Kinesiology 3341A/B Lecture Notes - Lecture 4: Tennis Ball
13 Dec 2019
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Optimal angle of trajectory= may not be 45 degrees this is because of air resistance. The velocity of the ball was changing when the ball was thrown. Vertical velocity was changing and accelerating the entire time. Air resistance is always a function of the velocity vector it depends on the direction the ball was travelling. The tennis ball has a small cross sectional area and its travelling through air (which is not dense) allowing air resistance to be small. Whether you drop the ball to the ground or serve the ball to the ground, the balls will land at the same time because gravity is acting on the ball at 9. 81 m/s2. *if the velocity is changing, the intervals of displacement will change. Horizontal distance just depends on how hard you hit the ball. The farther the ball goes/harder it is hit, the longer the ball will be in the air.
