Motion Speed, Velocity, Acceleration & Forces - PowerPoint PPT Presentation

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Motion Speed, Velocity, Acceleration & Forces
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Motion Speed, Velocity, Acceleration & Forces

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  1. Motion Speed, Velocity, Acceleration & Forces

  2. Frame of Reference Object or point from which motion is determined

  3. What is Motion? Motion: A change in position of an object compared to a reference point Motion involves all of the following:

  4. What is motion? • If you are standing in one place, and your friend walks by you, are you moving relative to your friend? • Is your friend moving relative to you? • Is either of you moving relative to the earth?

  5. Answer: • You are moving relative to your friend, and your friend is moving relative to you! • You (the Joker) are not moving relative to the earth, but your friend is. You are both moving relative to the sun!

  6. What is motion? • If you and your friend are walking down the hall together at the same speed, in the same direction, are you moving relative to your friend? • Is your friend moving relative to you? • Are either of you moving relative to the earth?

  7. Answer: • You are NOT moving relative to your friend, and your friend is NOT moving relative to you. You both are moving relative to the earth.

  8. What is Motion? = distance time

  9. Speed Example: A car travels 300km in 6 hours. What is the speed of the car?

  10. Answer: • Speed = distance ÷ time • Speed = 300km ÷ 6 hours • Speed = 50km/hr

  11. More practice • 1. How far can a plane travel if it flies 800km/hr for 9 hours? • 2. How long does it take a ship to go 500 km if it travels at a speed of 50km/hr?

  12. Answers • 7200km/hr • 10 hours

  13. What is Motion?

  14. Velocity • Speed in a given direction. • What is the velocity of a boat that travels from Lancaster to Baltimore(10 miles) in 15 minutes?

  15. Answer • Speed = distance ÷ time • Speed = 10 miles ÷ 15 minutes • Speed = 0.67 mi/min • Velocity = 0.67 mi/min NW

  16. Acceleration • Change in velocity • Can be change in speed or direction

  17. Acceleration = Vfinal – Vinitial • Time or • = ∆Velocity • Time

  18. Acceleration problem • A roller coaster’s velocity at the top of a hill is 10m/s. Two seconds later it reaches the bottom of the hill with a velocity of 26m/s. What is the acceleration of the roller coaster?

  19. ANSWER: a = 26m/s – 10m/s 2 s a = 16m/s 2s a = 8m/s/s or 8m/s2

  20. What is a Force? FORCE = Any push or pull which causes something to move or change its speed or direction

  21. What is a Force? Forces can be BALANCED or UNBALANCED • Balanced forces are equal in size and opposite in direction • UNbalanced forces are not equal in size and/or opposite in direction. If the forces on an object are UNBALANCED, we say a NET force results.

  22. Determine the NET FORCE: