gravity

fundamental, invisible force of attraction between an two objects with mass