A 50 N force acts at the end of a spanner 0.30 m long…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A force acts at the end of a spanner long. What torque does it give about the nut when the force is
- at right angles to the spanner;
- at to the spanner;
- along the spanner?
Need a reminder? The key ideaShow
Torque about a point: , of size , which is the force times its moment arm (the perpendicular distance from the point to the force's line).
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.
Plan. .
Step 1. (a) .
Step 2. (b) .
Step 3. (c) : no torque.
Answer: (a) . (b) . (c) .
Check. The torque is largest at right angles, as the sine says.
Watch out. In (c) the force pulls the spanner straight off the nut; its line passes through the axis, so it cannot turn it.
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