calculate the linear (tangential) velocity and centripedal acceleration of a bal
ID: 1579594 • Letter: C
Question
calculate the linear (tangential) velocity and centripedal acceleration of a ball kicked at the end of hip flexion. Use hip flexion velocity and leg length as radius for both participant. Compare the two.
Data Collected:
Joint Motion
Participant 1
Participant 2
Range of motion (degrees)
Limb length (m)
Time (s)
for 10 mvmts
Range of motion (degrees)
Limb length (m)
Time (s)
for 10 mvmts
Shoulder abduction
165 (goniometer)
171.0
(Dartfish)
.68m
0.3
160
(goniometer)
163.3
(Dartfish)
.86m
0.72
Straight leg flexion
90
(goniometer)
98.7
(Dartish)
.85m
0.52
95
(goniometer)
110.8
(Dartfish)
1.04m
0.82
Angular Velocity (Calculate using time for 1 full movement):
Joint Motion
Participant 1 (degrees/sec)
Participant 1 (radians/sec)
Participant 2 (degrees/sec)
Participant 2 (radians/sec)
Shoulder Abduction/Adduction
550 degrees/sec (goniometer)
570 degrees/sec
(Dartfish)
9.6 rad/ sec
(goniometer)
9.93 rad/sec
(Dartfish)
222.2 degrees/sec
(goniometer)
226.8 degrees/sec
(Dartfish)
3.88 rad/sec
(goniometer)
3.96 rad/sec
(Dartfish)
Straight Leg Flexion/Extension
173.1 degrees/ sec
(goniometer)
189.8 degrees/sec
(Dartfish)
3.02 rad/ sec
(goniometer)
3.31 rad/sec
(Dartfish)
115.9 degree/sec
(goniometer)
135.12
degree/sec
(Dartfish)
2.02 rad/sec
(goniometer)
2.36 rad/sec
(Dartfish)
Joint Motion
Participant 1
Participant 2
Range of motion (degrees)
Limb length (m)
Time (s)
for 10 mvmts
Range of motion (degrees)
Limb length (m)
Time (s)
for 10 mvmts
Shoulder abduction
165 (goniometer)
171.0
(Dartfish)
.68m
0.3
160
(goniometer)
163.3
(Dartfish)
.86m
0.72
Straight leg flexion
90
(goniometer)
98.7
(Dartish)
.85m
0.52
95
(goniometer)
110.8
(Dartfish)
1.04m
0.82
Explanation / Answer
form participant one
goniometer reading
tangential speed = w*r = 3.02*0.85 = 2.567 m/s
centripital aceleration = w^2*r = 3.02^2*0.85 = 7.75234 m/s/s
Dartfish reading
tangential speed = 3.31*0.85 = 2.8135 m/s
centripital acceleration = w^2*r = 9.312685 m/s/s
for participant 2
goniometer reading
tangential speed = w*r = 2.02*1.04 =2.1008 m/s
centripital aceleration = w^2*r = 2.02^2*1.04= 4.243616 m/s/s
Dartfish reading
tangential speed = 2.36*1.04 =2.4544 m/s
centripital acceleration = w^2*r = 5.792384 m/s/s
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