Lecture 7

# Lecture 7 - Lecture 7 pls-7.1 2D Motion Media 1 Tennis ball...

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Lecture 7 pls-7.1 2D Motion Media: 1. Tennis ball 2. Shoot the monkey demo 3. Cart with firing ball 1. 2D Motion Two dimensional (2D) motion is motion where an object moves in a plane. Examples: The arc of a thrown tennis ball lies in a plane (if the effects of air are negligible). Another example includes the motion of pool balls on a pool table (until they fall in a pocket!). For 2D motion all three kinematics vectors – position, velocity, and acceleration – lie in the same plane, as illustrated in the drawing below. It takes two axes ( x and y ) to describe such motion. Vector components of () t r r along a set of x - y axes are also indicated in the drawing. ( ) t r r + x + y ( ) t v r ( ) t a r ( ) t x r r or ( ) t x r () t y r r or () t y r

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Lecture 7 pls-7.2 2. 2D Motion with Constant Acceleration If acceleration is constant, then the acceleration vector is constant (constant magnitude and direction ) during the motion of the object. Its
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Lecture 7 - Lecture 7 pls-7.1 2D Motion Media 1 Tennis ball...

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