# All Questions

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### Hard problem of pulleys [closed]

A string passes over a frictionless, massless pulley attached to the ceiling A mass $m_1$ hangs from one end of this string, and a second massless, frictionless pulley hangs from the other end. A ...
1 vote
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### What is the friction coefficient of Object 1 and table top? [closed]

Assume one box with a mass of 1 kg and acceleration of 5.41m/s² to the left. And another box mass of 2kg is hanging on a pulley with a weightless rope. What is the friction coefficient of Object 1 and ...
1 vote
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### Does normal force always point perpendicular to the surface? [closed]

I drew arrow #2 on an AP Physics C assignment, but my teacher said it was wrong and took away a point since it was not perfectly vertical. I feel like it could be arrow #2 though with the information ...
1 vote
13 views

### String taut condition in a Vertical Circular Motion [closed]

Suppose, a ball is tied to a massless string attached to fixed point. In the initial condition, it hangs freely along the vertical in the influence of gravity. Now it is given an initial velocity u in ...
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1 vote
Suppose an ideal Atwood machine is pulled by a constant force $F$ against gravity. I am unable to understand the dynamics of the system. Do the blocks move in such a way that the "increase" ...