What force must be applied to lift the load?

AI Thread Summary
To determine the force needed to lift an 11.6 kg load using a lever with a fulcrum 1.2 m from the load and 2.4 m from the applied force, both vertical force and torque must be balanced. The lever's distances from the fulcrum are crucial, as one distance can be considered positive and the other negative when calculating torques. The problem simplifies to using these distances to find the required force. Proper application of torque equations will yield the necessary force value. Understanding the lever mechanics is essential for solving this type of problem effectively.
Jtappan
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Homework Statement



A rod is being used as a lever as shown. The fulcrum is 1.2 m from the load and 2.4 m from the applied force. If the load has a mass of 11.6 kg, what force must be applied to lift the load?
____ N

fig-061.gif


Homework Equations



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The Attempt at a Solution



When doing this problem do you need to put the rock as negative radius? or are you using two different equations?
 
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This is a simpler version of the last problem you posted. Read my response to that first. You have to balance both total vertical force AND torque. You can put the center to compute torques from anyplace you want, but the fulcrum is convenient. In which case, yes, one distance is positive and one is negative.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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