Go to the video: Einstein Rides the Graviton http://serc.carleton.edu/dmvideos/p

Question

Go to the video:

Einstein Rides the Graviton

http://serc.carleton.edu/dmvideos/players/88129.html?hide_banner=true

Watch the video carefully to determine what is going on. Your task is to determine the coefficient of static friction between Einstein and the Graviton.

Use the video experiment to determine the data for this result EXCEPT!!!

There are 12 stationary red lines around the rotating platform.

For your experiment, just when Einstein slides down the wall, assume it took 18 frames of the video for one point on the rotating platform to go from one red line to the next.

The frame rate of the camera is still 240 frames per second.

What is the coefficient of static friction between Einstein and the wall?

Your answer, of course, has not units. It is just a number. Give your answer to three decimal points.

Explanation / Answer

Centrifugal force,

F = m*v^2/r = Normal force, N

Frictional force,

Fr = mu*N = mu*m*v^2/r

mu = Fr / m*v^2/r

Friction force, mass of Einstein is required. Radius..is it in cm??

here, v = (18/240)*12*2*pi*r

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