11.2 Angular Motion

Question 1

define angular motion

Answer 1

movement around a fixed point/axis

Question 2

why does angular motion occur?

Answer 2

in result of a torque

Question 3

define torque

Answer 3

the rotational consequence of a force

Question 4

equation for moment of force or torque

Answer 4

moment of force or torque (newton metres)= force (newtons) x perpendicular distance from the fulcrum (metres)

Question 5

newton’s first law

Answer 5

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 6

newton’s second law

Answer 6

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

Question 7

newton’s third law

Answer 7

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

Question 8

define radian

Answer 8

the unit of measurement for angles

Question 9

define angular displacement

Answer 9

the smallest change in angle between the start and finish point of a rotation

Question 10

define angular velocity

Answer 10

the rate of change of angular displacement

Question 11

equation for angular velocity

Answer 11

angular velocity (rad/s)= angular displacement (rad)/ time taken

Question 12

equation for angular acceleration

Answer 12

the rate of change of angular velocity

Question 13

equation for angular acceleration

Answer 13

angular acceleration (rad/s2)= change in angular velocity (rad/s)/ time taken (s)

Question 14

define moment of inertia

Answer 14

resistance of a body to angular motion

Question 15

define angular momentum

Answer 15

the quantity of rotation a body possesses, it stays constant until external torque acts upon it