chapter 15

Question 1

torque

Answer 1

-dependent on magnitude of force and moment arm length

Question 2

moment of inertia

Answer 2

• I=mr^2
• mass distribution is dom factor
• resistance to a change in rotary motion

Question 3

radius of gyration

Answer 3

• angular center of mass

- point mass representation of object

Question 4

angular momentum conservation

Answer 4

• can redistribute mass further or closer to axis
• r decrease = w increase
• r increase = w decrease

Question 5

apply angular momentum to controlled rotation in air

Answer 5

• fixed angular rotation when athlete leaves platform

- decrease I = increase w during rotations

Question 6

apply angular momentum to vertical jump then strike

Answer 6

• zero momentum at vertical jump
• momentum generated when arm rotates
• lower body rotates in opp direction to maintain zero

Question 7

apply angular momentum to transfer of angular momentum

Answer 7

• limb devels angular momentum when prox segment rotates and distal segment rotates
• stop prox segment = I decrease
• I decrease = w increase