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Engagement

Engagement. Read section 2.1 on page 10 in the textbook According to the book, what does relative means ? In physics, we will talk about motion relative to what?. Relative. Questions According to the book, what does relative means? In physics, we will talk about motion relative to what?.

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Engagement

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  1. Engagement Read section 2.1 on page 10 in the textbook According to the book, what does relative means? In physics, we will talk about motion relative to what?

  2. 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

  3. Speed and Velocity Physics Date: _______

  4. 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 using the correct units

  5. Speed Questions What is speed? Is speed a scalar or vector quantity? Facts - A measure of how fast something is moving - The rate that distance is covered Scalar (no direction)

  6. Speed Questions What is one equation for speed? What are the units? Facts speed = distance/time s = d/t m/s, km/h

  7. 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

  8. Velocity Questions What is velocity? Is velocity a scalar or vector quantity? Facts speed in a given direction i.e. 5 m/s north Vector quantity

  9. Velocity Questions What is one equation for velocity? What are the units? Facts velocity=displacement/time v = ∆d/ ∆ t (∆ means change) m/s km/h

  10. 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

  11. 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

  12. Application • According to the image, how fast is the car going? • How are the velocity below different from above?

  13. Application • Is the velocity constant or changing? • Is the velocity constant or changing?

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

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

  16. Class work The Physics 500 Complete the lab activity to explore velocity. Lab safety?

  17. Closing What is velocity? How can one change his/her velocity?

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