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# Chapter 9

## by PhysicsJackson on Jan 31, 2008

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## Chapter 9Presentation Transcript

• Speeding Up, Slowing down
• What happens to objects when they move?
• Acceleration
• Define to the person next to you, the terms:
• Velocity
• Displacement
• Acceleration
• Acceleration
• Acceleration is
• Change in Velocity / Time Taken
• Some definitions:
• S = displacement
• U = initial velocity
• V = final velocity
• A = acceleration
• T = time taken
Therefore acceleration is written: a = (v – u) / t Can we sketch a graph of this?
• In this example a = (20 – 0) / 11 = 1.8 ms -2 followed by zero acceleration (constant velocity)
• v = u + at This is the first equation of motion where acceleration is uniform…
• Example
• What is the final velocity of a car that accelerates from a velocity of 25ms -1 at an acceleration of 4ms -2 for 20 seconds? What would it be if it started from rest at the same acceleration and time?
• v = u + at = 25 + 4 x 20 = 105 ms -1
• From rest v = at = 80 ms -1
• How far would something travel..?
• Using the SUVAT terms, can you express displacement?
• Think about Speed = ..?
• These are the other 3 equations that you need to know how to use…
• Exercises