Foundational Concepts Part 2

Newton’s 1st Law

an object in motion will stay in motion at a constant velocity unless acted upon by an outside force

Newton’s 2nd Law

an objects acceleration is directly proportional to the force causing it

Newton’s 3rd law

for every action or force there is an equal and opposite action or force

what is ground reaction force?

weight down = action

normal force up = reaction

what is work

amount of force required to displace or move and object over a distance

what is potential energy

stored energy related to the position of an object

what is kinetic energy

mechanical energy of a moving object

what is power?

amount of work completed in a given time

what is a first class lever?

EFL (seesaw - C-spine at A-O joint)

what is a second class lever?

ELF (wheelbarrow - gastroc at ankle during plantarflexion)

what is a third class lever?

FEL (paddling a canoe - biceps curl))

what is a mechanical advantage

describes the efficiency of a lever system

what is an anatomical pulley

pulleys increase the mechanical advantage of muscles by making the effort moment arm longer