Physics
W. Dupre
Third Quarter Exam
Base Formulas
v = Dd/t |
Average velocity = change in
distance/time |
Dd = (vi + vf)t/2 |
Distance = average velocity times
time. This formula assumes a constant acceleration. vav = (vo
+ vf)/2 |
a = (vf
- vi)/t |
Acceleration equals rate of change in
velocity or change in velocity per unit time. |
2ad = (vf2
- vi2) |
Find displacement when time is not
known. |
d = vit
+ (1/2)at2 |
General formula for distance during
constant acceleration |
F = ma |
|
f = mN |
Force due to friction = coefficient
of friction times the normal force (force pushing the surfaces together). |
W = mg |
Weight (force due to gravity) = mass
x acceleration due to gravity. |
sin q = opposite/hypotenuse cos q = adjacent/hypotenuse |
|
R2 = x2
+ y2 |
Pythagorean theorem |
p
= mv |
p = momentum |
Ft
= Dmv |
Impulse = change in momentum |
Dp1 = Dp2 |
Conservation of momentum |
K
= (1/2)mv2 |
Kinetic Energy |
UG
= mgh |
Potential energy of position |
Us
= (1/2)kx2 |
Elastic potential energy |
W
= Fd |
Work |
SW = DK; SW = DU |
Work – energy theorem |
SE = U + K + Wf |
Net Energy |
SEi = SEf |
Law of Conservation of Energy |
P
= W/t |
Power is rate of doing work |
F
= Gm1m2/d2 |
|
Fc = kq1q2 / d2 |
Coulomb’s Law |
E = F/q’ ; E = kq / d2 |
Electric Field Strength |