Lecture 8 - Lecture 8 pls-8.1 Newtons 3 Laws of Motion...

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Lecture 8 pls-8.1 Newton’s 3 Laws of Motion Media: 1. Tennis Ball 2. 2 carts (1 heavy, 1 light) on track w/ fan 3. Evil Knievel ant movie. 1. Introduction These three laws apply to the motion of all macroscopic (> ~ 0.1 μm) objects at relatively slow speeds (<< speed of light). 2. Newton’s First Law Clicker questions 1-3 . Summary: being motionless or moving at constant velocity is boring. 1 st Law: An object’s position will remain motionless or move at constant velocity when no external forces act upon the object. N’s 1st law says that unless acted upon by external forces, the motion of an object is boring. Mass Motion Forces #1 #3 #2
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Lecture 8 pls-8.2 1 st law is not obvious: i. Inanimate objects: seem to want to come to rest. (cart, tennis ball) . ii. Animate objects: seem to move around “on their own accord.” (person walking around) . But, if one is careful to remove all external forces on the object, then one finds that the object moves at constant velocity . This property of constant motion
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Lecture 8 - Lecture 8 pls-8.1 Newtons 3 Laws of Motion...

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