PENation

Question 1

Factors affecting size of moment of inertia

Answer 1

1) Mass-The greater the mass, the greater the MI
2) Distribution of the mass from the axis of rotation-The further the mass moves from the axis of rotation, the greater the MI

Question 2

What are limb kinematics

Answer 2

Study of movement in relation to time and space

Question 3

What are Force plates

Answer 3

Ground reaction forces are measured in laboratory conditions using force plates

Question 4

What are wind tunnels

Answer 4

Steel frame buildings containing wide fans, where artificial wind is produced

Question 5

What is linear motion

Answer 5

Movement of a body or part of a body in a straight or curved line, where all parts move the same distance in the same direction at the same time

Question 6

Skeletal muscle contraction

Answer 6

1) Nerve impulse initiated in the motor neuron cell body
2) Nerve impulse conducted down the axon of the motor neuron by a nerve action potential to the synaptic cleft
3) Neurotransmitter called Acetylcholine is secreted into the synaptic cleft to conduct the nerve impulse across the gap
4) If the electrical charge is above threshold, the muscle fibre will contract
5) This happens in an (all or none law’ fashion. Either all muscle fibres will contract or none will contract

Question 7

What are the components of the fast alactacid recovery process

Answer 7

-Phosphocreatine stores restored
-Replenishment of blood and muscle oxygen

Question 8

What are the components of the slow lactacid recovery process

Answer 8

-Elevated ventilation and circulation
-Elevated body temperature
-Removal of lactic acid