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What is motion?

Learn the concepts of motion in physics, including speed, velocity, and acceleration. Find formulas and examples to calculate speed, velocity, and acceleration of objects moving in different directions and speeds.

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What is motion?

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  1. What is motion? • When an object’s distance changes relative to a reference point.

  2. What is a reference point? • An object used for comparison to see if something is in motion!

  3. What is the formula for speed? SPEED = DISTANCE TIME

  4. DISTANCE mm, cm, m TIME sec, min, hours SPEED m/sec, km/hr

  5. Ms. Porter walks with a speed of 5 m/min. How long will it take her to walk 7 m? S= d / t therefore t = d / s t = 7 / 5 t = 1.4 min

  6. A horse runs across a field. Find the horse’s constant speed if he runs 21m in 7 seconds. S = d/t S = 21m/7sec S=3m/sec

  7. Calculate the speed of a car that travels 50km in 2 hours S=d/t S=50/2 S=25km/hr

  8. Calculate the speed of a baseball that travels 36m in 3 seconds S=d/t S=36/3 S=12m/sec

  9. A cyclist travels 32 km during the first two hours of riding and 13 km during the next hour. Calculate the average speed. Average speed = total distance / total time Average speed = 32 + 13 / 2 + 1 Average speed = 45 / 3 Average speed = 15 km / hr

  10. If a car travels 85 km/hr, how much distance will the car cover in 3 hours. S = d / t therefore d = (s)(t) d = (85)(3) d = 255 km

  11. WHAT IS VELOCITY? • SPEED IN A GIVEN DIRECTION!

  12. The Atlanta Falcons are traveling to Miami to play the Dolphins. The team bus travels at 90km/hr. What is the velocity of the bus. 90km/hr southwest

  13. 3456 mm = ? m 3.456 m

  14. WHAT IS ACCELERATION • When an object does ANY of the following, it is called acceleration… • Speeds up • Slows Down (deceleration) • Changes Direction

  15. A roller coaster car picks up speed as it rolls downhill. When it starts the car’s speed is 4m/sec, but 3 seconds later it’s speed is 22 m/sec. What is the acceleration? a = Fv – Iv / time a = 22 – 4 / 3 a = 18 / 3 a= 6 m/sec2

  16. A car ad states that a certain car can accelerate from 0-90km/hr in 11 seconds. What is the acceleration? a = Fv – Iv / t a = 90 – 0 /11 a = 90 / 11 a = 8.18 km/hr/sec

  17. A student runs down the hall at 1.2m/sec. After 3.2 sec he is moving 3.6 m/sec. What is the student’s acceleration? a = Fv – Iv/ time a = 3.6 – 1.2 / 3.2 a = 2.4 / 3.2 a = 0.75 m/sec2

  18. Christina is running to catch the bus at an impressive 18 m/sec. She realizes she can’t make the bus and she slows down and stops in 4.5sec a = Fv – Iv/ time a= 0 – 18 / 4.5 a = -18/4.5 a = - 4 m/sec2

  19. How much time does it take a bird flying at a speed of 45 km /hr to travel 1,800km? s = d / t therefore t = d / s t= 1800 / 45 t = 40 hours

  20. If Bert the bat travels eastward at 40 km/hr with a tailwind of 6 km/hr, what is his actual speed? 46 km/hr

  21. Convert 1 km/hr to m/min 1 km x 1000 m = 1000 m hour 1 km hour 1000m = 1 hour = 1000m = 16.67 m/min hour 60 min 60min

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