A friction force of 52 N acts on a sledge…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A friction force of acts on a sledge. You pull it at a steady speed.
- How much work do you do?
- On smoother snow the friction is only . Over what distance would you do the same work?
Need a reminder? The key ideaShow
Lifting at a steady speed needs a force equal to the weight , so with . Only the height counts, not the path. Pulling along level ground at a steady speed: , with the friction force.
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.
Step 1. (a) .
Step 2. (b) .
Answer: ; .
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