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## PowerPoint Slideshow about ' Motion in 1D' - wilmet

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### Motion in 1D

From the Simpsons

Imbalance of forces

- We have talked a lot about Forces being balanced.
- When forces are unbalanced it results in the object accelerating.

Distance

- Any time an object moves it moves a distance. In the picture the Simpson family has moved a distance from their house.
- This is measured in meters, and is always positive.
- A scalar quantity

Displacement

- The change in the position of the particle
- Homer gets up from the couch and goes to the refrigerator. Then he comes back. His displacement is zero
- Measured in meters
- A vector quantity

A

Displacement Example- Homer is chasing Bart around the house. He catches him at point B, What is the distance and displacement?

Speed

- Think of your car
- Speed is change in distance over the change in time.
- Measured in Meters/sec
- Always positive
- A scalar quantity

Velocity

- Like speed, but with another component: Direction
- Measured in m/s
- A vector Quantity
- Velocity is important when you are trying to go to a specific destination.

Velocity Formula

V = displacement change in time

Velocity Problem

- Marge leaves from the store. She travels 1 km for 10 m/s west. Then she needs to pick up the pace and get home before Homer does. She increases her velocity to 20 m/s west for 1 km. What is her average velocity

Acceleration

- Is what happens when you change velocity over time.
- Measured in m/s2
- A vector quantity
- Is the result of imbalanced forces
- Can result when
- You speed up/ slow down
- Turn

- We assume that this is uniform
- Has a sign (+ or -)

Sideshow Bob has escaped

- Bart gets on his bike to escape the madman and goes from rest to 10 m/s in 10 seconds. What is his average acceleration

Braking

- Marge is moving at 10 m/s when she has to hit the brakes to avoid a boy on a skateboard. How long does it take her to stop if her average acceleration is -5 m/s2

Free Fall

- Free fall is another example of 1D motion just in the Y direction
- The acceleration in these problems is known:
- -9.8 M/S2
- The acceleration due to gravity
- Typically seen as a negative value due to the fact that gravity pulls down

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