Every action has an equal and opposite reaction. So when the top half of the slinky was dropped, not only did the top half get pulled towards the bottom half, but the bottom half wa being pulled UP at the same time. The force of gravity was pulling at the same rate as the bottom half going up. Giving it the appearance of broken physics.
whoop-de-do, on funnyjuck we all have degrees in pysics dont we? A 7th grader could figure that out, and they arent "physicists". Physicists have better things to do
definitely watched the video of this as a demonstration in my physics class.
basically, the slinky is relaxed to a point where the spring force upward is equal to the gravitational force downward. since the forces are equal, the slinky doesnt move, that is until the rest of slinky collapses on the fixed point.
Hooke's law, the bottom of the slinky has both gravity and an upward acceleration from the spring potential. The top has gravity plus an equal but opposite spring force pulling down. he center has essentially just gravity.
You could say that it's the 2nd law, the sum of the forces on the back end were equal to zero, therefore it had zero acceleration. Then when the tension(is it tension with a coil?) force was taken out, it only had the gravitational force pulling it down, giving it a downwards acceleration.
No, Newton's 1st law. An object at rest will remain at rest until an outside force acts upon it, an object in motion will stay in motion until an outside force acts on it. The outside force here, would be gravity. You would be partially right however in your logic that for every action, there is an equal and opposite reaction, which gave the slinky more hang time.
thanks i get it it a bit better now i was thinking of it like they wernt equal but rather accelerating negatively because the speed upwards was lower than it was downwards
When the string was let go from the top the earth pulled it down and it gained tension, when he lets go from the top the tension from the bottom of the slinky pulls down on the top making the top move down faster than gravity, however if we quote newtons 3rd law of pairs in motion the top must also exert a force in the opposite direction pulling the bottom of the slinky up the same amount that it pulls down this causes the bottom to remain stationary. Whats interesting is if you look at where the centre of gravity is (the point where mass is equal on either side of that said point) you'll notice that it falls down at 9.81ms^2 which is the rate of freefall on earth