physics unit 3 Flashcards
(14 cards)
what is newtons 3rd law
for every action there is an equal and opposite reaction
what is hooke’s law
the amount a spring is stretched (or compressed) is proportional to the force applied to it
what is a force
a push or a pull
how do we measure forces
in Newtons
in a force diagram, what does the direction of the arrow show
the direction of the force
what is the name of the force that pulls people towards earth
weight
what is the name of the force when solid surfaces rub against each other
friction
what is the name of the force that stops objects from sinking
upthrust
how do you squash an object
push on the opposite side of the object
what is the name of the force that stops objects from falling throw a solid substance
a normal contact force
what do we call the change in size when an object is squashed
compression
what is the equation to calculate extension?
extension = new length - original length
what units do you use to measure extension
metres
one simple machine
a lever
