Are you asking about how a ball would actually rolls uphill? Or are you asking about some optical illusion, where it's not really rolling uphill? I'm not sure what you mean, but I'll explain how a ball could actually roll uphill.
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A ball could have two different types of energy: kinetic energy or potential energy. Kinetic energy is the
energy of motion. If the ball is moving, it has kinetic energy. Potential energy is stored energy, waiting to be used. If a ball is really high, it will have a lot of potential energy.
Picture two hills side by side, with a valley in
the middle ,making a "U" shape. If you place a
ball on the top of the left hill, it is high up,
so it has potential energy. Now, if you allow
it to roll down the hill, it changes that
potential energy into kinetic energy (it
gets less high and starts to roll faster). At
the bottom of the "U", all of the potential
energy has been converted to kinetic energy. As
the ball continues to roll, and roll uphill on
the right hill, it is converting that kinetic
energy back into potential energy
So a ball must have kinetic energy
to roll uphill. A ball that's not moving won't
just start rolling uphill on its own. It
doesn't have the energy. But a moving ball has
kinetic energy, and can roll uphill for a while.
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