1. Forces! By: Matt Abendroth, Nick Hauck, Austin Stevens, Evan Williams

2. Applied Forces A force that is applied by a person or an object. Ex. When a student pushes a desk across a room The force applied is the force exerted on the object or in this case the desk.

3. Noncontact/ Gravity Forces Any force applied to an object by another body that is not in direct contact with it. The most common example of a noncontact force is gravity The units used for this force is jewels Gravity is the force of attraction by which terrestrial bodies tend to fall toward the center of the earth. Gravity keeps all the mass on the earth.

4. Centripetal Forces A force that acts on a body moving in a circular path and is directed toward the center around which the body is moving The formula for centripetal force is a c = v 2 /r

5. Weight vs. Mass Mass is the measurement of the amount of matter something contains Weight is the measurement of the pull of gravity on an object Mass is measured by using a balance comparing a known amount of matter Weight is measured in scale. Ex. If you way 100 pounds that’s your weight The mass of an object doesn’t change when an objects location changes Weight, on the other hand does change with location.

6. Balanced and Unbalanced Balanced forces does not cause a change in motion An example of a balance force is when you have a arm wrestle with someone that is strong as you are and you guys are pushing as hard as you can and your arms stay in the same place. Unbalanced force is always cause a change in motion Unbalanced forces can cause the opposing forces to slow down because of the resistance or other force acting against it An example of an unbalanced force is when you kick a soccer ball your leg has more force than the soccer ball.

7. Newton’s First Law Inertia An object at rest stays at rest and an object in motion stays in motion with the same speed and direction unless acted on by an outside, unbalanced force. http://img.wallpapermenu.com/car-crash- wallpapers_5294_1280x1024.jpg

8. Newton’s Second Law Acceleration The change in velocity with which an object moves is directly proportional to the magnitude of the force applied to the object and inversely proportional to the mass of the object. http://www.google.com/images?um=1&hl=en &rlz=1G1GGLQ_ENUS376&tbm=isch&sa=X &ei=k02rTefELtCtgQeT5qjrCA&ved=0CDM QBSgA&q=newton%27s+second+law&spell =1&biw=1196&bih=611

9. Newton’s Third Law Action/Reaction For every action there is an equal and opposite reaction. http://upload.wikimedia.org/wikipedia/commons/6/6e/ Athena_1_rocket_launching_from_Kodiak_Island.jpg