Module 7: Friction Flashcards
sometimes called Coulomb
friction
dry friction
When a body is about to
slide down on the inclined plane, the angle
of inclination of the inclined plane is called
angle of repose
object in motion (less than
the static friction)
kinetic friction
it is a force that resists the movement of two contacting surfaces
that slide relative to one another
friction
angle made by the
resultant of static friction and normal
reaction.
angle of static friction
occurs between the contacting
surfaces of bodies when there is no
lubricating fluid
dry friction
angle made by the
resultant of kinetic friction and normal
reaction.
angle of kinetic friction
2 types of dry friction
- static friction
- kinetic friction
Also known as “drag” or on aircraft
it is know as “air resistance”.
fluid friction
where does fluid friction depend?
- viscosity
- shape of the object in motion
- speed of the object and the fluid
happens with liquids and
gases
fluid friction
Depends on
viscosity, shape of the object in motion
and the speed of the object and of the
fluid
fluid friction
This force always acts tangent to the
surface at the points of contact and is directed so as to oppose the
possible or existing motion between the surfaces
friction
2 types of friction
- dry friction
- fluid friction
3 types of angles of friction
- angle of static friction
- angle of kinetic friction
- angle of repose
is a simple machine that is
often used to transform an applied
force into much larger forces, directed
at approximately right angles to the
applied force
wedges
object is at rest “equilibrium”
(or before impending motion)
static friction
