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Ping Pong Poppers Materials • 1 popper • Hard surface • Goggles Flip the disc inside out and set it on a hard surface. WATCH. WHAT HAPPENED?
Energy Forms of energy the ability to do work or work being done on an object. Radiant Sound Thermal Chemical Mechanical Electrical Review
POTENTIAL ENERGY energy of position; stored energy. • Examples • Stretched rubber band • Stacked dominos • Charged battery
KINETIC ENERGY • energy of motion • Examples • A flying rubber band • falling dominos
Video clip examples • Rubber band airplane: http://gtm-media.discoveryeducation.com/videos/10184/sec9730_256k.asf • Ski jump: http://gtm-media.discoveryeducation.com/videos/10184/sec9731_256k.asf • Roller Coaster: http://gtm-media.discoveryeducation.com/videos/10184/sec9733_256k.asf
Properties of Kinetic Energy • The faster the object moves, the more kinetic energy. • Car going 25 kph vs. car going 50 kph • The more mass an object has, the greater the kinetic energy. vs.
LAW OF CONSERVATION OF ENERGY • Energy cannot be created nor destroyed but may be changed from one form to another.
Quiz: A. Energy B. kinetic C. Potential • The ability to do work or work being done on an object is • Energy of position or stored energy • Can depend on height • A flying rubber band • A rubber band stretched or stacked dominos • energy of motion • Based on movement A. Energy C. Potential C. Potential B. Kinetic C. Potential B. Kinetic B. Kinetic
Motion • Motion is the change in position of an object compared to the position of some other object.
Reference Point • Reference point is some thing used to determine if another object is moving.
Reference Point Figure 1 Figure 2 Describe the car’s motion from figure 1 to figure 2.
Reference Point Figure 1 Figure 2 Describe the car’s motion from figure one to figure 2. What is the reference point? How did you use it to describe the motion of the car?
Changes in Motion The motion of objects change when… • the object is speeding up. • the object is slowing down. • the object changes direction. • Unbalanced forces act on an object. Speeding up, slowing down, changing direction is called acceleration.