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Displacement with constant accelerationPowerPoint Presentation

Displacement with constant acceleration

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## PowerPoint Slideshow about ' Displacement with constant acceleration' - clarke-forbes

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### Displacement with constant acceleration

How far, how fast?

Review of vavg

- We have seen a way to calculate vavg already:
vavg= Δx / t

- Let’s look at the Old School way to find an average….

Finding an average…

- If you wanted to find the average of these numbers:
5,3,7 and 5

You would just add them up and divide by 4

Mmmk.

Finding an average…

- You can do the same thing with velocities
- Suppose a car accelerates from 0m/s for 30 sec at 1m/s2.

That’s gonna take forever to do!

Finding an average….

- OR… There’s a much easier way:
- If acceleration is constant (it always will be for us.) average the first and last velocities and you get the same answer.

Oh, good!

Example

- A racing car reaches a speed of 42 m/s. It then begins a uniform negative acceleration, using its parachute and braking system, and comes to rest 5.5s later. Find the distance that the car travels during braking.

Example

- A racing car reaches a speed of 42 m/s. It then begins a uniform negative acceleration, using its parachute and braking system, and comes to rest 5.5s later. Find the distance that the car travels during braking.
- Givens: vi=42 m/s t= 5.5 s vf=0 m/s Δx= ?

Example

- A racing car reaches a speed of 42 m/s. It then begins a uniform negative acceleration, using its parachute and braking system, and comes to rest 5.5s later. Find the distance that the car travels during braking.
- Givens: vi=42 m/s t= 5.5 s vf=0 m/s Δx= ?
- Formula:

Example

- Givens: vi=42 m/s t= 5.5 s vf=0 m/s Δx= ?
- Formula:

Practice

- For classwork, complete Practice C, Pg. 53

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