Pre-lab question Procedure 1: Measuring ?s using the angle of an incline 1. Usin

Question

Pre-lab question

Procedure 1: Measuring ?s using the angle of an incline
1. Using the Felt-Bottomed Cart: Place the first "250 g mass" into the felt-bottomed cart. (The felt is black.) Now:.
· Zero the electronic protractor.
· Place the electronic protractor on the very end of the track, on the end away from the elastic bumper. Place the felt cart on the center of the track.
· Slowly lift the end of the track: you are looking for the maximum angle at which the cart just remains at rest. On your data sheet, record ?max, the angle at which this happens, and its uncertainty.
NOTE: Do this several times to get an accurate value for the angle. Before each
measurement: wipe off the track with the rag. When you at ?max the cart
should be at rest, but if you give it a tiny push the cart slides down the
incline.
· Use this value to calculate ?s, the coefficient of static friction. Use the fact
that, at this angle, the force down along the incline is exactly balanced by
the maximum static friction. You must derive a formula, show the numbers
you substitute and give the value for ?s, with undertainty.
NOTE: The value of ?s does not depend on the mass of the cart!
2. Using the Acrylic-Bottomed Cart: Place the first "250 g mass" into the acrylicbottomed
cart. (The acrylic is white.) Now repeat all the steps from 1. Record
your value for ?s. (Use the formula you derived; you need not show your work).

Question:

If more weight is added to the cart, what happens to ?max(the angle at which the cart just begins to slide) and ?s (the coefficient of static friction between the cart and the incline)?

Can you explain your choice?

max remains the same, Hs increases max decreases, As remains the same @ max increases, As remains the same max increases, ls increases max decreases, us increases e,max decreases, decreases @ max remains the same, els decreases max remains the same, pls remains the same max increas emax increases, us decreases

Explanation / Answer

The coefficient of static friction is independent of the mass of the cart.it just depends on the nature of surface and the nature of materials in contact.

max remains the same, s remains the same.

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