1. Chapter 3 Notes: Part c

2. Newton’s 2 nd Law Revisited Force = Mass X Acceleration

4. Mass vs Weight Mass is a property Weight changes g = acceleration due to gravity (9.8 m/s 2 )‏ F = mg

5. Friction Revisited Forces resulting from relative motion between objects Work against movement Wear results from grinding of moving parts

6. Types of Friction Air Friction/Resistance Sliding Friction Rolling Friction Viscous Friction – friction within a liquid –Viscosity = resistance to flow

7. Newton’s 3 rd Law For every action, there is an equal and opposite reaction Also known as recoil

10. 3 rd Law Video

11. Momentum Momentum = mass X velocity P = mv Momentum Units: kgm/s Conservation of Momentum – As long as objects are not acted upon by outside forces (like friction), the total momentum won’t change –Newton’s Cradle –Collision Cars