A 2.5 kg block is thrown along a floor at 7.0 m/s…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A block is thrown along a floor at . The coefficient of kinetic friction is . Taking , find how far it slides and how much heat is produced.
Need a reminder? The key ideaShow
With friction, total energy is still conserved: , and the heat is the work against friction, the path length.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. , , .
Plan. The heat equals the kinetic energy; divide by the friction for the distance.
Step 1. Heat. .
Step 2. Friction. .
Step 3. Distance. .
Answer: It slides and produces of heat.
Check. , with the mass cancelling. Same.
Watch out. The distance does not depend on the mass, but the heat does.
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