Biomechanics | Torque Problem #1 (Elbow Joint) [Biceps Force, Mech. Adv., Joint Reaction Force]

The video tutorial explores a biomechanics problem involving torque at the elbow joint. It covers calculating the force exerted by the biceps brachii, the mechanical advantage of the biceps, and the joint reaction force. The problem setup includes weights and distances, and the calculations are performed in static equilibrium. The tutorial also discusses the inefficiency of the biceps as a Class III lever and introduces future topics involving trigonometry.

What are the three main calculations involved in the biomechanics problem discussed?

• Force exerted by the deltoid, mechanical advantage, and joint reaction force

• Force exerted by the triceps, mechanical disadvantage, and joint reaction force

• Force exerted by the quadriceps, mechanical advantage, and joint reaction force

• Force exerted by the biceps brachii, mechanical advantage, and joint reaction force

What is the assumed weight of the forearm in the problem setup?

• 5 pounds

• 10 pounds

• 8 pounds

• 12 pounds

How is the force exerted by the biceps brachii calculated?

• By using the sum of forces in the x direction

• By using the sum of torques and setting them to zero

• By using the sum of forces in the y direction

• By using the sum of forces in both x and y directions

What is the approximate force exerted by the biceps brachii in newtons?

• 1,500 newtons

• 1,900 newtons

• 1,717 newtons

• 1,200 newtons

What is the mechanical advantage of the biceps brachii?

• 0.125

• 1.0

• 2.0

• 0.5

Why are biceps considered inefficient muscles?

• They are Class II levers

• They are Class I levers

• They are Class IV levers

• They are Class III levers

What is the role of joint reaction forces in the biomechanics problem?

• To balance forces in static equilibrium

• To generate torque

• To increase mechanical advantage

• To decrease the force exerted by muscles

How is the joint reaction force calculated?

• By summing the forces in the x direction

• By using the mechanical advantage

• By summing the forces in the y direction

• By summing the torques

What is the joint reaction force in the y direction?

• -1,717 newtons

• -1,502.97 newtons

• 1,502.97 newtons

• 1,717 newtons

What must be true for the sum of forces in static equilibrium?

• They must be less than zero

• They must be equal to the sum of torques

• They must be greater than zero

• They must equal zero