What is FT in the achilles tendon (pulling upward)?
The Achilles tendon is attached to the rear of the foot as shown in the figure . When a person elevates himself just barely off the floor on the "ball of one foot," estimate the tension FT in the Achilles tendon (pulling upward). Assume the person has a mass of 79kg and D is twice as long as d.
FT= _____________N
Homework Answers
Given that the mass of the person is m = 79 Kg
--------------------------------------------------------------------------
the normal force is acts on the ball of foot . this normal force is equal tothe weight of th e
person . it is acting upwards.
now taking the moments about force Fbthen
Σ τ=0 Fn*2d - Fa*d = 0
Fa = 2Fn
=2*mg
= 2*79Kg*9.8m/s2
=-------- N
now taking the moments about force Fathen
Σ τ=0 Fb*d - Fn*3d = 0
Fb = 3Fn
=3*mg
= 3*79Kg*9.8m/s2
=---------- N
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To understand the two most
common procedures for finding torques when the forces and
displacements are all in one plane: the moment arm method and the
tangential force method. The purpose of this problem is to give you
further practice finding torques in two-dimensional situations. In
this case it is overkill to use the full cross product definition
of the torque because the only nonzero component of the torque is
the component perpendicular to the plane containing the problem.
There...
The tangential force method involves finding the component of
theapplied force that is perpendicular to the displacement from
thepivot point to where the force is applied. This
perpendicularcomponent of the force is called the tangential
force.
(a) What is , the magnitude of the tangential
forcethat acts on the pole due to the tension in the rope?
Express your answer in terms
of and .
When using the tangential force method, you calculate the
torqueusing the equation
,
where is...
In the situation shown in the figure, a person is pulling with a
constant, nonzero force
F?
on string 1, which is attached to block A. Block A is also attached
to block B via string 2, as shown.
For this problem, assume that neither string stretches and that
friction is negligible. Both blocks have finite (nonzero) mass.
Question 1.
Which one of the following statements correctly descibes the
relationship between the accelerations of blocks A and
B?
A.
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