Angular Kinetics

Question 1

centric force

Answer 1

-force where line of action passes through an object’s COG (if there is no fixed axis) or through a fixed axis of rotation
-effect:
1. no linear acceleration
2. no angular motion

Question 2

eccentric force

Answer 2

-force where line of action passes off-center to an objects COG or its fixed axis of rotation
-effect: linear acceleration, angular acceleration

Question 3

biomechanical application

Answer 3

-muscle force alone, contract quads for knee ext
-effect: linear angular motion, glide and knee ext

Question 4

torque movement

Answer 4

T=Fxperpdistacne

Question 5

-moment arm (dperp)

Answer 5

• the perpendicular distance from the line of action of the force to the axis of rotation

Question 6

turning effect

Answer 6

produced by eccentric force

Question 7

factors influencing the magnitude of torque

Answer 7

1. magnitude of the eccentric force
2. distance from the axis of rotation that the force is applied
   , moment arm of force

Question 8

force couple

Answer 8

-pair of eccentric forces which are equal in magnitude, parallel and opposite in direction
-effect: angular acceleration

Question 9

moment of inertia

Answer 9

-resistace to change in state of angular motion
-Mass X radius of rotation
-distribution of the mass about the fixed axis

Question 10

angular momentum

Answer 10

-MI X angular velocity- massXradius of rotation

Question 11

conservation of angular momentum

Answer 11

-angular momentum remains constant unless acted upon by an external force
-distribution of mass

Question 12

transfer of angular momentum

Answer 12

-segments have to be divided
-1 segment slows and transfers momentum to the next segment