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The top magnet will be pulled down by Mr. Aitken to touch the bottom magnet.  When it is released, what will happen to the magnetic PE and to the gravitational PE?  What will happen to the elastic PE?  Explain your answers.

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The balloon has been filled with helium.  Is the elastic PE of the ballon high or low?  How could you increase the elastic PE?  How could you reduce it?

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The top and bottom of each magnet have opposite polarities (one is North and the other is South).  The magnetic PE here is decreasing.  Are the magnets getting closer or farther apart?  Is the gravitational PE increasing or decreasing?  Explain your reasons.

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Is the elastic PE high or low in the picture?  How do you know?  Where is the energy stored?

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As the cart is pushed up the ramp, what is happening to its gravitational PE?  When it is released from the top of the ramp, what types of friction will the cart experience?  What energy transformations will happen when the cart is released and rolls down the ramp?