Forces & Friction - Formula Sheet
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1Forces & Friction - Formula Sheet
Newton’s 2
nd
Law
o F
= mass x acceleration = m * a
net
o If force is gravitational (F
or weight↓),
g
Weight = mass * gravitational acceleration
Weight = m * g
Kinematic Equations (general)
o v
= v
+ at
f
0
2
2
o v
= v
+ 2ad
f
0
2
o d = v
t + ½ at
0
Inclined Plane ( ) - F
vs F
||
f
o F
down plane (causing motion) = mg sin
||
o F
up plane (friction force opposing motion) =
mg cos
f
Friction
o Coefficient
=
Force of friction (F
)
(0 <
<1)
f
Normal force (F
)
N
F
= F
f
N
Net Force (F
)
net
– F
= Fa – μmg
o Flat plane:
F
= F
net
a
f
= mgsinθ = μmgcosθ
o Inclined plane:
F
= F
- F
net
||
f
Pressure
o P = Applied force
area of application
o P = F/A (= mg/A when using a gravity or weight model)
Conversion
2
-4
2
o cm
x 10
= m
2
-6
2
o mm
x 10
= m
Units
o Force
- Newtons
2
o Pressure
- N/m
or Pascals (Pa)
Forces & Friction Formulas
Page 1 of 1
FDHS Physics
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