Biomechanics Intro
What describes the point at which an objects mass is equally distributed?
Center of Mass
What broad term describes the study of objects in motion, when acceleration is greater than 0?
Dynamics
What describes how an object responds to stress?
Strain
What is Newton's 3rd law?
Law of Action/Reaction
What term best describes the examination of spatial and temporal components of motion. --> How are things changing with movement?
Kinematics
When we move a heavy object, what happens to our CoM?
It moves close to the edge of support
What are types of mechanical energy?
Kinetic Energy, Gravitational Potential, Potential Strain
What is another name for Newton's Second Law?
Impulse Momentum Theorem
_________ adjust their strength, stiffness, length and yield in response to load
Connective tissues
What describes a objects location in space relative to some fixed point?
Position
Axial or normal stress that tends to pull the object appart at the analysis plane.
Tension Stress
Where does force act on the body?
The Center of Mass/Gravity
What phase of muscle contraction is force generation the greatest?
Eccentric Phase
How are velocity and acceleration related?
Acceleration if the derivative of velocity.
-->Acceleration describes the rate of change of velocity
The ___________ is the perpendicular distance between the line of action of the force and the center of moments.
Moment Arm
"An object stays at rest or in uniform motion in a straight line unless compelled to change by forces acting upon it" describes...
Newtons First Law of Motion
The Law of Intertia
What is the optimal muscle length for force production?
100-120% of the resting length
Kinematics vs Kinetics?
Kinematics is the examination of spatial and temporal components of motion. --> How are things changing with movement?
Kinetics is the study of outside forces acting on the body that can lead to motion.
Why might stress vary in a given object?
Variation in density/structure of the cross sectionss (analysis planes), the force might not be equally applied
What four variables make up the impulse momentum theorem?
Impulse= Force & Time
Momentum= Mass * Acceleration