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Transcript
Forces! QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. By: Matt Abendroth, Nick Hauck, Austin Stevens, Evan Williams 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. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. 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. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. 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 ac = v2/r QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. 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 • QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. 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. 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. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. 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. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTime™ and a decompressor are needed to see this picture. http://img.wallpapermenu.com/car-crashwallpapers_5294_1280x1024.jpg 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. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. 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 QuickTime™ and a TIFF (Uncomp resse d) de com press or are nee ded to s ee this picture. Newton’s Third Law Action/Reaction • For every action there is an equal and opposite reaction. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. QuickTime™ and a decompressor are needed to see this picture. http://upload.wikimedia.org/wikipedia/commons/6/6e/ Athena_1_rocket_launching_from_Kodiak_Island.jpg