Power Flashcards
1
Q
How to solve power question?
A
Form 2 equations, then solve simultaneously.
I) P = Fv, where F is the driving force, D
II) Constant speed (equilibrium), or F = ma
2
Q
How to solve elastics question?
A
Form 2 equations, then solve simultaneously
I) T = lambdax / l
II) a) At rest, equilibrium forces balanced
b) Accelerating, F = ma, where F is the rsultant.
3
Q
When is max velocity in elastics?
A
When a = 0, i.e at its equilibrium position
4
Q
When is max acceleration in elastics?
A
WHen v = 0, i.e, just after it is released.
5
Q
KE
A
1/2 m v^2
6
Q
GPE
A
mgh or mgdsin(theta)
7
Q
EPE
A
(lambda x^2)/ 2l
8
Q
Work Done…
A
F x d
9
Q
Work-Energy Principle
A
KE + GPE + EPE + work done by engine/person = KE + GPE + EPE + work done against friction
10
Q
Impulse-momentum principle
A
I = m(v-u)
11
Q
A
