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Chapter 11: Motion

Chapter 11: Motion. Section 11.2 Speed and Velocity. Speed. Speed is the ratio of the distance an object moves to the amount of time an object moves. The SI unit of speed is meters/second (m/s). Average speed is calculated for the entire duration of a trip.

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Chapter 11: Motion

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  1. Chapter 11: Motion Section 11.2 Speed and Velocity

  2. Speed • Speed is the ratio of the distance an object moves to the amount of time an object moves. • The SI unit of speed is meters/second (m/s). • Average speed is calculated for the entire duration of a trip. • Instantaneous speed is measured at a particular instant in time.

  3. Average Speed • Average speed is the total distance traveled divided by the total time it takes to travel that distance. • Formula: Average speed = total distance OR v = d/t total time

  4. Example Problem • When traveling on vacation, you measure the times and distances traveled. You travel 35 kilometers in 0.3 hour, followed by 53 kilometers in 0.8 hour. What is your average speed? • 35 + 53 = 88 total distance • .3 + .8 = 1.1 total time • 88/1.1=80 km/hr average speed

  5. Graphing Motion • A distance-time graph is a helpful way to show motion. • The slope of a line on a distance-time graph is speed.

  6. Velocity • The speed and direction in which an object is moving are called an object’s velocity. • Velocity is a description of both speed and direction of motion. • What could cause a change in velocity? • speed and velocity clip

  7. Velocity • Velocity is a vector. • Vector: a quantity that has magnitude (size, length, or amount) and direction • Vector addition

  8. Combining Velocities • The motion of an object can involve more than one velocity. • If so, combining these velocities is using vector addition.

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