1. FORCES A force to be reckoned with

2. EQ: How do balanced and unbalanced forces affect an object? S8P5.a Recognize that every object exerts gravitational force on every other object and that the force exerted depends on how much mass the objects have and how far apart they are. S8P3.b Demonstrate the effect of balanced and unbalanced forces on an object in terms of gravity, inertia, and friction.

3. AS YOU ENTER Look around the room and think about the objects you see in terms of FORCE. HINT: A force is always exerted by one object to another object. Answer the following: Where do you see a force happening? Which object is exerting the forces? Which is receiving it?

4. Definition of FORCE A push or pull EX: - Using your fingers to pull open books - Pushing buttons on a computer keyboard

5. FORCE Have both size and direction Labeled in units called Newtons (N). Two other concepts that have both size and direction: Velocity Acceleration

6. DEFINITION OF NET FORCE The combination all of the forces acting on an object.

7. Determining the Net Force of an object When forces act in the same direction, you add the forces to determine the net force. The net force will be in the same direction as the individual forces.

8. Determining the Net Force of an object When two forces act in opposite directions, you subtract the smaller force from the larger force to determine the net force. The net force will be in the same direction as the larger force.

9. Balanced Forces When the sum of the forces acting on any object equal to zero, the forces are said to be balanced. Forces are balanced when they are equal in size and opposite in direction. NO CHANGE IN VELOCITY WHEN THE FORCES ARE BALANCED! Constant speed!!!!

10. How is this picture an Example of Balanced Forces?

11. Unbalanced Forces Unbalanced forces occur when the sum of the forces acting on any object is not equal to zero. Unbalanced forces produce a change in motion, such as a change in speed or a change in direction. Unbalanced forces are necessary to cause a nonmoving object to start moving.

12. Examples of Unbalanced Forces Soccer players kicking a soccer ball. -Competing in an arm wrestling competition against a world famous body builder

13. THE BIG IDEA Unbalanced forces cause changes in motion that can be predicted and described.

14. Bibliography Motion basics. (1997). Retrieved from http://www.physics4kids.com/files/motio n_intro.html Force and motion facts. (2013). Retrieved from Force and motion facts. (2013). Retrieved from http://idahoptv.org/dialogue4kids/season 12/force_and_motion/facts.cfm/motion_i ntro.html Force. (2002). Retrieved from http://library.thinkquest.org/CR0215468/f orce_and_motion.htm