Principles Of Biomechanics Flashcards
What is biomechanics
Study of human movement from the perspective of art and sciences, the study of the mechanical laws relating to the movement or structure of living organisms
What are we interested in for biomechanics
Motion force and response
Kinematics is
The geometry of the motion of objects, including displacement velocity and acceleration without taking into account the force that produce the motion
Kinetics is?
The study of the relationships between the force system acting on a body and the changes it produces in body motion
Key principles
Statics/dynamics, kinematics/kinetics, scalars/vectors, qualitative/quantitative, newtons laws
Static system is?
A system in a constant state of motion, at rest or moving with a constant speed and direction
Dynamic system is?
Systems in which acceleration is present
Qualitative
Measuring the quality of something , video analysis
Quantitative
Measuring the quantity of something, force plates motion analysis, emg etc
Kinematics/ kinesiology
Concerned with the description of motion as a function of space and time with no reference to causes of motion, stride length, athlete speed
Kinetics
The relationship between the forces acting on a system and the resulting motion of the system, force between feet and ground, linear, torques, impulse, power
Describe movement
Linear, angular, general (complex)
Displacement is
A vector which points from the initial position of an object to its final position (m)
Velocity is
Speed in a given direction metres per second
Acceleration is
A vector which shows the direction and magnitude of changes in velocity metres per second per second
A= (v1-v2)/t
Force is
A push or pull and it changes the motion of a body segment, f=m*a, internal and external forces, internal muscles, external friction air resistance thrust gravity
Muscle forces - the amount of force is relative to what?
Body type and limb length, muscle fibre type, motor unit firing, pennation angle
Newtons laws describe?
How things move
Newtons 1st law
Law of inertia - Body at rest or moving at a constant velocity will continue in the same state unless acted on by an external force
Newton’s second law
Acceleration- the acceleration of a body is in the same direction and is proportional to the force causing it and inversely proportional to the mass of the body f=m*a
Mass
Quantity of matter measured in kg, mass is not the same as weight, mass is a measure of inertia
Weight is
Measured in newtons. F= m* gravity (9.8)
Newtons 3rd law
Reaction - for every force exerted by one body on another there is a concurrent force equal in size but opposite in direction exerted by the second body on the first
