Chapter 9
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The document discusses acceleration, velocity, and displacement. It defines acceleration as the change in velocity over time. It provides examples of using the SUVAT equations to calculate final velocity and displacement given initial velocity, acceleration, and time. Specifically, it shows calculating the final velocity of a car accelerating from 25 m/s at 4 m/s^2 for 20 seconds, and from a start of rest under the same conditions. It also briefly introduces the concepts of horizontal and vertical motion and treating their acceleration components separately.
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- 1. Speeding Up, Slowing down What happens to objects when they move?
- 2. Acceleration Define to the person next to you, the terms: Velocity Displacement Acceleration
- 3. 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?
- 4. In this example a = (20 – 0) / 11 = 1.8 ms -2 followed by zero acceleration (constant velocity)
- 5. v = u + at This is the first equation of motion where acceleration is uniform…
- 6. 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? Answer: v = u + at = 25 + 4 x 20 = 105 ms -1 From rest v = at = 80 ms -1
- 7. How far would something travel..? Using the SUVAT terms, can you express displacement? Think about Speed = ..?
- 8. These are the other 3 equations that you need to know how to use…
- 9. Exercises Answer Question on sheet Questions 1, 2, 4 and 6
- 10. Vertical and Horizontal Motion http://www.rmutphysics.com/charud/virtualexperiment/virtual2/monkey-hunter/index.html
- 11. Components of Motion Horizontal and Vertical components are treated separately Acceleration is generally considered to be: Zero horizontally g vertically ( = 9.8 ms -2 on Earth) The SUVAT equations are applied separately