11.2 angular motion

Question 1

angular motion

Answer 1

movement around a fixed point

Question 2

torque

Answer 2

force that causes rotation
force x distance from fulcrum

Question 3

newtons first law

Answer 3

rotating body will continue to turn about its axis unless an external force (torque) is exerted upon it

Question 4

newtons second law

Answer 4

rate of change of angular momentum of a body is proportional to the torque causing it

greater the torque, faster the rotation

Question 5

newtons third law

Answer 5

when torque is applied, equal and opposite torque is exerted from other body

Question 6

angular displacement

Answer 6

smallest change in angle between start and finish point of rotation

Question 7

angular velocity

Answer 7

rotational speed of an object
angular displacement (rad) / time

rad/s

Question 8

angular acceleration

Answer 8

rate of change of angular velocity
change in angular velocity/ time

rad/s2

Question 9

moment of inertia

Answer 9

resistance of a body to angular motion

greater the mass, greater moment of inertia

closer to axis, smaller inertia
e.g. tucker summersault is quicker

Question 10

angular momentum

Answer 10

quantity of rotation a body possesses

moment of inertia x angular velocity

stays constant unless external torque is exerted