Torque & Equilibrium Video Lessons

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Problem: A ball of radius r with a wire glued to one spot on its surface can be pulled along the floor and will slide without any tendency to roll only if the wire is horizontal and is a distance h above the floor. In terms of F, the magnitude of the applied force, fk, the magnitude of the force of kinetic friction, and the radius r of the ball, what is h? 1. h = r (f k − F) 2. h = 0; the wire must run along the floor. 3. h = r (f k/F) 4. h = r 5. h = r (1 + F/f k) 6. h = r (F − f k) 7. h = r (F/f k) 8. h = r (1 − f k/F) 9. h = r (1 + f k/F) 10. h = r (1 −F/f k)

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Problem Details

A ball of radius r with a wire glued to one spot on its surface can be pulled along the floor and will slide without any tendency to roll only if the wire is horizontal and is a distance h above the floor. In terms of F, the magnitude of the applied force, fk, the magnitude of the force of kinetic friction, and the radius r of the ball, what is h?

1. h = r (f k − F)

2. h = 0; the wire must run along the floor.

3. h = r (f k/F)

4. h = r

5. h = r (1 + F/f k)

6. h = r (F − f k)

7. h = r (F/f k)

8. h = r (1 − f k/F)

9. h = r (1 + f k/F)

10. h = r (1 −F/f k)

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Torque & Equilibrium concept. You can view video lessons to learn Torque & Equilibrium. Or if you need more Torque & Equilibrium practice, you can also practice Torque & Equilibrium practice problems.

How long does this problem take to solve?

Our expert Physics tutor, Jeffery took 4 minutes and 21 seconds to solve this problem. You can follow their steps in the video explanation above.