Stuff I forget

Question 1

why is a gymnast in a bridge more stable than when in a handstand

Answer 1

1. more points of contact with floor
2. lower centre of mass
3. larger area of support

Question 2

describe angular motion

Answer 2

movement around a fixed point generated by an eccentric movement

Question 3

give an example of angular motion

Answer 3

a gymnast swings around the bar

Question 4

describe the structure of a motor unit

Answer 4

consists of a motor neurone and number of muscle fibres

Question 5

what is the all or none law

Answer 5

all the muscle fibres within a motor unit will contract completely or none will

Question 6

what is the effect of stimulating more motor units

Answer 6

increased force of contraction

Question 7

what is the agonist when the ankle is in plantar flexion

Answer 7

soleus/gastrocnemius

Question 8

what is the antagonist during plantar flexion of the ankle

Answer 8

tibialis anterior

Question 9

give 3 ways in which a warm up would affect the speed and strength of muscle contractions

Answer 9

increased muscle temperature
increased elasticity of joint and tissues
greater force of muscle contraction

Question 10

why would a performer want to increase friction

Answer 10

• maximise friction to accelerate
• maximise friction to slow down
• increase friction to change direction
• increase friction to impart spin on an object