An experiment is designed to measure the coefficients of static and kinetic fric

Question

An experiment is designed to measure the coefficients of static and kinetic friction using a cart on a level track attached to a hanging weight. We use two different carts- one with an acrylic bottom and one with a felt bottom- which feel different frictional forces as they slide on the track. We will measure the coefficients of friction between these carts and the track.

The track should be wiped with a rag before each measurement in order to?

A) maximize friction

B) ensure consistent measurements

C) apply a thin layer of oil on the track

D) reduce the friction

This is included: "IMPORTANT: Before each measurement, be sure to wipe the track and the bottom of the cart you are using. This will keep the friction from increasing due to dust accumulation."

Explanation / Answer

answer will be b.

i.e. to ensure consistent measurements. because our aim is  to measure the coefficients of static and kinetic friction between cart and track. we dont want dust to play its role.

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