Physics!. What is Physics? Physics = The science of matter and energy and their interactions.

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Presentation transcript:

Physics!

What is Physics? Physics = The science of matter and energy and their interactions

Why Care About Physics? – 1) It's fun and interesting to understand how the universe works (Physics explains how things work. It tells you the "why" things do what they do.) – 2) Once you understand how the universe works, you might be able to use that knowledge to your advantage. – 3) Physics is a part of everything that happens on the planet and to you!

Famous Physicists Galileo Galilei ( ) Italian who did experiments and mathematical analyses in astronomy and physics; discovered mountains and craters on the moon, the phases of Venus, and the four largest satellites of Jupiter Galileo Galilei Sir Isaac Newton ( )Englishman who developed theories of gravitation and mechanics, and invented differential calculus Sir Isaac Newton Benjamin Franklin ( )American the first American physicist; characterized two kinds of electric charge Benjamin Franklin Albert Einstein ( )German-born American; contributed to theory of atomic spectra; formulated theories of special and general relativity Albert Einstein

Energy! Kinetic POTENTIAL Energy of an object in motion Ex. Roller coaster moving downhill Energy a resting object can store due to its position Ex. Roller coaster at the top of a hill

Chapter 12 Motion & Momentum

Motion What is motion? In physics, motion is a change in position of an object with respect to time.

Displacement Distance from start to finish

Speed Speed = the distance traveled divided by the time » s = d/t * Don’t forget to label units – Ex. Miles/minute or Km/hr.

Types of Speed AverageInstantaneous Overall Rate of Speed Speed of an object at one instant of time Both are still calculated as (s = d / t)

Calculating Speed Ex. A snail moved 1 meter in 10 minutes. What is the snail’s average speed? Ex. A boat travels 100 miles. If it was traveling at an average speed of 25 mi/hr, how long did it take the boat to reach its destination?

Velocity Velocity = Speed + Direction of Motion – Ex. 40 km/h north

Calculating Velocity Ex. A car moved 20 km East and 60 km West in 2 hours. What is its average velocity? Velocity = Displacement + Direction time

Graphing Motion A Distance-time Graph is used to compare speeds of objects X-axis = time Y-axis = distance

What might be happening at each point?