Notebook

NASAPhysics

Online Course

Conservation of Momentum & Energy

Notebook

Notes

• Energy, mass, and momentum are conserved in a closed system.

• Energy can be transformed into different kinds of energy but the total amount remains the same.

• Both KE and PE can be measured in joules or Nm.

• Kinetic energy (KE) is the energy of motion.

• KE = ½ mv²

• Potential energy (PE) is stored energy.

• PE = mgh in a gravitational field.

Equation

TE = PE + KE +

FE + SE

2.1

Equation

KE = ½ mv²

2.3

Equation

KE₁ + PE₁ = KE₂ + PE₂ = KE₃ + PE₃ etc.

2.5

Equation

F_c = ma_c = mv²/r

2.7

Equation

p = mv

2.9

Equation

W = Fd

2.2

Equation

PE = mgh

2.4

Equation

v² = 2g(H-y)

2.6

Equation

h ≥ 2.5r

2.8

Equation

Ft = p

2.10

Equation

L = mvr

2.11