U1 Equations Flashcards
1
Q
Momentum
A
p =mv
2
Q
Linear momentum (before and after a collision)
A
Total initial momentum = total final momentum
ma ua + mb ub = ma va + mb vb
3
Q
Explosions
A
-ma va = mb vb
4
Q
Impulse (momentum)
A
Delta p = f x t
f = mv - mu /t
5
Q
Momentum of objects that combine
A
ma ua + mb ub = (ma + mb)v
6
Q
Work
A
W = f s
7
Q
GPE
A
GPE = mgh
8
Q
Mechanical energy
A
GPE + ke
9
Q
Work done (with ke of object before and after)
A
f s = 0.5 m v^2 - 0.5 m u^2
10
Q
Power (energy and force equations)
A
P = e/t
P =f v
11
Q
Current
A
Q =It
12
Q
Voltage (energy) (power)
A
V = E/Q
P =IV
13
Q
Charge (electrons)
A
Q = ne
e = 1.6 x10^-19
14
Q
Resistance (voltage) (power)
A
V = IR
P = I^2R
15
Q
Resistivity
A
R = pL/A
p = Resistivity
R = resistance
L = length of material (usually 1m)
A =area of material
