How Is Upward Force Calculated in a Lever System?

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To calculate the upward force in a lever system, one must consider the distances from the fulcrum and the forces applied. In this case, the thigh muscle generates a force of 400N at a distance of 2cm from the fulcrum, while the weight acts at 40cm. The principle of torque states that the product of force and distance from the fulcrum must be equal on both sides for equilibrium. A diagram illustrating the forces and their respective distances can help clarify the problem. Understanding these concepts is essential for solving the given homework problem effectively.
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Homework Statement



The thigh muscle that bends the knee is attached to the bone 2cm away from the fulcrum and generates a force of 400N. The distance between the weight and the fulcrum is 40cm. Calculate the upward force at the point where the muscle in the thigh contracts.



Homework Equations


No idea, i am really confused.



The Attempt at a Solution


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What can you tell us about torques? Can you sketch a diagram showing the problem statement, and label the forces, where they act, and how they make torques?
 

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