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Why go into physics?

Discover the fascinating world of physics and how it influences our daily lives! This guide delves into the key concepts of motion, speed, and graphs, helping you grasp the principles behind these phenomena. Learn how to calculate speed and understand the difference between average and instantaneous speed. Explore real-world applications through engaging examples such as sports and wildlife. With practical exercises and questions to enhance your learning, this is your chance to uncover the exciting interactions between physics and the world around you.

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Why go into physics?

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  1. Why go into physics? • Go to www.physics.org • Find 3 areas that interest you • List 2 jobs that you could have in that area • Google 1 of the jobs and try and find out how much that job makes

  2. Physics effects every moment of your life! • ____________________ • ____________________ • ____________________ • ____________________ • ____________________

  3. CH. 2 Motion Keep on truckin

  4. What is motion? • Motion is a change of position of an object. • A reference point must be specified in order to determine an object's position

  5. What is Speed? • Rate—any change over time • Speed—the distance an object travels per unit of time. fastest

  6. The Comic Book of Science Graphs! Speed= distance time graphs • The slope of a line (steepness) on a distance-time graph is equal to the speed. • Shallow slope is slower than steep slope

  7. Draw this on your paper! Y-axis faster slower Distance (meters) Standing still X-axis Time (seconds)

  8. Distance Time Graphs • What information is recorded on the x-axis? • How many minutes does each line represent? • In what units is distance measured on the graph? • The graphs represent three swimmers, What does the slope of the lines tell you about the swimmers?

  9. Which swimmer swam the fastest? • Which swimmer stopped for 10 minutes? • How far did the blue swimmer travel in 15 minutes? • What is the difference in distance traveled between the red and green swimmer?

  10. Warm-up 1/31/11 • Review questions: What is one thing that is good for the brain to learn? • Teach the teacher questions: What is your favorite dessert? Do you have a cell phone? Does your cell phone have a camera?

  11. What are the fastest animals (mph)? • Cheetah 70 • Pronghorn antelope 61 • Lion 50 • Thomson's gazelle 50 • Wildebeest 50 • Springbok 50 • Quarter horse 47.5 Cape hunting dog 45 • Elk 45 • Coyote 43

  12. The real world graphing… • The Band is on the Field!

  13. D S T divide multiply Calculating Speed • The speed of an object can be calculated from this equation: • Speed = Distance Time • S=D/T • When working equations • Write the formula • Plug in the values for each known • Calculate the answer • Write the answer and a unit

  14. Average & Instantaneous Speed • Average speed—the total distance traveled divided by the total time of travel. • Instantaneous speed—the speed at a given point in time.

  15. Physics To Win It Tada

  16. Velocity • Speed describes only how fast something is moving. • Velocity—includes the speed of an object AND the direction of its motion

  17. Example: • Example: a race car has a constant speed of 100km/hr around an oval track. • The speed remains constant, but the velocity changes.

  18. Acceleration • Acceleration—the rate of change of velocity. • The change in velocity over time • acceleration = change in velocity time • When something speeds up, it has a positive acceleration • When something slows down, it has a negative acceleration.

  19. Application of speed, velocity, and acceleration • Sports Science

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