Physics Chapter: Center of Mass Movement and Linear Motion
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Questions and Answers

What is the primary focus of center of mass movement?

  • Angular displacement of an object
  • Movement of an object's center of mass (correct)
  • Linear motion of an object
  • Rotation of an object

    • What is measured by the change in orientation of a line segment?

  • Angular displacement (correct)
  • Linear displacement
  • Acceleration
  • Speed

    • What is the unit of measurement for speed in angular motion?

  • Meters per second
  • Degrees per second (correct)
  • Revolution per minute
  • Radians per second

    • What is the rate of change of displacement in a given time?

    <p>Speed</p> Signup and view all the answers

    What is the direction of acceleration in relation to speed?

    <p>The same as speed</p> Signup and view all the answers

    What is the axis of rotation in angular motion?

    <p>An imaginary central line</p> Signup and view all the answers

    What is a characteristic of linear motion?

    <p>All parts of the system move in the same direction at the same speed</p> Signup and view all the answers

    What is the formula for calculating instant speed?

    <p>dS / dt</p> Signup and view all the answers

    What is a common characteristic of voluntary human movement?

    <p>Rotation of a segment of the body about an imaginary axis</p> Signup and view all the answers

    What is the unit of measurement for acceleration?

    <p>Meters per second squared</p> Signup and view all the answers

    What is the study of the forces associated with movement?

    <p>Kinetics</p> Signup and view all the answers

    Which of Newton's laws states that a body at rest remains at rest, or, if in motion, remains in motion at a constant velocity unless acted on by a net external force?

    <p>First law</p> Signup and view all the answers

    What is the type of motion that combines translation and rotation?

    <p>General motion</p> Signup and view all the answers

    What is the main focus of kinesiology and sports science in biomechanics?

    <p>Human body</p> Signup and view all the answers

    What is the branch of physics responsible for analyzing the actions of forces?

    <p>Mechanics</p> Signup and view all the answers

    What is the rate of change of linear impulse of an object proportional to?

    <p>Force causing it</p> Signup and view all the answers

    What type of analysis of human movement focuses on the description of quality without the use of numbers?

    <p>Qualitative analysis</p> Signup and view all the answers

    What is the term for the study of the mechanical aspects of living organisms?

    <p>Biomechanics</p> Signup and view all the answers

    What is the type of motion in which all parts of the body travel the same distance and in the same direction?

    <p>Linear motion</p> Signup and view all the answers

    What is the direction of the rate of change of linear impulse of an object?

    <p>In the same direction as the force</p> Signup and view all the answers

    What is the branch of mechanics that describes the motion of a body without regard to the forces or torques that may produce the motion?

    <p>Kinematics</p> Signup and view all the answers

    What is the result of an interaction between two objects?

    <p>An equal and opposite force</p> Signup and view all the answers

    What type of motion does a soccer ball exhibit when kicked from field to field?

    <p>General motion</p> Signup and view all the answers

    What is the analysis of the trajectory of a body that is in motion over time?

    <p>Kinematics</p> Signup and view all the answers

    What is the concept that describes the body position at a given time?

    <p>Position</p> Signup and view all the answers

    Which of the following is an example of general motion?

    <p>A runner translating along the angular movements of the body segments</p> Signup and view all the answers

    What is the relationship between the force exerted by object A on object B and the force exerted by object B on object A?

    <p>The force exerted by object A is equal to the force exerted by object B</p> Signup and view all the answers

    What is the force that affects the human body from the outside?

    <p>Gravity</p> Signup and view all the answers

    What is the study of the actions of forces that produce motion?

    <p>Kinetics</p> Signup and view all the answers

    What is the term for the study of the motion of a body without considering the forces that produce the motion?

    <p>Kinematics</p> Signup and view all the answers

    What is the primary difference between qualitative and quantitative observations?

    <p>Qualitative observations do not use numbers.</p> Signup and view all the answers

    Who relies heavily on quantitative techniques in their work?

    <p>Biomechanical researchers</p> Signup and view all the answers

    What is one of the purposes of analyzing human movement?

    <p>All of the above</p> Signup and view all the answers

    What is one of the questions that may be asked during a qualitative analysis of human movement?

    <p>Is the movement being performed with the proper force?</p> Signup and view all the answers

    What is one of the benefits of using quantitative techniques in movement analysis?

    <p>It allows for better comparisons between individuals.</p> Signup and view all the answers

    What is one of the applications of quantitative analysis in movement?

    <p>Assessing risk of injury</p> Signup and view all the answers

    What is the primary focus of qualitative analysis in movement?

    <p>Identifying and analyzing problems related to movement</p> Signup and view all the answers

    What is one of the benefits of using qualitative analysis in movement?

    <p>It provides a more detailed description of movement.</p> Signup and view all the answers

    What is one of the ways that quantitative analysis can be used to improve performance?

    <p>By identifying areas for improvement through measurement</p> Signup and view all the answers

    What is the primary goal of analyzing human movement?

    <p>To solve problems related to movement</p> Signup and view all the answers

    Study Notes

    Center of Mass Movement (CoM)

    • Ignores rotation, focuses on rectilinear (1D) or curvilinear (2D or 3D) movement

    Linear Motion

    • Uniform motion of the system, with all parts moving in the same direction at the same speed
    • Also known as translational motion

    Displacement

    • Measures the change of position of an object in space
    • Displacement (S) = final position - initial position
    • Angular displacement: the change in orientation of a line segment

    Speed

    • Measures the rate of change of displacement in a given time
    • Same direction as displacement
    • Units: meters/second (linear) or degrees/second (angular)
    • Average speed = total displacement / total time
    • Instant speed (v) = dS / dt

    Acceleration

    • Indicates the direction and rate of change of speed
    • Units: m/s2 or °/s2

    Angular Movement

    • Rotation about a central imaginary line known as the axis of rotation
    • Almost all voluntary human movement involves the rotation of a segment of the body about an imaginary axis of rotation

    Relationship between Angular and Linear Displacement

    • Considering the same movement time, different points have different linear and angular velocities

    Kinetics

    • Study of the forces associated with movement
    • Newton's laws of motion:
      • First law: law of inertia
      • Second law: law of momentum
      • Third law: law of action-reaction

    General Motion

    • Combination of translation and rotation
    • Examples: soccer ball kicked from field to field, runner translating along the angular movements of the body segments

    Quantitative vs. Qualitative Analysis

    • Qualitative: description of quality without the use of numbers
    • Quantitative: use of numbers to analyze human movement
    • Biomechanics: science that studies the mechanical aspects of living organisms

    Biomechanics

    • Definition: combines the prefix bio with the field of mechanics that studies the actions of forces
    • Studies the mechanical aspects of living organisms, including the human body
    • Includes the analysis of internal forces generated by muscles and external forces affecting the body

    Kinematics

    • Branch of mechanics that describes the motion of a body without regard to the forces or torques that produce the motion
    • Analysis of the trajectory of a body over time
    • Concepts:
      • Body position at a given time
      • Displacement
      • Time
      • Speed
      • Acceleration

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    This quiz covers the concepts of center of mass movement, linear motion, displacement, and speed in physics. Test your understanding of these fundamental principles of motion.

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