Fmuscle Fweight Figure 2.
The ankle is an example of a class II lever, where the load and the applied force are on the same side of the fulcrum with the load closer to the fulcrum; just like a wheelbarrow (see Fig. 2). When a person stands on their tiptoes, the ball of the foot is the fulcrum, and the weight of the body is the load that acts downward in between the fulcrum and the calf muscle. The calf muscle contracts to generate an upward force that counters the weight of the body. Note that we have omitted the normal force of the ground in the figure because it acts at the fulcrum and thus produces no torque.
Class II levers like ankles and wheelbarrows are useful because they provide
Mechanical advantage comes at a cost. If the output force to input force ratio increases when we use a lever, what decreases?
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