Contact Forces:
- Applied force (hitting a baseball)
- Spring force (a spring in a mechanical pencil causing it to push out lead)
- Drag force (Hangliding)
- Frictional force (Scraping your knee)
- Normal force (putting a pencil on your desk)
Non-Contact Forces:
- Magnetic force (Magnets attracting)
- Electric force (The charge in a lightbulb)
- Gravitational force (Apples falling from a tree
