S3 Physics Equations Flashcards
1
Q
Moment of a force
NOTE: this is the same as torque
A
Moment = F x Perpendicular distance
If not 90deg angle
Moment = F r sinσ
2
Q
Pressure =
A
Force/Area
3
Q
Stress =
A
Force / Area
4
Q
Strain =
A
= Change in length / Original Length
= e/l
5
Q
SUVAT EQUATIONS (5)
Hints….
v=
v2=
s=
s=
A
v = u + at
v2 = u2 + 2as
s = ut + ½at2
s = ½(u+v)t
6
Q
F =
(N2L)
A
ma
7
Q
Momentum =
A
mv
8
Q
Impulse =
A
Ft
Force * time
(Has units of Ns)
9
Q
Work done (W) =
(What is work done also equal to?)
A
Fs
Work is also equal to the change in kinetic energy
10
Q
Power =
(2 equations for power)
A
P = Fv
P = w/t
11
Q
Impact velocity of an object in free fall?
A
v = ROOT 2gh
12
Q
Resitivity formula
A
R = pl/A
note here that R - resistance and p - resistivity
13
Q
Ohms Law
A
V = IR
14
Q
I =
A
P/V
15
Q
I2 =
A
P/R
