Physics

Vandebilt Catholic High School

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

Newton's 2nd Law

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  
tan
q = opposite/adjacent = sin q / cos q  (Refers to angles in right triangles.)

R2 = x2 + y2

Pythagorean theorem

p = mv

p = momentum
Momentum is conserved in a closed system.

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

Newton’s Law of Gravity

Fc = kq1q2 / d2

Coulomb’s Law

E = F/q’ ; E = kq / d2

Electric Field Strength