Exam 3 Flashcards
(10 cards)
What is the definition of Kinetics?.
The rate of change of displacement with respect to time.
The branch of mechanics that is concerned with the effects of forces on the motion of a body or system of bodies, especially of forces that do not originate within the system itself.
The distance between the initial and final point of an object. It is a vector quantity having both magnitude and direction.
The branch of mechanics that studies the motion of a body or a system of bodies without consideration given to its mass or the forces acting on it.
The branch of mechanics that is concerned with the effects of forces on the motion of a body or system of bodies, especially of forces that do not originate within the system itself.
Movements in the sagittal plane occur around which axis?
Mediolateral axis
Knee extension takes place in what plane?
Sagittal
If a video trial is 8.2 seconds long, and the frame rate is 25 frames per second, how many frames does the video consist of?
205fps
What should you ensure when filming movement?
A. The camera focus is set when zoomed in
B. The participant should not wear a t-shirt
C. The markers should be placed over the muscle
D. A and C
A. The camera focus is set when zoomed in
In symbols, pressure is equal to
A. A/F, where A is area and F is force
B. F/A, where F is force and A is area
C. d/F, where d is distance and F is force
D. F/d, where F is force and d is distance
B. F/A, where F is force and A is area
Which of the following is a key position within the walking gait cycle? A. Double limb support B. Initial contact C. Stance D. A and B
D. A and B
Where should EMG electrodes be positioned in surface EMG?
Over the belly of the muscle
What is the most commonly used method of collecting EMG in sport?
Surface electrode
Which of the following is incorrect: Muscle forces in the human body vary due to
A. The number of active motor units (MU),
B. Their cross sectional area
C. The strength of the person
D. Their firing rate
C. The strength of the person
