Movement Science Quiz 1

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Questions and Answers

What is untrue of arthrokinematic motion?

The fundamental movements are roll, slide, and spin
Motions generally obey the convex-concave rule
Spinning is the primary mechanism for joint rotation when the longitudinal axis of the moving bone intersects the surface of its articular mate at right angles.
Is described by a moving bone on a stationary bone relative to the three cardinal planes. (correct)

Please match each term with its definition

Kinematics = Motion of a body without regard to the forces or torques that may produce the motion Kinetics = Describes the effect of forces on the body Translation = Linear motion in which all parts of a rigid body move parallel to and in the same direction as every other part of the body Curvilinear motion = All parts of a rigid body move along a curved line

Select all that are example of INTERNAL Forces

Muscle contraction (correct)
Force on a limb due to Gravity
Joint reaction force (correct)
mass of a limb

Select all examples of EXTERNAL forces

A resistance band during an exercise. (A), Force on a limb due to Gravity (B), resistance against the limb provided by another person, such as resistance applied to the patient during a manual muscle test (F) Signup and view all the answers

Match each term with the most appropriate answer regarding levers.

Lever Definition = Simple machine of a rigid rod suspended across a pivot point Mechanical Advantage of the muscle = ratio of the internal moment arm to the external moment arm Mechanical advantage of the external resistance = ratio of the external moment arm to the internal moment arm Most common lever class found in the human body = 3rd Class lever It's two features are 1) axis of rotation is located at one end of a bone, 2) the muscle or internal force possesses a greater leverage than the external force. = 2nd Class Lever Signup and view all the answers

Inertia is proportional to the mass of the object, how is "mass moment of inertia" different from "mass"?

Mass Moment of Inertia depends on the distribution of mass from the axis of rotation (B) Signup and view all the answers

Select all true statements regarding Newton's 1st Law

Is commonly called the Law of Interia (A), All linear and rotational velocities are NOT zero, but constant when in dynamic equilibrium (B), All linear and rotational velocities are zero when in static equilibrium (E), All accelerations are zero when in dynamic or static equilibrium. (G), Described by the formula <code>Forces = mass x acceleration</code> (C) Signup and view all the answers

Which is NOT TRUE regarding the Impulse-Momentum relationship?

Impusle is a quantity of motion, where momentum is the force applied over a period of time (C) Signup and view all the answers

Select all true statements regarding Newton's 2nd Law

Described by the formula Force = mass x acceleration (A), Linear acceleration of a body is directly proportional to the force causing it (B), Angular Acceleration of a body around an axis of rotation and is proportional to the torque causing it (C), Angular acceleration of a body around an axis of rotation is directly proportional to the mass moment of inertia of the body (D), Is commonly called the law of acceleration (@) Signup and view all the answers

Select all true statements regarding Newton's 3rd Law

Described by the Formula Force = Mass x Acceleration (A), For every action there is an equal and opposite reaction (B), A ground reaction force exerted simultaneously back on a person during initial contact of gait is an example of an interaction described by this law (C), The force exerted by gravity on the center of mass of the forearm simultaneously as the bicep contracts is an example of an interaction described by this law (D), Is commonly called the law of Action-Reaction (@) Signup and view all the answers

Flashcards

Kinematics

Motion of a body without regard to the forces or torques that may produce the motion.

Kinetics

Describes the effect of forces on the body.

Translation

Linear motion in which all parts of a rigid body move parallel to and in the same direction as every other part of the body.