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