# DAY 13 LETS BEGIN! TODAY AT A GLANCE: 1) A tough example to learn from 2) Some knowledge to demonstrate 3) We APPLY what we know on the boards.

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DAY 13 LETS BEGIN! TODAY AT A GLANCE: 1) A tough example to learn from 2) Some knowledge to demonstrate 3) We APPLY what we know on the boards

A PPLICATIONS WITH R EACTIONS Physics models can help us determine how a person reacted in a situation…

T HE EXAMPLE You are driving down a road at a constant 12m/s, and see a inappropriate panda ahead. It takes you.6 seconds to react, then you hit the brakes and slow at a rate of -1.5m/s 2 till you stop. How far did you travel from sight to stop?

NOW TO THE KNOWLEDGE A panda throws two stones from the top of a building at 20m/s. One is thrown down, one is thrown up. Compare the accelerations of the two stones A) Both have same acceleration B) Thrown up has more acceleration C) Thrown down has more acceleration D) not enough info to solve

KEY IDEA Things in air (Free-falling) without air resistance have the same acceleration even if they have different velocities. Gravity don’t know or care how fast you are going.

NOW TO THE KNOWLEDGE Do heavier things fall faster due to gravity? NO! Mass has no effect on their acceleration.

AND VOTING You drop ball A from a building. 1 second later you drop ball B. As time progresses, the difference in their speeds A) Increases B) Remains Constant C) Decreases D) Cannot be determined

LESSON Since you have the same acceleration, you still gain -9.8 meters every second!

LETS DO SOME HW!~

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