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Chapter 4 Newton’s First Law of Motion M.Atanasiu. Text - Conceptual Physics (Hewitt) Based on Dr. Bruton’s lectures at Austin State University

Sir Isaac Newton (1643 – 1727) > Born shortly after Galileo died > Inventor of Calculus > Known for his laws of motion

Isaac Newton's own first edition copy of his Philosophiae Naturalis Principia Mathematica with his handwritten corrections for the second edition.

A reputed descendant of Newton's apple tree, found in the Botanic Gardens in Cambridge.

“ If I have seen further it is by standing on the shoulders of giants”

Aristotle on Motion (350 BC) ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object]

Copernicus (1500's) ,[object Object],[object Object]

Galileo (1600's) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Isaac Newton (1642-1727) ,[object Object]

Newton’s First Law ,[object Object],[object Object]

Newton’s First Law Examples ,[object Object],[object Object],[object Object],[object Object],[object Object]

Mass ,[object Object],[object Object],[object Object]

Weight ,[object Object],[object Object],[object Object],[object Object]

Mass and Weight should not be confused with... ,[object Object],[object Object],[object Object],[object Object]

Mass and Weight ,[object Object],[object Object],[object Object],[object Object]

Weight Location Mass Earth Moon Space 18.4 kg 18.4 kg 18.4 kg 180 N 30 N 0 N

[object Object],10 N NET FORCE 10 N 10 N = 20 N 10 N 10 N = 0 N 10 N 20 N = m m m m m m

THE EQUILIBRIUM RULE Examples of Mechanical Equilibrium: Hanging from a tree Weighing yourself on a set of scales Computer setting on a table Car parked on an incline Normal up Weight down Weight down Weight down Weight down Scales pushing up Tree pulling up Normal Friction

The Equilibrium Rule ,[object Object]

[object Object],[object Object],SUPPORT FORCE Scales pushing up Weight down Normal up Weight down

[object Object],[object Object],EQUILIBRIUM OF MOVING THINGS Examples: Driving at constant velocity Force from road Air Resistance Normal up Weight down Terminal velocity in parachuting Weight down Air resistance

[object Object],[object Object],[object Object],THE MOVING EARTH

Which person below is most highly recognized for proposing a heliocentric universe? ,[object Object],[object Object],[object Object],[object Object]

If an object weighs 10 N, what must the air resistance force be if the object is falling and has reached terminal velocity? (a) 10 N (b) 32 N (c) there is no way of telling without knowing what the value of the terminal velocity is

Newton's concept of motion said that the natural state of an object was ,[object Object],[object Object],[object Object]

Classwork Questions ,[object Object],[object Object]

Homework Questions ,[object Object],[object Object]

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