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Mechanics

Mechanics Refutation Question #4

Many people think that objects will slow down and come to rest if no resultant force acts upon them but really…

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Mechanics

Mechanics Refutation Question #5

Galileo showed that two balls of different weights accelerate at the same rate when dropped. Before this people thought heavier objects fell faster but this is wrong because…

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Mechanics

Mechanics Refutation Question #6

Some people think the International Space Station has no forces acting upon it because it is in Space, the evidence that they are wrong is…

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Mechanics

Mechanics Refutation Question #7

Some people think that an object’s change in kinetic energy is always equal to its change in gravitational potential energy, this is not always true because…

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Mechanics

Mechanics Refutation Question #8

When a helicopter is hovering it is very common for people to think that the weight of the helicopter has an equal and opposite force that is the down-force from the rotors. This is wrong because…

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Mechanics

Mechanics Refutation Question #9

Many people would assume that when a mosquito is hit by a car the mosquito experiences a much greater force but actually…

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Mechanics

Mechanics Refutation Question #10

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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Mechanics

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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Mechanics

Mechanics Refutation Question #12

After GCSE many students assume you find the resultant by adding their magnitude of two vectors together but…

Categories
Mechanics

Mechanics Refutation Question #13

Students often state that after opening their parachute the drag on a skydiver is always greater than before. Actually…