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**1. Homework Statement**

The other day, I was asked to conduct an experiment involving momentum. Basically, I set two mini-carts bumper to bumper, and hit a switch that caused them to push away from each other and travel in opposite directions. We then had to repeat the experiment using different weights and such.

Anyway, after collecting the data, my physics teacher wants us to find the force of friction, coefficient of friction, and work done by friction.

**How do I approach these questions?**I already know the carts’ Acceleration, Distance, Time, Initial Velocity, Final Velocity, Mass, Normal Force, and Momentum. Also, is acceleration supposed to be negative in these situations?

**2. Homework Equations**

Momentum = Mass * Velocity

Coefficient of Friction = Normal Force * Force of Frction

Friction = Force Applied from X Direction * (mass * acceleration)

**3. The Attempt at a Solution**

Fn - f = (mass x acceleration)

:18N - f = 1.8kg x -.106m/s^2 ?

::-f = -18

:::f = 18 N

Thanks for the help!