Physics Equations

weight

weight

w=mg

units:

• w = N

• m = Kg

• g = N/Kg

hooke’s law

F=ke

Units:

• F = N

• k = N/(c)m

• e = (c)m

Density

D=M/V

units:

• D = g/cm³

• M = g

• V = cm³

pressure

P=F/A

units:

• P = N/m² = Pa

• F = N

• A = m²

moment

M=Fd

Units:

• M = Nm

• F = N

• d = m

Speed

S=d/t

Units:

• S = m/s

• d = m

• t = s

Average velocity

ave v=(u+v)/2

Acceleration

a=(v-u)/t

Displacement

s=(u+v)t/2

Newton’s 2nd law

RF=ma

units:

• RF = N

• m = Kg

• a = m/s²

Work

W=Fd

units:

• W = J

• F = N

• d = m

Kinetic energy

K.E=1/2mv²

units:

• K.E = J

• m = Kg

• v = m/s

Gravitational Potential Energy

P.E=mgh

units:

• P.E = J

• m = Kg

• g = m/s²

• h = m

Efficiency

E=UEO/TEI

Power

P=w/t

units:

• P = Watts

• w = J

• t = s