1. Today’s science starter Day 3: Forces and Motion

2. Contact vs. Noncontact forces
Push or pull on an object that is touching it
Push or pull on an object without touching it
Ex: gravity, friction

3. Calculating net force

4. Net force
Calculated by adding same direction forces and subtracting opposing forces

5. Practice Problems:

6. Practice Problems: Fnet = 5N – 5N = 0

7. Practice problem

8. Practice problem fnet = 600N – 200N = 400N downward

9. Page 34

10. Solution:

11. Motion graphs
Pg 35

12. Page 35

13. Solution:

14. Solution:

15. Page 34

16. Solution