Kinesiology 3341A/B Lecture Notes - Lecture 5: Air Hockey, Net Force, Ground Reaction Force
13 Dec 2019
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Range= (horizontal velocity x ight time) or velocity x time. *if a ball starts higher up (vs. a lower released ball), it will have a higher velocity, and ultimately go farther . However, both balls will spend the same time in the air (because both balls are accelerating downwards at 9. 81 m/s) *when a ball is thrown from a cliff, the vertical velocity increases but the vertical acceleration is constant (9. 81m/s) Newton"s second law: the acceleration of an object is proportional to the net force acting on it and inversely proportional to the mass of the object f= ma (mass is in kg) Force is a vector so it has a direction (ie. if 2 people are pulling in different directions at 200 n, the net force is 0) Newton"s third law: for every action, there is an equal and opposite reaction. Body weight in the oor is the action ( i am here )
