Biomechanics: Chapter 1-Forces

Free-body Diagram

a drawing that only the object in question is drawn along with all the external forces acting on it

vector

a mathematical representation of anything that is defined by its magnitude and direction

Force

a push or a pull

Force Friction

described as dry friction; acts between the non-lubricated surfaces of solid objects in contact and acts parallel to the contact surfaces

Dynamic Friction

dry friction acts between two surfaces that are moving relative to each other

static friction

dry friction acts between two surfaces that are not moving relative to each other

External Forces

forces that act on an object as a result of its interaction witting the environment surrounding it

Concurrent Forces

forces that act through the same point

Internal Forces

forces that act within the object or system whose motion is being investigated

Co-linear Forces

forces that have the same line of action

Contact Forces

forces that occur between objects in contact with each other

static equilibrium

if the object is at rest, the forces are at equalibrium

Friction

is a result from interactions between molecules of the surfaces in contact

Limiting Friction

static friction when we describe the maximum amount of friction that develops just before two surfaces begin to slide

tensile forces

the internal pulling forces

Compressive Forces

the internal pushing forces

Resultant force

the result of vector addition of two or more forces

tension

the structure that is under the tensile forces

Net-force

the vector addition of all the external forces acting on a object