Chapter 8 Quiz Flashcards
Match the linear term, impulse (Ft), to its angular analogue.
Question options:
1) Iω
2) Iα
3) Moment of inertia
4) Torque
Iω
Why does gravity not affect angular momentum?
Question options:
1) Gravity does affect angular momentum.
2) Both d⊥ = 0 and T = 0
3) d⊥ = 0
4) T = 0
Both d⊥ = 0 and T = 0
The statement “a rotating body will maintain a state of constant angular motion unless acted on by an external torque” refers to which of the following?
Question options:
1) Newton’s first law of inertia
2) Newton’s second law of acceleration
3) Newton’s third law of action/reaction
4) None of the above
Newton’s first law of inertia
Somersaulting occurs around which of the following axes of rotation?
Question options:
1) Frontal
2) Longitudinal
3) Sagittal
4) All of the above
Frontal
Why does a figure skater cross his arms tightly across the chest when performing a quadruple axel?
Question options:
1) To reduce moment of inertia
2) To increase angular velocity
3) To increase time in the air
4) Both A and B
5) All of the above
Both A and B
When a cyclist rounds a curve, where does centripetal force act?
Question options:
1) On the cyclist’s centre of gravity
2) On the tires of the cycle
3) On the ground
4) On the cycle’s centre of gravity
On the tires of the cycle
Moment of inertia is the angular analogue of which of the following?
Question options:
1) Moment of force
2) Moment of time
3) Mass
4) Surface area
Mass
Match the linear term, momentum (M = mv), to its angular analogue.
Question options:
1) Moment of inertia
2) Torque
3) Iω
4) Iα
Iω
Rotating around which of the following principal axes of rotation has the least moment of inertia (anatomical position)?
Question options:
1) Anteroposterior (sagittal)
2) Longitudinal
3) Transverse (frontal)
4) Need more information
Longitudinal
Regarding moment of inertia of the leg with respect to the hip, which of the following leg morphologies would favor a sprinter?
Question options:
1) Massive thighs and slimmer lower legs
2) Massive lower legs and slimmer thighs
3) Need more information
4) Leg morphology does not matter
Massive thighs and slimmer lower legs
Which of the following is/are accurate formula(s) for angular momentum?
Question options:
1) H = Iω
2) H = mk2ω
3) M = mv
4) Both H = Iω and H = mk2ω
Both H = Iω and H = mk2ω
What are the appropriate units for angular momentum?
Question options:
1) kg·m/s2
2) kg·m2/s
3) kg2·m/s
4) kg·m2
kg·m2/s
Why do sprint coaches stress “heel to buttocks” during sprinting?
Question options:
1) Reduces moment of inertia of the foot with respect to the ankle
2) There is no scientific basis for this coaching cue.
3) Reduces moment of inertia of the lower leg with respect to the knee
4) Reduces moment of inertia of the leg with respect to the hip
Reduces moment of inertia of the leg with respect to the hip
What will happen to angular velocity when a diver goes from a tuck position to a full layout position?
Question options:
1) Remain the same
2) Decrease
3) Need more information
4) Increase
Decrease
What will happen to angular momentum when a diver goes from a tuck position to a full layout position?
Question options:
1) Decrease
2) Increase
3) Remain the same
4) Need more information
Remain the same