# Homework Help: Output Force of Wheel Axle

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1. Nov 16, 2015

### NatalieWise123

1. The problem statement, all variables and given/known data
You apply a force of 17 N to a wheel with a radius of 0.75 m. If the axle has a radius of 6 cm, what is the output force, assuming the machine operates under ideal conditions?

2. Relevant equations

3. The attempt at a solution
I don't even know how to begin to begin this. Help!

2. Nov 16, 2015

### Mister T

3. Nov 16, 2015

### Isaac0427

Begin with thinking about all the equations you were given in class.

4. Nov 17, 2015

### TeethWhitener

What do you know about angular momentum?

5. Nov 17, 2015

### NatalieWise123

6. Nov 17, 2015

### NatalieWise123

I'm thinking it has something to do with Idea Mechanical Advantage which is output/input I believe.

7. Nov 17, 2015

### TeethWhitener

How about torque? (I probably should have said torque in my first post)

8. Nov 17, 2015

### NatalieWise123

We haven't learned that yet

9. Nov 17, 2015

### TeethWhitener

Hmm. Ok. It is about mechanical advantage. It's just a little easier to understand if you know about torque. No big deal. But gimme a sec to think about how to explain the problem without torque.

10. Nov 17, 2015

### TeethWhitener

Have you gone over concepts such as angular velocity yet?

11. Nov 17, 2015

### Staff: Mentor

You can think of the setup like a lever, with each arm being a radius and the fulcrum being the shared center of rotation (axis). Surely you've covered simple machines like levers?

12. Nov 17, 2015

### NatalieWise123

In a really general sense. I understand it though.

13. Nov 17, 2015

### NatalieWise123

Sort of. Would output force be F2?

14. Nov 17, 2015

### Staff: Mentor

Sure. For a lever, which end is "input" and which is "output" is your choice based on the situation at hand. Base your choice on the scenario presented in the problem statement.

15. Nov 17, 2015

### TeethWhitener

gneill's picture is probably much better help than anything I could put into words.