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## PowerPoint Slideshow about ' Motion' - samira

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### Motion

Pg. 322-332 in your textbook.

What is Motion?

- All matter in the universe is constantly in motion, from the revolution of Earth around the Sun to electrons moving around the nucleus of an atom.

- Anything in motion changes position.

Speed

- Speed is the distance traveled divided by the time it takes to travel that distance.

- Speed is calculated from the following equation:

Speed Practice #1

- This motorcycle travels 100-m in 10.2 seconds. What is the speed of this motorcycle to the nearest 10th?

- Answer: 9.8 m/s

Speed Practice #2

- A runner completes a 400-m race in 43.9 s. In a 100-m race, he finishes in 10.4 s. In which race was his speed faster (nearest 10th)?

- Answer: The runner’s speed was 9.1 m/s in the 400-m race and 9.6 m/s in the 100-m race. Therefore, he is faster in the 100-m race.

Velocity

- Velocity is the speed of an object and the direction of its motion.

- This would be used, for example, if you were hiking in the woods since you would want to know your speed AND the direction you were moving.

- Velocity is calculated using the speed equation AND direction.

Velocity Practice

- Calculate the velocity of a dancer who moves 5 ft to the left of the stage over 15 min (nearest hundredth).

- Answer: 0.33 ft/min left

Acceleration

- Acceleration is the change in velocity divided by the time it takes for the change to occur.

- Acceleration is calculated from the following equation:

Acceleration Practice #1

- A bicycle accelerates from rest to 6 mi/s in 2 s. What is the bicycle’s acceleration?

- Answer: 3 mi/s2.

Acceleration Practice #2

- Find the acceleration of a train whose speed decreases from 17 m/s to 7 m/s in 120 s (nearest thousandth).

- Answer: -0.083 m/s2

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