angular motion

Question 1

what is angular motion

Answer 1

it refers to rotation and involves turning around an axis

angular motion can be a whole body or a part of a body like arms or legs

Question 2

examples of angular motion for a part of a body

Answer 2

throwing a discuss, arms and legs whist running, forehand in tennis

Question 3

how do we create a turning force

Answer 3

we apply the force eccentrically

eccentric forces create more torque

Question 4

angular motion occurs as a result of…

Answer 4

torque

Question 5

what is torque

Answer 5

it is a turning force that causes an object to rotate around its axis

Question 6

if you increase the size of the force it increases torque what happens to angular motion

Answer 6

it is increased

Question 7

how can torque be changed to have different effects on angular motion

Answer 7

if it is applied closer to or further away from the axis of movement

Question 8

what affect does perpendicular distance from fulcrum (pivotal point) have on torque

Answer 8

the greater the distance the the more we multiply by and so the greater the torque

Question 9

what is newtons first law in relation to AM

Answer 9

a rotating body will continue to turn about its axis of rotation with constant angular momentum unless an external rotational force (torque) is exerted upon it

Question 10

what is newtons first law in relation to AM applied to a figure skater

Answer 10

spinning in flight they will continue to spin until they land and an external force is applied onto their skates this will change and slow their angular momentum, this force will be friction

Question 11

what is newtons 2nd law in relation to AM

Answer 11

the rate of change of angular momentum of a body is proportional to the force (torque) causing it and the change takes place in the direction in which the force (torque) acts

the greater torque (turning force) exerted the faster the rotation

Question 12

what does the moment of force =

(2nd)

Answer 12

moment of force (torque-newton meters)= force (newtons) X perpendicular distance from fulcrum (pivotal point) (m)

Question 13

apply newtons 2nd law in relation to AM for lacrosse sticks

Answer 13

with a longer stick (defense) there is a longer perpendicular distance from the fulcrum so you can propel the ball with the most force

shortest stick (attack/midfield) there is a shorter perpendicular distance from the fulcrum so it allows more control

Question 14

what is newtons 3rd law in relation to AM

Answer 14

when a force (torque) is applied by one body to another the second body will exert an equal and opposite force (torque)

Question 15

apply newtons 3rd law in relation to AM for a tennis lpayer

Answer 15

a tennis player applies a downwards slice action on the ball it will rotate (spin) to replicate the amount of torque provided