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# Motion in 1D - PowerPoint PPT Presentation

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.

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

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Presentation Transcript

### Motion in 1D

From the Simpsons

• We have talked a lot about Forces being balanced.

• When forces are unbalanced it results in the object accelerating.

• 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

• 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 is change in distance over the change in time.

• Measured in Meters/sec

• Always positive

• A scalar quantity

• 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.

V = displacement change in time

• 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

• 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 -)

• 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

• 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 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