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Problem Solving in Physics
by April Atkin
# Problem Solving in Physics

## Conservation of Energy

### Energy is usually conserved. Carefully note
what kinds of energy you start and finish
with and make them equal to each other.

## Conservation of Momentum

### Are there any eternal forces?

### Are there any eternal torques?

## Formulas

### Check your formula sheet - are there any
formulas that have the variables you need to
solve this problem?

## Trig Identities

### Solving a triangle? Use SOH
CAH TOA to find unknown
quantities

## Sum of the Forces

### Remember, the Sum of the Forces F=ma - if
there is no acceleration, there is no net
force!

### This works for the sum of the
torques too. The sum of the torques
=I(alpha)

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Yes

No, Great! Momentum is conserved, so final momentum=initial momentum!

No, Great! Angular momentum is conserved! Initial=final.

Yes