Force and Acceleration

Force and Acceleration - Announcements Help room hours...

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Announcements Help room hours (1248 BPS) Mon 5:30-8:30 PM Tues/Thurs noon-2:50 PM CAPA homework #3 due next Tuesday at 10 AM Final exam Friday Dec 12 10 AM - noon
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Clicker question Where is the acceleration negative?
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Acceleration Reminder: acceleration is the rate of change of velocity. It doesn’t mean increase in speed, or even change in speed, just change in the velocity, either direction or magnitude.
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Understanding motion Aristotle (384 BC – 322 BC) natural motions (vertical)-objects seek their natural location violent motions (horizontal) require active agents Galileo (1564-1642) used experimentation to deduce the laws of motion introduced concept of inertia spent a great deal of time trying to understand acceleration Newton (1643-1727) developed quantitative connections between forces and motion
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Isaac Newton In 1687, the world changed Isaac Newton published his Mathematical Principles of Natural Philosophy Newton was able to give quantitative descriptions of motions both in our world and in the rest of the universe In the 20 th Century, we’ve come to realize that Newtonian physics is an approximation relativity and quantum mechanics give a better description in regimes where the speeds are close to that of light, and where the distances are at the atomic level or smaller Nature and nature’s laws lay hid in night; God said , “Let Newton be” and all was light Alexander Pope, 18 th Century British poet
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Isaac Newton and Q Coincidental resemblance, I think not
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What is a force? Practical definition: it’s a push or pull It can cause a body to accelerate It’s a vector so it has both a magnitude and direction Force is the rate of change of momentum Newton’s 3 laws 1. If the net force on an object is zero, the object will not accelerate Galileo’s law of inertia 2. The amount of acceleration depends on the net force and on the mass of the object 3. For every force there is an equal and opposite force
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First law In 1543, on his deathbed, Nicholas Copernicus published his life’s work, De Revolutionibus Orbium Coelestium, in which he proposed the Earth moves around the sun Why did he wait so long? he was afraid of the reaction of the church he didn’t understand the first law He couldn’t conceive of a force big enough to keep the Earth moving not realizing that once in motion, it will stay in motion If the net force on an object is zero, the object will not accelerate
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Force and Acceleration - Announcements Help room hours...

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