## Related questions with answers

Two muscles in the back of the leg pull upward on the Achilles tendon, as shown in given figure. (These muscles are called the medial and lateral heads of the gastrocnemius muscle.) Find the magnitude and direction of the total force on the Achilles tendon. What type of movement could be caused by this force?

Solution

VerifiedWe can immediately see that the problem is textbf{symmetrical around vertical axis}, which means that resulting force will be directed vertically. Total force will be result od combination of $\textbf{projections of both forces on vertical axis}$, horizontal component of total force will be equal to $\textbf{zero}$ because problem is symmetrical around vertical axis. Calculating vertical component of total force:

$F=F_1\cos{\Theta}-F_2\cos{\Theta}=200\cdot \cos{20^o}+200\cdot \cos{20^o}$

$\boxed{F=375.877\,\,\rm{N}}$

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