Mechanical Analysis Exam 4 For better
grade A+
forces internal to a system do not change the momentum of or perform work on that
system
true
internal forces and relationship with total momentum
total momentum won't change, but momentum of each body or segment can change (if
one increases the other decreases)
elastic collisions
a collision where two objects bounce off each other without deformation or loss of heat
inelastic collisions
a collision in which two objects stick together after they collide
conservation of energy
in all collisions, total energy and momentum are always conserved
in elastic collisions kinetic energy is __________
conserved
in inelastic collisions kinetic energy is __________________
not conserved
in elastic collisions kinetic energy is conserved with no change in ___________
momentum
during perfect elastic collisions, what happens?
relative velocity remains the same
relative velocity is independent of the mass
Coefficient of Restitution (e)
measure of elasticity of a collision between two objects
values range from 0-1
, in a perfectly elastic collision what does e =?
1
in a perfectly inelastic collision e =?
0
the more elastic the coefficient is the greater the _________ will be
velocity
momentum is conserved in every _________
plane
Because energy is a scalar quantity it does not occur in ___________________
different planes
effective mass
the portion of a body's mass that is involved with a collision
what is effective mass essentially?
mass of an imaginary rigid body that replaces the body and it has the same speed as the
body part involved in the collision
when analyzing multi-segmented bodies you must be more explicit
true
for most striking athlete motions (baseball, golf, tennis etc.) there must be a large
impact by transferring a large amount of ____________ to the object being struck
momentum
tissue mechanics
mechanics of materials of human connective tissue such as bones, ligaments, cartilage,
tendons
load
an externally applied force
how an object responds to a load is determined by?
magnitude, location, direction, duration, frequency, variability, rate
grade A+
forces internal to a system do not change the momentum of or perform work on that
system
true
internal forces and relationship with total momentum
total momentum won't change, but momentum of each body or segment can change (if
one increases the other decreases)
elastic collisions
a collision where two objects bounce off each other without deformation or loss of heat
inelastic collisions
a collision in which two objects stick together after they collide
conservation of energy
in all collisions, total energy and momentum are always conserved
in elastic collisions kinetic energy is __________
conserved
in inelastic collisions kinetic energy is __________________
not conserved
in elastic collisions kinetic energy is conserved with no change in ___________
momentum
during perfect elastic collisions, what happens?
relative velocity remains the same
relative velocity is independent of the mass
Coefficient of Restitution (e)
measure of elasticity of a collision between two objects
values range from 0-1
, in a perfectly elastic collision what does e =?
1
in a perfectly inelastic collision e =?
0
the more elastic the coefficient is the greater the _________ will be
velocity
momentum is conserved in every _________
plane
Because energy is a scalar quantity it does not occur in ___________________
different planes
effective mass
the portion of a body's mass that is involved with a collision
what is effective mass essentially?
mass of an imaginary rigid body that replaces the body and it has the same speed as the
body part involved in the collision
when analyzing multi-segmented bodies you must be more explicit
true
for most striking athlete motions (baseball, golf, tennis etc.) there must be a large
impact by transferring a large amount of ____________ to the object being struck
momentum
tissue mechanics
mechanics of materials of human connective tissue such as bones, ligaments, cartilage,
tendons
load
an externally applied force
how an object responds to a load is determined by?
magnitude, location, direction, duration, frequency, variability, rate
