Class Notes (1,100,000)

CA (650,000)

Western (60,000)

Kinesiology (4,000)

2241A/B (500)

Dr Jim Dickey (7)

Lecture 4

School

Western UniversityDepartment

KinesiologyCourse Code

Kinesiology 2241A/BProfessor

Dr Jim DickeyLecture

4This

**preview**shows half of the first page. to view the full**2 pages of the document.**Assignment 4: Biomechanics

Christian Megan Turres

250911289

1. If a collision occurred with someone who weighed twice as much as your relative magnitude

would decelerate twice as much. The magnitude of acceleration is affected by mass, because

the person colliding into you weighs twice as much, you would both experience an opposing

force but their force would have a greater impact. Thus, making you decelerate twice as much

than the person that weighs more.

2. The mass of your arm is what makes up the arm and its inertia. Inertia as Newton’s first

law dictates is that objects don’t like to be accelerated due to inertia they possess. The

mass of your arm is related to inertia as is acts to prevent linear acceleration. Mass

moment of inertia differs from mass of your arm as it shows resistance against being

angularly accelerated. Angularly accelerated is also known as rotational inertia.

Rotational Inertia can be determined by first calculating the Inertia which is mass times

how far away the mass is from the center of axis/ radius squared. The farther the mass

from the center of rotation the bigger the rotation, the closer the mass the faster the

angular velocity. An example of this would be when a ballerina spins on her toe. First

the ballerina starts with her arms out to create a Rotational inertia and then pulls them

in to spin quicker which increases the angular velocity.

3.

a) If the radius gyration changed to 1/3 k the angular velocity would increase by 9 times

b) If the radius gyration change to 1/5 k the angular velocity would increase by 25 times

c) If the radius gyration change to 6k the angular velocity would decrease to 1/36 of the

initial size

d) If the radius gyration change to 12k the angular velocity would decrease to 1/144 of the

initial size.

4.

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