# Coëfficient of Kinetic Friction of a Scooter

### Objective:

Calculate the coëfficient of kinetic friction (μk) of a scooter coasting to a stop.

### Plan:

You will have to determine the experimental plan for yourself. Here are some guidelines to help you do that:

• You need to figure out which quantities you need to measure and then measure them.
• The only formula that has μk in it is:

Ff = μkFN

So this means you will need to take measurements in order to calculate Ff and FN.

Note that for your write-up, the sketch of your experimental setup will be the force diagram for the situation in the experiment.

### Class Data:

You should write up the experiment using data from your class:

 Person Class Weight with bike (lb.) Mass with bike (kg) Weight with bike (N) Distance (ft) Distance (m) Time (s) acceleration (m/s2) Friction (N) Coefficient of Kinetic Friction m Fg = FN d t a Ff μk Josh E 198.5 190.7 40 Joe G. E 170 209.6 34 Sylvia E 159.5 112.8 23 Chris E 247.5 229.8 44 Mr. Stretchy A 28 74.0 16.3 Wilson A 194.5 213.0 38.0 Mr. Bigler A 220.5 106.3 30.3 lb. × 2.2046 = kg ft. × 0.3048 = m
Last modified: Thursday, 9 January 2014, 3:55 PM