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I don't know whether this really is the case. But if it is, I can imagine the moving magnet inducing currents in the pipe, resulting in movement energy being lost. (The currents will induce a magnetic field that opposes the movement.)

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What type of energy is it when you throw a ball upward and it falls?

The ball has both potential energy when it is thrown upward (due to its position) and kinetic energy when it falls (due to its motion). As it falls, potential energy is converted into kinetic energy.


What produces electricity by using a coil of wire and a magnet or steel which produces a magnetic field when electricity flows through the wire?

This is called electromagnetic induction, where a magnet or coil of wire moving relative to each other induces a flow of current in the wire. This process is used in devices like generators to convert mechanical energy into electrical energy.


How can you throw a projectile so that it has zero speed at the top?

To have zero speed at the top, you need to throw the projectile with an initial velocity such that it reaches its maximum height at that point. This requires the initial velocity to be exactly equal to the velocity that would be attained due to gravity when the projectile falls from that height. The angle of projection should be such that the vertical component of the initial velocity cancels out the velocity due to gravity.


Can one re magnetize a magnet?

Yes, a magnet can be ridden of it's magnetic properties by either using it to pick up iron filings or heating it up and rubbing it on another magnet. This is called demagnetizing. On the other hand, magnets can be re-magnetized by heating and holding the south end of a magnet on one end and the north side of another magnet on the opposite end although the magnet will not be as strong as before.


What type of energy transformation occurs when you throw a ball in the air and catch it?

When you throw a ball in the air and catch it, the initial energy transformation is from mechanical energy (kinetic) to potential energy (gravitational potential). When the ball falls back down, the potential energy is converted back to kinetic energy.

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