2. Monday 1-26-14

3. Great Job on Science Fair Projects!!! I am so proud of you!

4. Science Project Labels & Top 9 spots tetelestai! Congrats to: – Silas Kelley – Neida Del Real – Jada Schumann – Sam Winters – Kayra Foley – Ethan Krafft – Bethleah Schaffer – Saylor Ford – Reillie Smith

5. Elastic Forces An elastic force occurs when a material is stretched or compressed. A diving board exerts an upward elastic force on the diver when it is bent downward. 2.2 Types of Forces

6. Tension A tension force is a pulling force exerted by an object when it is stretched, such as a rubber band. 2.2 Types of Forces

7. Compression A compression force is a pushing force exerted by a material when it is squeezed or compressed. The size of the compression force exerted by a material is equal to the size of the force that compresses the material. 2.2 Types of Forces

8. Normal Forces A normal force is the force exerted by an object that is perpendicular to the surface of the object. 2.2 Types of Forces

9. Normal Forces (cont.) The cup is exerting a downward force on the table, caused by gravity. The table is exerting an upward normal force on the cup, caused by compression. 2.2 Types of Forces

10. Normal Forces (cont.) 2.2 Types of Forces

11. Normal Forces (cont.) 2.2 Types of Forces

12. Forces in the Horizontal Direction Friction balances forces applied in a horizontal direction. Friction equals the horizontal force on an object that is not changing motion. 2.2 Types of Forces

13. Forces in the Vertical Direction Upward normal force balances the downward force of gravity on an object that is not moving vertically. 2.2 Types of Forces

14. Forces in the Vertical Direction (cont.) 2.2 Types of Forces

15. Lesson 2 Review A(n) ____ force is the force exerted by an object that is perpendicular to the surface of the object. Acompression Belastic Cnormal Dtension 2.2 Types of Forces

16. Lesson 2 Review Which force causes a rolling ball to slow down? Asliding friction Bstatic friction Cnormal force Dgravity 2.2 Types of Forces

17. Lesson 2 Review The gravitational force between two objects ____ as ____ increases. Aincreases; distance Bdecreases; mass Cincreases; velocity Ddecreases; distance 2.2 Types of Forces

18. Make a poster of Newton’s 3 laws of motion 1. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it 2. The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma 3. For every action there is an equal and opposite reaction