1. Perform the experiment on the modeling page with surfaces with a known coefficient of kinetic friction. Project the time it will the block to traverse the board length.
2. A problem that is closely related to the one discussed in this section is that of a wheel rotating on an axle. Define a coefficient of kinetic friction (_k) and an initial rotational velocity, then time how long it takes the wheel to come to a complete stop.
3. Frictional force problems are closely related to energy problems. Friction does negative work on a system thereby removing energy from the system.

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