KINS 4200 Exam 3 Energy Work Power

work

effect of force over a distance

power

rate of work production

energy

capacity to do work

work (linear)

force causing a change in position

work = force x displacement

if linear pushing force is that angle formula

work = force x cosθ x displacement

work (angular)

effect of torque applied over an angular displacement

angular work = T x Δθ

positive work

when force and displacement are in the same direction

concentric muscle action

negative work

when force and displacement are in opposing directions direction

eccentric muscle action

linear power

rate of linear work production

linear power equations

P = W/Δt

P = F x v

angular power

rate of angular work production

angular power equations

P = torque x angular velocity

P = joint moment x angular velocity

mechanical energy

ability or capacity to do work

energy resulting from motion

translational kinetic energy

energy resulting from linear motion

TKE = ½ mv²

rotational kinetic energy

resulting from angular motion

RKE = ½ Iw²

relationship between work and energy

if objects mechanical energy increases = positive mechanical work was completes

if ME decreases = negative mechanical work was completes

work = Δenergy

gravitational potential energy

capacity to do work due to bodys position within the gravitational field

PE = mgh

law of conservation of energy

total energy of a closed system is snstant if energy does not enter or leave a closed system

total energy = PE + KE

during stance

translational kinetic energy is highest contributor to total energy

during swing

potential energy is highest contripbutor to total energy