20) An ideal spring is hung vertically from the ceiling. When a mass 2.0 kg hangs at rest from it, the spring is extended 6.0 cm from its relaxed length. A downward external force is now applied to the mass to extend the spring an additional 10cm. While the spring is being extended by the force...
Having multiple pulleys reduce the amount of force you have to exert to pull up an object?
why is that exactly?
I mean, I use this principle whenever I encounter a pulley Q...w/o really understanding why that's the case...
Can someone expain in terms of Newtoniam mechanics and/or Free...
Hi,
I believe this is a question that requires a simple explanation without having to do any mathematics.
If people are disregarding this post, simply because it seems as if I am just thrusting the question out there, I am not.
The question is simple. It's a conceptual question.
So...
Homework Statement
http://www.ph.utexas.edu/~cps/physics/powerpoint/Knight_ch15.ppt#282,6,Slide 6
Homework Equations
F2 = (A2/A1) F1
The Attempt at a Solution
I don't see why system 3 requires the same amount of force as system 1.