Motion

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					Forces and Motion
Ping Pong Poppers

 Materials
  1 popper
  Hard surface
  Goggles
 Flip the disc inside out and set it on a hard
   surface. WATCH.
 WHAT HAPPENED?
    Review
             the ability to do work
Energy       or work being done
              on an object.

               Radiant
Forms of      Sound
energy         Thermal
               Chemical
               Mechanical
               Electrical
     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/s
   ec9730_256k.asf
  Ski jump: http://gtm-
   media.discoveryeducation.com/videos/10184/s
   ec9731_256k.asf
  Roller Coaster: http://gtm-
   media.discoveryeducation.com/videos/10184/s
   ec9733_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.
     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
          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
             What is the reference point?
             from figure one to figure 2.
           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.

				
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posted:5/8/2013
language:English
pages:15
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