Biomechanics Key

Biomechanics Key - 1) a)
100
N*m
 
...

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Unformatted text preview: 1) a)
100
N*m
 
 b)
1667
N
 
 c)
3334
N
 
 
 d)

Runner
1’s
foot
rotation
is
50%
runner
2’s
foot
rotation.

Or
runner
2’s
 foot
rotation
is
twice
that
of
runner
1.
 2) B1
=
8N,
B2
=
5N,

Any
justification
that
makes
sense
works
for
the
third
part
 of
the
question.
 
 3) i)

If
the
backback
is
cuboid
in
shape
more
of
the
mass
is
positioned
farther
 away
from
the
Center
of
Mass
which
increases
the
moment
arm
of
the
mass
 and
increases
the
force
the
muscles
have
to
produce
to
counteract
that
 torque
produced
by
the
product
of
the
mass
of
the
books
and
the
moment
 arm.
 
 ii)

Student
holding
the
bag
25
cm
from
midline:
 
 Torque = 
 Student
holding
the
bag
50
cm
from
midline:
 €
 
 
 € Torque = 25cm N × 10 kg × 9.81 = 24.53N ∗ m 
 cm kg 100 m 50cm N × 10 kg × 9.81 = 49.06 N ∗ m 
 cm kg 100 m iii)

By
placing
the
heavy
load
on
top
of
the
head
it
lines
it
up
directly
(or
very
 close)
to
the
center
of
mass
and
decreases
the
moment
arm
of
the
load.
 
 4) 
 
 
 a) b) c) d) e) See
diagram
above
 See
graph
below
 Hip
extension;
knee
flexion,
no
affect
at
the
ankle
 Ankle,
Knee
and
Hip
Flexion
 See
diagram
above
 
 
 
 5) A)
M
should
be
decreased
 
 B)

M
should
be
increased
 6) A)
M2
can
produce
the
most
bite
force
because
it’s
moment
arm
is
the
 largest.
 
 
 B)

The
moment
arm
decreases
in
M1
&
M2

between
figure
closed
and
open.

 The
moment
arm
of
M3
increases
between
the
open
and
closed
position.
 
 In
the
open
position
M3
generates
the
most
torque.
 
 
 
 C)

In
the
closed
position
M3
closes
fastest.

In
the
open
position
M1
closes
 fastest.

The
muscle
that
closes
the
fastest
is
the
muscle
with
the
smallest
 moment
arm.
 ...
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This note was uploaded on 03/29/2012 for the course LS 2 taught by Professor Andrewa.biewener,petert.ellison,anddaniele.lieberman during the Fall '10 term at Harvard.

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