Physics Recap

Average speed: the speed over an OVERALL journey.

Does NOT mean normal or common. Involves math.

Instantaneous speed: the speed of the moment.

Does NOT mean fast speed.

Average Speed and Instantaneous speed are BOTH calculated using the SAME equation - speed = distance/time. They BOTH have to do with the time it takes someone to travel a certain distance.

Tortoise and the Hare

Newton's First - unbalanced forces cause acceleration.

An object at rest DOES have forces acting on it.

Newton's 2nd - Describes the relationship between force, acceleration, and mass. It is represented by the equation F=MA

Newton's 3rd - When two objects interact along a line, the reaction is equal and opposite. For these paired objects, every action has an equal and opposite reaction.

Inertia - the TENDENCY for an object to resist acceleration. A quantitative measurement of inertia is MASS - recorded in numbers and given the unit grams or kilograms.

An object's mass is NOT dependent on the speed of the object - as such, an object's inertia is not dependent on speed or acceleration, since these are the same ideas.

Acceleration - any change in speed AND/OR direction.

A car traveling 50 mph along a straight highway is not accelerating - why?

A car traveling a long a curved race track is accelerating - why?

Friction - a FORCE that opposes motion between two objects when they touch.

Gravitational force are attractive and depend on the masses of the objects and the distances between them.


Created with images by Unsplash - "aurora borealis northern" • Pexels - "aircraft airplane aurora borealis" • torbakhopper - "to be alone, as one god" • European Southern Observatory - "Milky Way Shines over Snowy La Silla" • 27707 - "aurora aurora borealis borealis" • Tabor - "landungsbrücken port of hamburg northern germany" • skeeze - "aurora borealis northern lights sky" • ikewinski - "Aurora Trails with Meteor" • Image Editor - "Northern Lights" • NASA Goddard Photo and Video - "NASA's MESSENGER Satellite Captures Spectacular Color Mosaic of Mercury" • Moyan_Brenn - "Iceland" • Wolfgang Staudt - "clouds"

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