Lecture 4 Biomechanical Principles: Newton's 2nd Law

Question 1

What is Newton’s Second Law of Motion?

Answer 1

Law of Acceleration

Question 2

Newton’s second law for linear acceleration states that…

Answer 2

the linear acceleration of a body is directly proportional to the force causing it, takes place in the same direction in which force acts and is inversely proportional to the mass of the body
-F=ma

Question 3

Newton’s second law for angular acceleration states that…

Answer 3

the angular acceleration of a body is directly proportional to the torque causing it, take places in the same rotary direction in which the torque acts and is inversely proportional to the mass moment of inertia of the body
-T=mmi (I) x angular acceleration (a)

Question 4

Angular acceleration is __________ proportional to the mass moment of inertia

Answer 4

inversely

-inc mmi = dec angular acceleration

Question 5

We can manipulate the mass moment of inertia by moving a weighted cuff from the wrist to the midforearm which results in a ______ mmi, thus ______ in angular acceleration

Answer 5

• smaller

- increase