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Motion

Motion. Speed, Velocity, and Acceleration. Frames of Reference. The object or point from which movement is determined Movement is relative to an object that appears stationary Earth is the most common frame of reference. Questions. What is the frame of reference for the sunset?

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Motion

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  1. Motion Speed, Velocity, and Acceleration

  2. Frames of Reference • The object or point from which movement is determined • Movement is relative to an object that appears stationary • Earth is the most common frame of reference

  3. Questions • What is the frame of reference for the sunset? • What is a frame of reference? • What is the most common frame of reference?

  4. Question • When can you determine how fast you are going in a jet plane?

  5. Motion • Motion is a change in position relative to a frame of reference • Speed is the distance traveled in a given amount of time • Speed=distance • time

  6. Speed • The units for speed: • meters/second (m/sec) • kilometers/hour (km/hr) • Speed that does not change is constant speed

  7. Average speed • Total distance divided by the total time • Formula: • Total distance total time

  8. Velocity • Speed in a given direction • Velocities in the same direction combine by adding • Velocities in different directions combine by subtracting

  9. Interesting fact • Rockets are launched in the same direction of the earth’s rotation to get an extra boost of 1800 km/hr to its speed

  10. Questions • What is motion? • What is speed? How is it calculated? • What is average speed?

  11. Questions • How is velocity different from speed? • Which two factors determine an object’s velocity?

  12. Acceleration • The change in velocity • Acceleration is measured in m/sec/sec or m/sec2 • Formula is: • (final velocity - original velocity)/time

  13. Deceleration vs. Acceleration • A decrease in velocity is deceleration or negative acceleration • A distance-time graph for acceleration is always a curve

  14. Centripetal Acceleration • Acceleration directed toward the center of circular path

  15. Questions • What is acceleration? • What is the shape of a distance-time graph for acceleration? • What is centripetal acceleration?

  16. Momentum • Momentum is equal to the mass of an object times its velocity • momentum= mass x velocity

  17. Conserving Momentum • The law of conservation of momentum states that the total momentum is NOT lost, only transferred

  18. Questions • What is momentum? • What happens to momentum as the mass of a moving object increases? • What is the formula for momentum? • What is the law of conservation of momentum?

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