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Questions and Answers
The rotatory component acts parallel to a bony segment.
The rotatory component acts parallel to a bony segment.
False
SW is an example of a resultant force.
SW is an example of a resultant force.
True
The X component of a muscle force is directed perpendicular to the forearm.
The X component of a muscle force is directed perpendicular to the forearm.
False
The Y component of a muscle force is associated with the external moment arm.
The Y component of a muscle force is associated with the external moment arm.
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The magnitude of X and Y force components depends on the position of the limb segment.
The magnitude of X and Y force components depends on the position of the limb segment.
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A higher angle-of-insertion results in increased MY force components.
A higher angle-of-insertion results in increased MY force components.
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A second-class lever compresses and stabilizes the joint.
A second-class lever compresses and stabilizes the joint.
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Mx represents the translatory component that acts parallel to a bony segment.
Mx represents the translatory component that acts parallel to a bony segment.
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A body remains at rest or in constant linear velocity unless compelled by an external force to change its state.
A body remains at rest or in constant linear velocity unless compelled by an external force to change its state.
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In the context of rotational movement, a body remains at rest or in constant angular velocity around an axis unless compelled by an external torque to change its state.
In the context of rotational movement, a body remains at rest or in constant angular velocity around an axis unless compelled by an external torque to change its state.
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In static equilibrium, the velocity of a body is constant.
In static equilibrium, the velocity of a body is constant.
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Dynamic equilibrium refers to the state when the acceleration of a body is zero.
Dynamic equilibrium refers to the state when the acceleration of a body is zero.
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The inertia of a body is inversely proportional to its mass.
The inertia of a body is inversely proportional to its mass.
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Each body has a point called the center of gravity (CoG), which coincides with the center of mass (CoM).
Each body has a point called the center of gravity (CoG), which coincides with the center of mass (CoM).
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The center of mass (CoM) is where the effects of gravity are completely balanced.
The center of mass (CoM) is where the effects of gravity are completely balanced.
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Newton's first law describes the case in which a body is in motion without any external forces acting on it.
Newton's first law describes the case in which a body is in motion without any external forces acting on it.
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In case of linear movement, the linear acceleration of a body is directly proportional to the mass of the body.
In case of linear movement, the linear acceleration of a body is directly proportional to the mass of the body.
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The mass moment of inertia of a body depends solely on the mass of the body.
The mass moment of inertia of a body depends solely on the mass of the body.
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In rotational movement, the angular acceleration is inversely proportional to the torque.
In rotational movement, the angular acceleration is inversely proportional to the torque.
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For linear equilibrium, if the sum of forces acting on a body is zero, then the acceleration of the body will also be zero.
For linear equilibrium, if the sum of forces acting on a body is zero, then the acceleration of the body will also be zero.
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The linear acceleration of a body is inversely proportional to its mass.
The linear acceleration of a body is inversely proportional to its mass.
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If a net force produces acceleration, the body will accelerate in a direction opposite to the resultant force.
If a net force produces acceleration, the body will accelerate in a direction opposite to the resultant force.
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The relationship between force and acceleration in linear movement can be expressed as F = m * a.
The relationship between force and acceleration in linear movement can be expressed as F = m * a.
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Newton's first law states that if a body is in equilibrium, it will accelerate in a direction different from the resultant force.
Newton's first law states that if a body is in equilibrium, it will accelerate in a direction different from the resultant force.
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When the elbow is flexed at 90°, the internal and external forces produce maximal torque.
When the elbow is flexed at 90°, the internal and external forces produce maximal torque.
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Changing the position of the joint alters the external torque but keeps the muscle force the same.
Changing the position of the joint alters the external torque but keeps the muscle force the same.
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Weakness in elbow flexors may lead to difficulty holding an object in position A but not in position B.
Weakness in elbow flexors may lead to difficulty holding an object in position A but not in position B.
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The internal moment arm of a muscle is greatest when the angle-of-insertion of the muscle is 45 degrees to the bone.
The internal moment arm of a muscle is greatest when the angle-of-insertion of the muscle is 45 degrees to the bone.
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In a deep squat compared to a partial squat, the external torque is greater.
In a deep squat compared to a partial squat, the external torque is greater.
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Two applied forces that create a moment have different magnitudes and orientations.
Two applied forces that create a moment have different magnitudes and orientations.
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Pure force couples in the musculoskeletal system result in both translational and rotational motion.
Pure force couples in the musculoskeletal system result in both translational and rotational motion.
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In general, muscles are responsible for producing only translational motion.
In general, muscles are responsible for producing only translational motion.
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Static friction is always greater than kinetic friction.
Static friction is always greater than kinetic friction.
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It requires less force to keep an object in motion than to start it moving.
It requires less force to keep an object in motion than to start it moving.
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Friction always makes it harder to initiate movement than to continue moving an object.
Friction always makes it harder to initiate movement than to continue moving an object.
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Increasing the weight pressing two objects together will decrease static friction.
Increasing the weight pressing two objects together will decrease static friction.
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The upper trapezius and serratus anterior working together is often referred to as a force couple.
The upper trapezius and serratus anterior working together is often referred to as a force couple.
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Friction only occurs when an object is in motion.
Friction only occurs when an object is in motion.
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Kinetic friction is greater than static friction.
Kinetic friction is greater than static friction.
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Adding more weight on top of an object decreases static friction.
Adding more weight on top of an object decreases static friction.
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A force couple can involve muscles with identical magnitudes and orientations.
A force couple can involve muscles with identical magnitudes and orientations.
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