Work Done And Efficiency Flashcards
(7 cards)
1
Q
Work done
A
When energy is transferred, work is done
W=Fxcos○
2
Q
When is work done at a maximum
A
When ○=0
3
Q
Si units of works done
A
W=fxcos○
W=maxcos○
W=kg x ms^2 xm no units
W=kgm²s^-2
4
Q
Principle of conservation of energy
A
Energy cannot be created or destroyed. It can only be transformed from one form to another
DE=w
Efinal-Einitial=w
5
Q
Kinetic energy derivation
A
DE=w
Fxcos●
Fx or fs
Mas (v²=2as)
Mv²/2
DE=1/2 mv²
6
Q
Power
A
The rate of work done
The ratebof energy transfer
P=w/t
P=fx/t p=fv cuz x/t=v
7
Q
Efficiency
A
Useful output / Useful input
