PHYSICS - CP2 SONG - EQUATION SHEET
Quantity Variable Customary Units Time Δt s seconds Position
Initial Position dI m meters
Final Position dF m meters Displacement Δd m meters Velocity
Initial Velocity vI ms meters/second
Final Velocity vF ms meters/second
Average/Constant Velocity vavg m
s meters/second
Acceleration In this class it will always be constant
Acceleration a 2m
s meters/second2
The acceleration due to gravity on Earth is ALWAYS the same. ag = - 9.8 m/s2
F Id d d∆ = −
avg
dv
t
∆=∆
2 2
2
2
1
2
F I
F I
I
v v a t
v v a d
d v t a t
= + ⋅∆
= + ⋅ ⋅ ∆
∆ = ⋅∆ + ⋅ ⋅ ∆
KINEMATICS EQUATIONS
PHYSICS - CP2 SONG - EQUATION SHEET
MOMENTUM m vρ = ⋅ Units: kg∙m/s
IMPULSE f iρ ρ ρ∆ = −
Conservation of Momentum for Collisions of Objects A and B
B A before B before A after afterρ ρ ρ ρ+ = +
ALL types of collisions conserve momentum
WORK – Units: Joules LIFT PUSH/PULL No Work Done
2
9.8 m/s
g
g
g
W F d
W m a d
a
= ⋅
= ⋅ ⋅
=
AW F d= ⋅
ENERGY Units: Joules Potential Kinetic Total Conservation of Energy for Rollercoaster at track points A & B Conservation of Energy for Rollercoaster on tracks at points A and B
������������ = �� + �� = �� + �� In particular ���� = ������� Conservation of Energy for ELASTIC Collisions of Objects A and B
B A before B before A after afterKE KE KE KE+ = +
UNIVERSAL GRAVITATIONAL FORCE
1 2
2g
m mF G
r
⋅=
m is mass in kilogram (kg),
r is distance between the two objects in meters (m)
G is a gravitational constant (6.67 x 10-11
N m2/kg
2)
This force is ALWAYS ATTRACTIVE
ELECTRIC FORCE
1 2
2E
q qF K
r
⋅=
q is charge in Coulombs (C),
r is distance between the two objects in meters (m)
K is a constant (9 x 109 N m
2/C
2).
Opposite Charges will ATRACT.
Same Charges will REPEL
FORCES Equation: FNET = m∙a
Weight Fg = m ∙ag
All masses are in kg All Forces are in Newtons
Forces to Include on Free Body Diagram (Force Diagram)
• Force of Gravity – Fg
• Normal Force – FN
• Frictional Force – Ff
• Applied Force – FA
Carry (flat surface) Glide, Coast (a=0m/s2) No motion (d = 0 m)
Important Masses Mass of Electron (mE) = 9.11 x 10-31 kg Mass of Proton (mP) = 1.68 x 10-27 kg
Important Charges Charge of Electron (qE) = -1.6 x 10-19 C Charge of Proton (qP) = +1.6 x 10-19 C
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