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Kinetic Energy and the Highway Code

VIEWS: 3 PAGES: 11

									POTENTIAL ENERGY & KINETIC ENERGY
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To be able to use the Kinetic Energy and Potential Energy Equations
     FORCES – MOTION - ENERGY



                              Forces
       F = ma
Force = mass x acceleration
                                           ?
                 Motion                Energy
                               ?   Kinetic Energy
                                       Energy of movement
KINETIC ENERGY
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To be able to relate the energy of an object to its motion
ENERGY DEFINITION
             Energy is the capacity to do work

           One example of energy is gravitational
                    potential energy
POTENTIAL ENERGY (PE)

Gravitational potential energy of an object is,

      Potential Energy = Weight x Height
               . GPE = (m.g).h

         Energy = Force x Distance
         Joules = Newtons x Metres
            Metric unit of energy is Joules.
ENERGY CANNOT BE DESTROYED
IT CAN ONLY BE CHANGED
                         PE = 1200 J, KE = 0 J
               6 kg
        10 m




                                                   PE = 600 J, KE = 600 J
 20 m




                                                       Roller
                                                      Coaster


                         PE = 0 J, KE = 1200 J



  Can calculate the kinetic and potential energy of a falling bowling ball
CONSERVATION OF ENERGY

    Conservation of mechanical energy is

            (Potential Energy) + (Kinetic Energy)




       stays constant during motion.

  (as long as no energy is being converted
               to other forms)
CONSERVATION ENERGY
KINETIC ENERGY EQUATION

     Kinetic energy = ½ mass x velocity2
                K.E = ½ mv2
OTHER TYPES OF ENERGY

  There’s also:
Thermal energy
Chemical energy
Electrical energy
Solar energy*
Nuclear energy
  Total energy is conserved, once we account for the
  various different forms it can transform into.

                                 * Actually a form of electrical energy

								
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