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Forces and Motion

Forces and Motion. PART 1. Ping Pong Poppers. Materials 1 popper Hard surface Ping pong ball Hard rubber ball Goggles Flip the disc inside out and set it on a hard surface. WATCH. WHAT HAPPENED?. Ping Pong Poppers +.

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Forces and Motion

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  1. Forces and Motion PART 1

  2. Ping Pong Poppers Materials • 1 popper • Hard surface • Ping pong ball • Hard rubber ball • Goggles Flip the disc inside out and set it on a hard surface. WATCH. WHAT HAPPENED?

  3. Ping Pong Poppers + • Now flip the disc inside out again and quickly put a ping pong ball in the popper. WHAT HAPPENED? • Repeat again with a rubber ball. WHAT HAPPENED?

  4. Energy Forms of energy the ability to do work or work being done on an object. Radiant Sound Thermal Chemical Mechanical Electrical Review

  5. POTENTIAL ENERGY energy of position; stored energy. • Examples • Stretched rubber band • Stacked dominos • Charged battery

  6. KINETIC ENERGY • energy of motion • Examples • A flying rubber band • falling dominos

  7. 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

  8. Properties of Kinetic Energy • The more mass an object has the greater the kinetic energy. • If 2 objects have the same mass, the faster object has more kinetic energy. • Car going 25 kph vs. car going 50 kph vs.

  9. LAW OF CONSERVATION OF ENERGY • Energy cannot be created nor destroyed but may be changed from one form to another.

  10. 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

  11. Motion • Motion is the change in position of an object compared to the position of some other object.

  12. Reference Point • Reference point is something used to determine if another object is moving.

  13. Reference Point Figure 1 Figure 2 Describe the car’s motion from figure one to figure 2.

  14. 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?

  15. 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.

  16. Forces A Force is a push or a pull. • Examples include • Gravity • Contact force • Friction • Magnetic force • Electrical force

  17. Balanced or Unbalanced Forces can be Which side will win?????

  18. Video Clips • Play Push and Pull clip – 3:14 (You may need to log into United Streaming)

  19. Balanced Forces do not change the object’s motion

  20. Start moving Stop moving Change direction Unbalanced Forces cause objects to

  21. When in the opposite direction, the box moves the direction the larger force is pushing. Unbalanced Forces

  22. A push or pull is called a ______ When two equal forces are acting on an object in opposite directions they are _________ forces When forces are unequal they are _________ forces. Forces are described in strength and ________ Force Direction Balanced Unbalanced Quiz

  23. Frayer Models On pages 64 and 65. Complete for homework: Potential Energy Kinetic Energy

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