10/7/2023 0 Comments Newtons 3rd law of motion![]() So people often phrase it as, for every action there's anĮqual and opposite reaction. It seems simple, but it's not nearly as simple as you might think. We should talk a little more about Newtons's Third Law, because there are some deep misconceptions that many people have about this law. When you're free falling in the air there is nothing under your feet that would cause the pressure provided by the normal force that's the reason you feel weightless when free-falling and also the reason you feel less heavy in a downward accelerating elevator where the floor is "escaping" from under your feet in the moment of acceleration. İncreased force will put more pressure under your feet and you will feel that as becoming heavier. This extra pressure from increased normal force is the reason we feel heavier when the elevator accelerates upwards. ![]() The floor will begin to push the box upwards with this extra force coming from the motor, as a result the normal force on the box will increase and overcome the weight of the box. If these intermolecular bonds are strong enough, rope won't break and it will transmit the motor's force to the material of the elevator, and from there the force will be transmitted all the way to the floor under the box. When the motor pulls the rope with a certain force and accelerates it upwards, the atoms in the rope will begin to pull each other upwards (with speed of sound) thanks to electrostatic bonds between the molecules of the rope. This extra force coming from motor provides a "net force" upward causing the upward acceleration Ultimately the upward force is provided by the motor pulling the rope attached to the elevator, and it's gonna cause the normal force exerted on the box by floor to increase. The maximum deformation depends of the molecular structure of the material. The wall breaks when the material can no longer withstand the deformation you are causing - you went beyond the maximum deformation of the material. The cause of the wall bending is the force of the kick, and the reaction is the force by the materials being bent, or deformed - pretty much like the force when you push a spring (you cause the spring to deform by pushing it and the materials are struggling to get back to their natural position). When you kick it, the wall actually bends (although this movement is so very small you will only notice it if you use precision instruments). In the example of the wall, when no force is being applied, the wall is completely straight. The moon in fact exerts the same amount of force in the earth, but because the earth is so massive (the mass of the earth is 81 times greater than the moon), the wobbling motion in the earth caused by the moon is very very small (however you can observe the effect force of the moon in the ocean's tides - but this is besides the point) In the example of the earth-moon interaction, the wrong common perception is that the earth is stationary while the moon goes around the earth. You have to think that everything moves, even if the movement is too small for you to notice.
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