Motion in 1D

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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

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

B

A

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