Work-energy Flashcards
0
Q
Mechanical energy (2 forms)
A
Kinetic energy:1/2mv2
Potential energy:mgh
1
Q
Work-energy theorem
A
Work=/\E
2
Q
Linear energy
A
Work = force x distance Units:joules Rate of work=power Power=W/T P=fd/t P=Fv
3
Q
Angular work
A
Angular equivalent of work Angular W=M/\theta M=moment Eg/net joint moment of 40.5Nm over 0.79 rads W=40.5x0.79 W=32 joules
4
Q
Work-muscle
A
Muscles rotate a segment-mechanical angular work
Positive:
Concentric-muscle shortens as creates force
Negative:
Eccentric:
Muscle lengthens while creating force
5
Q
Angular power
A
Power is work done per unit time Angular power =W//\t Ang work=M/\theta Ang power=M/\ø//\t =mw (units in watts) ⭐️area under power time curve -WORK
6
Q
Positive and negative work
A
Positive work-mechanical energy being put into the system (throw ball) (concentric -muscle shortens as creates force)
Negative work-mechanical energy away from an object (catch ball) eccentric -muscle lengthens while creating force
