Force is a vector meaning?
it possesses both
magnitude and direction
N E W TO N ‘ S F I RS T L A W O F MOT I O N ( I N E RT I A )
An object at rest remains at rest, and an object in motion remains in motion at a constant, linear velocity unless acted on by external forces
If ∑F = 0 then
∆v = 0
acceleration due to gravity on earth
9.81 m/s^2
acceleration due to gravity on moon
1.625 m/s^2
Bodyweight (N) =
m*a due to gravity
Mechanotransduction
The cell-signaling response to
mechanical loading
Newtons second law (acceleration)
The acceleration of a system depends on the mass of the system and the amount of force applied
∑F =
m*a
Newtons third law (Action-reaction)
For every action theres an equal and opposite reaction
Deformation
change in shape
Yield point
point where
deformation is permanent
Mechanical failure
loss of
continuity
Draw the graph for rubber band - Tendon or muscle
Check PP
Draw the graph for glass bottle - bone
check PP
Draw regular mechanical unloading
check PP
friction
Force acting over area of contact between two surfaces in the
direction opposite to that of motion or motion tendency
Static friction
friction between two surfaces of objects that
are not moving
Kinetic friction
friction between two surfaces of objects that
are in motion
In order to move an object, the applied force must
be greater than
the frictional force
FNet =
FApplied + (-fk)
Fnet also equals
ma
fk =
ukN
W =
-N (only on leveled surface)