Chapter 2 – Part IIForces and Momentum

Forces

• What is a force?

• Four Fundamental Forces in Nature:

Forces

• Forces can act:

– 1 –

– 2 –

Newton’s Laws of Motion

• Sir Isaac Newton:

First Law:

• First Law:

– Basically the law of:

First Law:

• Inertia:

Second Law

• Second Law:

– Can be summed up as:

Second Law

• Can now describe the units of force:

Second Law

• Lets now take a closer look at weight:

– Equation:

– Units:

– What is weight?

Third Law

• Third Law:

– What does this physically mean?

Momentum

• What is momentum?

– Equation:

– Units:

Momentum

• In nature there are many “Laws of Conservation”:

• Law of Conservation of Momentum:

Momentum

• Practical use of the law: