Forces and motion: Work, energy, and power Flashcards
1
Q
define work done
A
work done is the force applied multiplied by the distance travelled in the distance of the force
2
Q
what is the general equation for work done
A
W = Fxcosθ
3
Q
what is the principle of the conservation of energy
A
Total energy of a closed system remains constant
4
Q
what is the equation of kinetic energy
A
KE= 1/2 mv^2
5
Q
what is teh equation of gravitational potential energy
A
GPE= mgh
6
Q
Define power
A
Power is the rate of work done
7
Q
if a object is moving with power P and speed v, what is the force exerted on the object
A
F=P/v
8
Q
define efficiency
A
the useful energy output/ total energy input x 100
