Physics: Neat little demonstration of relative motion

A nice demonstration of basic physical laws. From MIT news (via Reddit): A cart moving at constant velocity shoots a ball straight upwards. Since the ball has the same translational velocity as the cart, it is caught when it comes back down.
kronosposeidonsays...

I hear you, but this demonstration might have been for their students in a Physics 101 class. Gotta start somewhere, and not all students at MIT are there for physics or engineering degrees who'd probably have this background knowledge before they arrived. >> ^EmptyFriend:

While it is a good demonstration.... "From MIT news" ? MIT teaches middle schoolers now or what?

GeeSussFreeKsays...

>> ^kronosposeidon:

I hear you, but this demonstration might have been for their students in a Physics 101 class. Gotta start somewhere, and not all students at MIT are there for physics or engineering degrees who'd probably have this background knowledge before they arrived. >> ^EmptyFriend:
While it is a good demonstration.... "From MIT news" ? MIT teaches middle schoolers now or what?



In addition, without air resistance, the cart is traveling along the surface of the earth which is curved, the balls path would also curve but at a larger arc relative to the cart. This would cause it to have to travel a longer path, and would no longer be able to catch the cart.

Jinxsays...

If the golfball left the cart at high enough velocity then it would never come back.

but if it left at an even higher velocity, then it might just come back before it left.

Basically, conducting science is always about making sure that you materialise an equal amount of golfballs to the ones you lose...or there will be TERRIBLE consequences for the time space continuum...and thats why this is demonstrated at MIT.

Paybacksays...

>> ^Jinx:
If the golfball left the cart at high enough velocity then it would never come back.
but if it left at an even higher velocity, then it might just come back before it left.
Basically, conducting science is always about making sure that you materialise an equal amount of golfballs to the ones you lose...or there will be TERRIBLE consequences for the time space continuum...and thats why this is demonstrated at MIT.


It's when the golf ball is on the tee as WELL as in the hole that fucks me up.

bmacs27says...

>> ^SlipperyPete:

>> ^BoneRemake:
at what point does height have a negative effect on the situation ?

Probably when sufficient air resistance is introduced.
timeshift


I think the greater concern is the friction slowing down the cart (which is likely much more significant than the drag on the golf ball from wind resistance). Notice that the ball already lands towards the leading edge of the cup because the cart has slowed down a little bit.

siftbotsays...

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