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Speed, Velocity, Acceleration

Speed, Velocity, Acceleration. Physics Date: _______. Objectives. explain the idea that motion is relative define speed and distinguish between instantaneous and average speed distinguish between speed and velocity, and describe how to tell whether a velocity is changing.

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Speed, Velocity, Acceleration

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  1. Speed, Velocity, Acceleration Physics Date: _______

  2. Objectives • explain the idea that motion is relative • define speed and distinguish between instantaneous and average speed • distinguish between speed and velocity, and describe how to tell whether a velocity is changing. • solve mathematically for speed/velocity and acceleration • define acceleration and give examples of units.

  3. Relative Questions According to the book, what does relative means? In physics, we will talk about motion relative to what? Facts Something is considered in the context of something else Walking= I move relative to the earth. Sitting= I move relative to the solar system (Earth is moving) Motion relative to the Earth

  4. Speed Questions What is speed? What is one equation for speed? What are the units? Is speed a scalar or vector quantity? Facts - A measure of how fast something is moving - The rate that distance is covered s = d/t m/s, km/h Scalar (no direction)

  5. Different Types of Speed Questions What is instantaneous speed? Give an example too! What is average speed? Give an example too! Facts speed at any instant i.e. speedometer reading the total distance covered over a time interval - General speed from point A to B

  6. Velocity Questions What is velocity? What is one equation for velocity? What are the units? Is velocity a scalar or vector quantity? Facts speed in a given direction i.e. 5 m/s north v=d/t m/s km/h Vector quantity

  7. Velocity and Speed Question How are speed and velocity alike? How are speed and velocity different? Facts The magnitude is the same (how fast) Same units Velocity includes a direction (vector), speed does not

  8. More about Velocity Questions How can one keep velocity constant? How can one change velocity? Facts Do not speed up/ slow down Do not change direction Speed up Slow down Change direction Change speed and direction

  9. Acceleration Questions What is acceleration? What is one equation for acceleration? What are the units? Is acceleration a scalar or vector quantity? Facts the rate at which velocity is changing a= v/t m/s2, km/h2, m/s/s, km/hs Vector quantity

  10. Velocity and Acceleration Topic What happens if velocity changes? How can one accelerate? Facts Acceleration results Same as velocity; Speed up Slow down Change direction Change speed and direction

  11. Check for understanding When you look at the speedometer in a moving car, you can see the car's

  12. Check for Understanding Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is NOT true?

  13. Check for Understanding What is the average acceleration of a car that goes from rest to 16 m/s in 8 seconds? Solve a = v/t = (16m/s) (8s) = 2 m/s/s = 2 m/s2 Unknown a Known v = 16 m/s t = 8 s Equation a = v/t

  14. Check for Understanding A bicycle travels 15 km in 0.5 h. What is its average speed? Solve v = d/t = (15 m) (0.5 h) = 30 m/h Unknown v Known d = 15 m t = 0.5 h Equation v = d/t

  15. Closing

  16. Homework Complete handout with practice problems

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