Many students identify the normal contact force as the Newton’s 3rd law pair force to the weight for a book on a table but actually…
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Electricity Refutation Question #3
Students sometimes assume that adding more resistors to a circuit will always increase its resistance. This is not always true because…
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Mechanics Refutation Question #11
It could be argued that when a horse pulls forward on a cart there is always an equal and opposite force backwards so the horse must not be able to accelerate…
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Electricity Refutation Question #4
Students at GCSE often assume that current gets used up as it flows through a lamp but actually…
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Mechanics Refutation Question #12
After GCSE many students assume you find the resultant by adding their magnitude of two vectors together but…
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Electricity Refutation Question #5
Some people think that connecting a second parallel loop in a circuit will reduce the current flowing to the first but actually…
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Mechanics Refutation Question #13
Students often state that after opening their parachute the drag on a skydiver is always greater than before. Actually…
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Electricity Refutation Question #6
Non-physicists might assume that a Vann der Graff dome at 40,000V must be dangerous to a healthy adult but actually…
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Mechanics Refutation Question #14
Work = Force x distance so since the Sun is exerting a force on the Earth and the Earth is moving it could be argued that the Sun must be doing work on the Earth. This is incorrect because…
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EM Refutation Question #1
Sometimes people think that Faraday’s law means that if a coil moves in a magnetic field an EMF is always induced but…