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Changing speed and velocity
Changing speed and velocity
Changing speed and velocity
Changing speed and velocity
Changing speed and velocity
Changing speed and velocity
Changing speed and velocity
Changing speed and velocity
Changing speed and velocity
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Changing speed and velocity

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  • 1. Changing speed and velocity:
  • 2. How do you describe that a car or object changes its speed or velocity? • When it slows down • When it speeds up In what situations or places where cars happen to change the speed? • When it is travelling in a high way its speed increases. • When it travels in a traffic road the speed decreases • When it turns a curve path the car also slows down.
  • 3. What do you call this rate of change in velocity of the object? • It is called acceleration. • In formula we can write acceleration as: • Acceleration= change in velocity • elapsed time • In symbol: • a = Δv or a = vf - vi Δt tf - ti
  • 4. Vf is final velocity , vi is initial velocity tf is final time , ti is initial time What is the MKS unit of acceleration? The MKS unit of acceleration is meter per second squared, in symbol m/s². Other unit is the km/h²
  • 5. Application: • Solve the given problems: • 1. A car on a straight level road is stopped for a red light. On the green light, it uniformly accelerates to a velocity of 18m/s in 3 minutes. What is its acceleration? • A jet plane flying at 100m/s is uniformly accelerated to a cruising speed of 150m/s in 20 minutes. What is its acceleration during this time?
  • 6. Reinforcement: • Which of the following is a graph of acceleration? • A. B. C. v v v t t t Answer: All of them show a graph of acceleration. Why?
  • 7. • 2. How do you describe the slope of graph A? graph B? Graph C ? Answer: Graph A has a positive slope Graph B has zero slope Graph C has negative slope 3. What does a positive slope mean? A zero slope? A negative slope?
  • 8. • Answer: • Positive slope means it has a constant acceleration, the velocity changes but at constant rate.Constant acceleration is also called uniformly accelerated motion. • Zero slope means no acceleration but the car is still moving with constant velocity. • Negative slope means the acceleration is constant at decreasing velocity, when the velocity decreases its called deceleration.
  • 9. Analyze the following graphs of acceleration • A. B. C. v v v t t Which graph shows constant acceleration? Answer: All of them Which graph shows highest or greatest acceleration? Answer: graph A, why? t

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