biomechanics week 1 : linear kinematics and kinetics
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22 Terms
A person with a prosthetic limb weighs 75N. If the force of friction on the person's prosthetic limb is 15N and the normal force is 45N, what is the coefficient of friction?
.3
A person with a prosthetic limb weighs 75N. If the force of friction on the person's prosthetic limb is 15N and the normal force is 45N, what is the coefficient of friction? what equation would you use for this question???
Ff= Fn x coefficent of f
If the ground exerts a vertical force on a runner (magnitude = 2000 N) and the coefficient of static friction between the shoe and the ground is 0.5, what is the maximum horizontal force he can generate under his shoe before slipping?
1000 N
If the ground exerts a vertical force on a runner (magnitude = 2000 N) and the coefficient of static friction between the shoe and the ground is 0.5, what is the maximum horizontal force he can generate under his shoe before slipping? what equation do you use for this question???
GRF x coefficent of f = horizontal force
is this an example of qualitative, quantitive, or semi-quantitative?Pattern of toe clearance during gait
qualitative
is this an example of qualitative, quantitive, or semi-quantitative?Joint Angle measured with Goniometer
Semi-Quantitative
is this an example of qualitative, quantitive, or semi-quantitative?Joint Angle measured with Motion Capture system
Quantitative
If velocity has a positive constant value, then which statement is MOST accurate?
Acceleration is equal to zero
During which segment of the graph is the velocity constant?
c
During which segment of the graph is the velocity positive?
a,b
During which segment of the graph is the velocity negative?
d
What is not always drawn in a Free Body Diagram and needs to consider the context of the question in order to determine inclusion?
force of gravity on segment
external force like GRF
joint reaction force
muscle force
What is always drawn in a Free Body Diagram and does not need to consider the context of the question in order to determine inclusion?
joint axis of rotation
Which of the following is the BEST example of Quantitative Analysis?
Hip internal abduction moment
Based off the information provided in the diagram during the time point from t0 to t1, what is occuring?
the person is moving forward and has a positive acceleration
A ball is kicked at a 35 degree angle with an initial force of 12 N. How much horizontal force is the ball kicked at?
12 cos(35) N
Assuming traditional coordinates, which forces are in the negative direction?
gravity
push off cliff
Assuming traditional coordinates, which forces are in the positive direction?
friction of cliff
pull of rope
Based on the graph, during the time period from t₁ to t₂, what is occuring?
the person is moving forward in a negative acceleration
At t₂, which statement is occuring?
the persons velocity is zero and they are changing direction
During the time period from t₂ to t₃ what is occurring?
the person is moving backward with a negative acceleration
During the time period from t₃ to t₄, what is happening to the person's velocity?
velocity is becoming more positive