Topic 1 Flashcards
Biomechanics definition
synthesis of biology and mechanics that seeks to understand and explain human movement
Biomechanics is used for
9 answers
sports technique, improving performance, predicting performance, monitoring rehab, assessing equipment, designing equipment, postural differences, work environments, preventing injury.
Kinematics
way to describe motion, can be seen.
e.g. displacement, velocity, acceleration: can be linear/angular.
Kinetics
the forces that cause motion, can’t be seen.
e.g. Linear: force
Angular: torques
Scalar
Magnitude only, can be added together.
e.g. mass, distance, speed, time.
Vector
Magnitude and direction, cannot be added together.
e.g. force, displacement, velocity, acceleration.
Qualitative
Description made without use of numbers.
e.g. good, poor, long, heavy, flexed, rotated, spiffy.
Quantitative
Description made with numbers.
e.g. 6 meters, 3 seconds, 50 turns, 2 players, 10 dollars.
Linear motion
Translatory.
all parts of body move through same displacement, in the same direction at the same time.
Angular motion
About an axis.
All parts of body move through the same angle in the same direction, at the same time.
General motion
When there is a combination of linear & angular motion.
the three types of motion are:
linear, angular, and general.
Rectilinear
straight line.
e.g. 100m sprint, 50m swim etc.
Curvilinear
through a curved path.
e.g. long jump, high jump.
Linear displacement
Change in location from initial to final position.
Differs to distance.
Linear velocity
Rate of change in displacement.
Velocity (m/s) = Change in displacement (m) / Change in time (s).
Linear accelaration
Rate of change in velocity
Acceleration (m/s2) = change in velocity / change in time.
Increase in velocity, in a positive direction =
+ acceleration
Decrease in velocity, in a positive direction =
_ acceleration
Increase in velocity, in a negative direction =
_ acceleration
Decrease in velocity, in a negative direction =
+ acceleration
Average velocity defintition
velocity throughout a given time period
Instantaneous velocity defintion
velocity at a precise point in time.
Instantaneous velocity formula
Vi = (Di+1 - Di-1) / (Ti+1 - Ti-1)
V = velocity D = displacement T = time
Instantaneous acceleration formula
Ai = (Vi+1 - Vi-1) / (Ti+1 - Ti-1)
A = acceleration V = velocity T = time
