Chapter 5

by Robert MacKay

Newton’s Law of Action Reaction (3rd Law)

• You can not touch without being touched

For every action force there is and equal and oppositely directed reaction force

Newton’s 2nd Law Free Body diagrams

A rock in Free Fall

Newton’s 2nd Law Free Body diagrams

A rock in Free Fall

w

Free Body diagramsA rock At the top of its parabolic trajectory (no air resistance)

Free Body diagramsA rock At the top of its parabolic trajectory (no air resistance)

w

Newton’s 2nd Law Free Body diagrams

A rock in Free Fall

w

Newton’s 2nd Law Free Body diagrams

A rock Falling with air resistance

Newton’s 2nd Law Free Body diagrams

A rock Falling with air resistance

w

R

Newton’s 2nd Law Free Body diagrams

A rock on a string

Newton’s 2nd Law Free Body diagrams

A rock on a String

w

T

For the FBD is acceleration, a, up or down ?

Newton’s 2nd Law Free Body diagrams

A rock sliding without friction

Vo

Newton’s 2nd Law Free Body diagrams

A rock sliding without friction

w

N

Newton’s 2nd Law Free Body diagrams

A rock sliding with friction

Newton’s 2nd Law Free Body diagrams

A rock sliding with friction

wW=mg

N

Fk +x

+y