Athletics- throws

Question 1

Impulse

Answer 1

force x time
change in motion (momentum( of a body depends on magnitude of the net external force acting on it and time per which the force acts

Question 2

Increasing impulse

Answer 2

time which the force is applied

force over constrained time period

Question 3

air resistance

Answer 3

Trajectory and range of projectiles is affected by the force of the air
Drag: acts in direction of air flow
Lift: acts at right angle to drag
contributing factors- density of fluid, cross sectional area exposed to flow, velocity of body relative to fluid, smoothness of body , orientation of body to the flow

Question 4

Kinetic chains

Answer 4

Biomechanics principle: skilled human motion involves sequencing of segmental rotations
Kinetic chain consists of a system of segmental links contributing to a movement
could be open or close

Question 5

open kinetic chains

Answer 5

the most distal segment in the movement is free to move in space

Question 6

closed kinetic chains

Answer 6

the most massive segment in the movement is located at the end of the kinetic chain and the least massive is located at the fixed end