Question

The mass of the forearm is about 5. 0 kg and its center of mass is 16 cm from the elbow joint. Ignore the triceps muscle. (figure 1).

Answer 1

The force that the tri ceps muscle exerts on the fore arm when you lift a 17g  with your hand is 1323 N

Data;

• mass = 5kg
• distance of center of mass = 16cm
• g = 9.8m/s^2

Moment of a Force

The sum of moment of a force about a point is equal to zero.

∑m = 0

$x*5 - 17 * 9.8*35 -5 * 9.8 * 16 = 0\\5x - 6615 = 0\\x = 1323N$

The force that the triceps muscle exerts on the forearm when you lift a 17g with your hand. Assuming the is I = 0.35m from the elbow join and the  is d = 0.05m from the joint is 1323N

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