Quiz 9 - Angular Kinematics exam questions and answers

An ankle joint with an angular velocity of −2.4 rad/s is plantarflexing. - answer-True - positive = dorsiflexion, negative = plantarflexion Choking up on a golf club increases the tangential and angular velocities of the club head. - answer-false - same angular velocities, varies the length varying the tangential velocity During running, hip flexion, knee extension, and ankle dorsiflexion occur during initial ground contact. - answer-false - walking and running, its either hip extension, knee extension and ankle plantar flexion or hip flexion, knee flexion with dorsiflexion When bowling, angular velocity of the arm about the shoulder is zero if it is swinging at a constant angular velocity. - answer-True - if swinging is at consistent velocity then should joint is not changing its angle and hence angular velocity of shoulder is zero Points 1 and 40 cm from the center of a merry- go-round have the same angular and tangential velocities. - answer-False - tangential changes with radius and angular stays the same Centripetal accel