Angular Kinematics

One radian equals how many degrees?

57.3

What is angular motion?

All parts of an object do not move the same distance

during elbow flexion, the movement produces an angular velocity of 2 radians per second. If the movement tool 1 second to complete, what was the change in position in degrees? a)114.6 degrees b)45 degrees c)28.65 degrees d)180 degrees

a

a fulcrum is what?

a center of rotation

angle

a measure of the orientation of two line, two planes, or a line and a plane that intersect.

what is a relative angle?

angle at a joint formed between the longitudinal axes of adjacent body segments (joint angle)

the change in absolute angular position is?

angular displacement

what is an absolute angle

angular orientation of a body segment with respect to a fixed line of reference

a guy has a shoulder injury. The doctor is checking his range of motion by horizontally abducting his left arm. If his current arm position is 55 degrees, and his final position is 113 degrees, what is the angular displacement of his arm? a)+168 degrees b)58+degrees c)+125degrees d)+35degrees e)+68degrees

b

during a 1=RM bicep curl, the angle between the upper arm and lower arm changes from 8degreees(fully extended) to 162degrees (fully flexed). If it takes 3 seconds to complete the lift, what is the angular velocity? a)57degrees/sec b)51degrees/sec c)6degrees/sec d)172degrees/sec e)18degrees/sec

b

a participant in your study is pedaling on a cycle ergometer and the flywheel is rotating at 60 revolutions per minute (RPM). He then accelerates to 90 RPM over the course of 20seconds. what is his average angular acceleration? a)30degrees sec-2 b)2 degrees sec-2 c)9 degrees sec-2 d)5 degrees sec -2

c

during a sprinting, a knee angle of 85 degrees from vertical is an example of which type of angle? a)relative angle b)complimentary angle c)obtuse angle d)absolute

d

what is the angular displacement? the initial angle is 25 degrees from vertical and the final angle is 165 degrees from vertical. a)190 degrees b)140 degrees c)-190 degrees d)140 degrees

d

two types of angles

relative and absolute

how do you measure an absolute angle

the trunk with respect to vertical is often a quantity of interest in studies of lifting as related to low back pain