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.

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Presentation transcript:

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 Review  Energy  Forms of energy  the ability to do work or work being done on an object.  Radiant  Sound  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: media.discoveryeducation.com/videos/10184/s ec9730_256k.asf media.discoveryeducation.com/videos/10184/s ec9730_256k.asfhttp://gtm- media.discoveryeducation.com/videos/10184/s ec9730_256k.asf  Ski jump: media.discoveryeducation.com/videos/10184/s ec9731_256k.asf media.discoveryeducation.com/videos/10184/s ec9731_256k.asfhttp://gtm- media.discoveryeducation.com/videos/10184/s ec9731_256k.asf  Roller Coaster: media.discoveryeducation.com/videos/10184/s ec9733_256k.asf media.discoveryeducation.com/videos/10184/s ec9733_256k.asfhttp://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 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 Describe the car’s motion from figure 1 to figure 2. Figure 1Figure 2

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