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Measuring Motion

Measuring Motion. Observing Motion. Must observe object in relation to another object that appears to stay in place. (reference point) Change position over time when compared with a reference point. (motion) Need to describe direction. Speed. Speed = rate at which object moves.

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Measuring Motion

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  1. Measuring Motion

  2. Observing Motion • Must observe object in relation to another object that appears to stay in place. (reference point) • Change position over time when compared with a reference point. (motion) • Need to describe direction.

  3. Speed • Speed = rate at which object moves. • Speed depends on distance traveled and the time taken to travel that distance. • The SI unit for speed is meters per second (m/s).

  4. Determining Average Speed Average Speed = total distance total time

  5. Math Break • If you walk for 1.5 hrs. and travel 7.5 km, what is your average speed? • If the average speed of a car is 110 km/h, how long will it take the car to travel 715 km?

  6. Velocity: Direction Matters Here’s a riddle for you: Two birds leave the same tree at the same time. They both fly at 10 km/h for 1 hour, 15 km/h for 30 minutes, and 5 km/h for 1 hour. Why don’t they end up at the same destination?

  7. Velocity cont. • Riddle answer: Different directions, which means that they have different velocities. • The speed of an object in a particular direction is the object’s velocity. • You MUST include direction when writing or talking about velocity. • Example: airplane’s velocity Correct – 600 km/h south Incorrect – 600 km/h

  8. Velocity Exercise Which of the following are examples of velocity? • 25 m/s forward b. 1,500 km/h c. 55 m/h south d. All of the above

  9. Velocity Cont. • Constant Velocity = no change in its speed or direction (always along a straight line) Examples: • If you’re riding in a bus traveling east at 15 m/s, you and all the other passengers are also traveling at a velocity of 15 m/s east. But suppose you stand up and walk down the bus’s aisle while it is moving. Are you still moving at the same velocity as the bus?

  10. Velocity Cont. • NO! Below shows how you can combine velocities to determine the resultant velocity. • 15 m/s east + 1 m/s east = 16 m/s east • 15 m/s east – 1 m/s west = 14 m/s east

  11. Assignment Write a paragraph (to hand in) that gives examples of when it is sufficient to know only the speed of something and when it is important to know the velocity. **** Must be at least 6 sentences long!

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