Interaction through application of Forces 2.0

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  • Interaction through application of Forces 2.0
    • Friction
      • a force
      • when 2 surfaces rub each other
      • can be solid, liquid, gaseous
      • Rule
        • opposes motion
        • heats up surfaces
        • Must state between ____and ____
      • Positive effects
        • walk, run,move
        • skateboard move forward
        • Cyclist slow down
        • To write
        • Meteor entering Earth's atmosphere without damaging Earth
      • Negative effects
        • Causes wear and tear
        • speed of swimmer reduced-water resistance
      • Ways to reduce friction
        • Keep surfaces smooth
          • Bowling ball
        • Use ball bearings
          • Machine parts wearing out
        • Applying lubricant
          • Bicycle easy movement
        • Streamlining
          • Aerodynamic
    • Magnetism
      • Non-contact Force
        • Act at a distance
        • Force exerted by magnet
      • Useful Magnetism
        • Needle compass interacts with Earth's magnetic field to help directions
        • Magnetic ***** in fridge keeps it close tightly
        • Magnets in maglev train and tracks repel each other to keep it afloat
    • Gravity
      • Force pulls object to center of earth
      • Exists between 2 objects with mass
      • Non-contact force
        • acts at a distance
          • Moon like Earth can exert gravity
            • Moon is smaller than Earth
              • Moon's gravity 1/6 times of Earth's gravity
                • Causes high tides and low tides on earth
                  • Weight
                    • Amount of gravitational force acting on object
                      • Weight = Mass x Gravitational Field Strength
                  • Gravitational Field Strength
                    • strength of gravitational field in a region
                    • Earth is surrounded by it
  • Jayden 10/7/2018

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