What is the primary reason joint reaction forces produce zero torque?
Biomechanics | Torque Problem #1b (Elbow Joint) [Calculate Joint Reaction Force]

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Science, Physics, Engineering
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
They are too small to have any effect.
They are balanced by other forces in the system.
They are exerted directly on the axis of rotation.
They are always perpendicular to the axis of rotation.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is a joint reaction force necessary in the scenario of holding a 40-pound ball?
To increase the mechanical advantage of the biceps.
To prevent the arm from moving upwards.
To reduce the force exerted by the biceps.
To balance the forces in the X direction.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following forces is NOT considered in the Y direction for calculating joint reaction force?
Force due to the biceps
Force due to the ball
Force in the X direction
Force due to the arm
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the joint reaction force in the Y direction calculated in the video?
178.36 Newtons
-1502.97 Newtons
35.67 Newtons
1717 Newtons
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in solving biomechanics problems involving torque?
Add the torques together and set them to zero.
Identify the forces in the X direction.
Determine the mechanical advantage.
Calculate the joint reaction force.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to calculate muscle force before joint reaction force?
Muscle force is easier to calculate.
Joint reaction force depends on muscle force.
Muscle force is always larger.
Joint reaction force is not always present.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What new concept will be introduced in the next video?
Calculating forces in the X direction.
Changing the axis of rotation.
Increasing the weight of the ball.
Using trigonometry for non-perpendicular angles.
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