1. Types of Forces Gravity and Friction

2. Forces!!!!! PUSH Or A Pull

3. Types of Forces  Contact Forces  A push or a pull that requires a touch of the object  Weak  Press a key on the key borad    Strong  An Avalanche  Earthquakes  Non Contact Forces  A force applied that does not require touch  Gravity   Magnetic Force   Electric Force 

4. Vector Arrows  Strength  Direction Newtons N SI Unit for Force

5. Gravity Attractive force between objects  Mass   Weight 

6. Friction  Static Friction  Prevents movement  Sliding Friction  Opposes motion Fluid Friction  Friction between a surface and a fluid (liquid or air)

7. Identifying Forces  Balanced Force  Forces acting on an object that combine and form a net force of zero  Object at rest  Moving at a Constant Speed  Unbalanced Force  Forces acting on an object that combine and form a net force that is not zero  Accelerating objects  Speeding up  Slowing down  Changing Direction