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Questions and Answers
What is the primary focus of center of mass movement?
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?
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?
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?
What is the rate of change of displacement in a given time?
What is the direction of acceleration in relation to speed?
What is the direction of acceleration in relation to speed?
What is the axis of rotation in angular motion?
What is the axis of rotation in angular motion?
What is a characteristic of linear motion?
What is a characteristic of linear motion?
What is the formula for calculating instant speed?
What is the formula for calculating instant speed?
What is a common characteristic of voluntary human movement?
What is a common characteristic of voluntary human movement?
What is the unit of measurement for acceleration?
What is the unit of measurement for acceleration?
What is the study of the forces associated with movement?
What is the study of the forces associated with movement?
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?
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?
What is the type of motion that combines translation and rotation?
What is the type of motion that combines translation and rotation?
What is the main focus of kinesiology and sports science in biomechanics?
What is the main focus of kinesiology and sports science in biomechanics?
What is the branch of physics responsible for analyzing the actions of forces?
What is the branch of physics responsible for analyzing the actions of forces?
What is the rate of change of linear impulse of an object proportional to?
What is the rate of change of linear impulse of an object proportional to?
What type of analysis of human movement focuses on the description of quality without the use of numbers?
What type of analysis of human movement focuses on the description of quality without the use of numbers?
What is the term for the study of the mechanical aspects of living organisms?
What is the term for the study of the mechanical aspects of living organisms?
What is the type of motion in which all parts of the body travel the same distance and in the same direction?
What is the type of motion in which all parts of the body travel the same distance and in the same direction?
What is the direction of the rate of change of linear impulse of an object?
What is the direction of the rate of change of linear impulse of an object?
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?
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?
What is the result of an interaction between two objects?
What is the result of an interaction between two objects?
What type of motion does a soccer ball exhibit when kicked from field to field?
What type of motion does a soccer ball exhibit when kicked from field to field?
What is the analysis of the trajectory of a body that is in motion over time?
What is the analysis of the trajectory of a body that is in motion over time?
What is the concept that describes the body position at a given time?
What is the concept that describes the body position at a given time?
Which of the following is an example of general motion?
Which of the following is an example of general motion?
What is the relationship between the force exerted by object A on object B and the force exerted by object B on object A?
What is the relationship between the force exerted by object A on object B and the force exerted by object B on object A?
What is the force that affects the human body from the outside?
What is the force that affects the human body from the outside?
What is the study of the actions of forces that produce motion?
What is the study of the actions of forces that produce motion?
What is the term for the study of the motion of a body without considering the forces that produce the motion?
What is the term for the study of the motion of a body without considering the forces that produce the motion?
What is the primary difference between qualitative and quantitative observations?
What is the primary difference between qualitative and quantitative observations?
Who relies heavily on quantitative techniques in their work?
Who relies heavily on quantitative techniques in their work?
What is one of the purposes of analyzing human movement?
What is one of the purposes of analyzing human movement?
What is one of the questions that may be asked during a qualitative analysis of human movement?
What is one of the questions that may be asked during a qualitative analysis of human movement?
What is one of the benefits of using quantitative techniques in movement analysis?
What is one of the benefits of using quantitative techniques in movement analysis?
What is one of the applications of quantitative analysis in movement?
What is one of the applications of quantitative analysis in movement?
What is the primary focus of qualitative analysis in movement?
What is the primary focus of qualitative analysis in movement?
What is one of the benefits of using qualitative analysis in movement?
What is one of the benefits of using qualitative analysis in movement?
What is one of the ways that quantitative analysis can be used to improve performance?
What is one of the ways that quantitative analysis can be used to improve performance?
What is the primary goal of analyzing human movement?
What is the primary goal of analyzing human movement?
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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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