newton's first law of motion with audio

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Newton’s First Law of Motion:

Newton’s First Law of Motion The Law of Inertia Ch. 2

Aristotle vs Galileo:

Aristotle Natural vs Unnatural motion No experiments Galileo Experiment on top of Leaning Tower of Pisa All objects fall at same rate (if we ignore air resistance) Inertia Tendency of things is to remain as they are Property of matter to resist changes in motion Aristotle vs Galileo

Speed vs Velocity:

Speed Distance travelled divided by time Instantaneous vs average Instantaneous—speed at that instant Average—average speed On a trip to Vail, CO, we travelled 750 miles in 12 hours. What was our average speed? Speed vs Velocity

Slide 4:

Velocity Speed and direction Vector quantity (must know direction) What are the 3 ways to change velocity? Copyright © Houghton Mifflin Company. All rights reserved.

Newton’s First Law of Motion:

Law of Inertia Every object continues in its state of rest or of uniform speed in a straight line unless a net force acts on it Things tend to do what they are already doing Newton’s First Law of Motion

Net Force:

Net force causes change in state of motion Units: pounds or newton (N) Net Force

Objects at rest:

If net force is 0, object remains at rest ΣF=0 (sum of vector forces = 0) Mechanical equilibrium Bag of sugar on tension scale Downward force of gravity Upward tension (stretching force) Objects at rest

Support Force:

Object on horizontal surface Gravity (weight) pulls object down Support Force Upward force that balances weight of object on surface Must be equal to weight of object Normal force (perpendicular to surface) Support Force

Objects in motion:

Object moving at constant velocity Space shuttle Static equilibrium—objects at rest Dynamic equilibrium—object moving at constant velocity Objects in motion

Objects Move with the Moving Earth:

Earth moves around the Sun, but so does everything on the surface of the Earth Objects in motion remain in motion unless acted upon by a force—Law of Inertia Examples: flip a coin in airplane, bird catching worm Objects Move with the Moving Earth