Biomechanics Theory and Concepts Flashcards
(13 cards)
what is a force? and what is a forced measured in?
a force is a push or pull and it is measured in newtons
what are the three newtons laws?
law of inertia, acceleration, action-reaction
define inertia
the property of matter that causes an object to resist any changes in motion.
constant velocity = constant speed, unchanging direction
define acceleration
newtons formula (Fnet = ma) describes the relationship between the net force acting on an object (Fnet), it’s masses (m), and its acceleration (a)
define action-reaction
a reaction force arises whenever one body exerts a force on another. the reaction force is equal and opposite in magnitude and direction applied to the force.
examples of inertia in sports
a curling rock gliding down ice tends to stay in motion for a long time, eventually the rock will slow down because of friction from the ice, but if there was no friction the rock would glide forever
examples of acceleration
in football when more weight is added onto a blocking shield, the player must create more force in order to move the shield
examples of action reaction
when you dive off of a diving board, you push down on the springboard, the board forces back and pushes you up into the air
what is a class one lever?
the fulcrum is located between the effort and the load. an example in the human body would be the neck
what is a class two lever?
the load is between the effort and the fulcrum. an example in the human body would be the ankle joint
what is a class three lever?
the effort is located between the fulcrum and the load. an example in the human body would be a bicep curl
what is linear motion?
linear motion takes place when a body or its collective parts move at the same distance, in the same direction, in the same amount of time
define angular motion
the force acts through the centre of the object but is off centre which results in rotation
