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WAPhysical EducationQuick questions
Unit 3: Factors Affecting Performance
Quick questions on Biomechanics of movement: WACE Year 12 Physical Education Studies Unit 3
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is newton's laws of motion?Show answer
Newton's first law (inertia) states that a body stays at rest or in uniform motion unless an unbalanced external force acts on it. A stationary ball will not move until a foot applies force; a sprinter keeps decelerating after the line because of inertia.
What is force summation?Show answer
Force summation is the principle that maximum force is produced when as many body parts as possible are used, in the correct sequence and with correct timing. For a maximal throw the large, slow body parts move first (legs and trunk), transferring momentum to smaller, faster parts last (shoulder, elbow, wrist), so each segment adds to the velocity built by the one before. The sequence is proximal to distal, and the parts must be used in order rather than all at once.
What is projectile motion?Show answer
Once airborne, a projectile such as a ball or jumper follows a parabolic path governed by the angle, speed and height of release, with gravity acting downward and (in simple models) horizontal velocity constant. The horizontal and vertical components are independent: horizontal velocity covers distance while vertical velocity governs flight time. For release at ground level the optimal angle is about 45 degrees, but for releases above landing height (a shot put released from shoulder height) the optimal angle is lower, around 38 to 42 degrees, because the extra release height buys flight time.
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