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