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Published byViviana Ransford Modified over 5 years ago

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**You know an object is in motion if it is changing position.**

Matter and Motion You know an object is in motion if it is changing position. You know an object is changing position if it moves relative to a reference point.

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**Distance and Displacement**

Distance is the length of the route you will travel. Displacement is the direction and difference in position between your starting and ending points.

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**Distance and Displacement**

On your notes page, draw two examples of displacement. The first one with a displacement of zero, and the other with a displacement of 10 meters. Turn to your partner to check your drawings.

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**Speed = distance (d) / time (t)**

Speed (v) = the distance an object travels in a unit of time. (How rapidly a distance is covered.) Speed = distance (d) / time (t) units are m/s

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**Draw Picture of the formula triangle**

v= d/t

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Practice Problems A runner completes a 400-m race in 43.9 s. In a 100-m race, he finishes in 10.4 s. In which race was his speed faster? A passenger train travels from Boston to New York, a distance of 350 km, in 3.5 h. What is the train’s speed?

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**Average Speed/Instantaneous Speed**

Average speed = total distance traveled divided by the total time taken. Instantaneous speed is the speed of an object at one instant of time.

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Graphing Motion We will be working with Distance-Time graphs. For this type of graph, time is plotted on the horizontal axis and distance is plotted on the vertical axis.

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Graphing Motion Copy the chart below onto your notes page, and create a Distance-Time graph using the information. Bicycle Race Data Time (h) Distance (km) 1 8 2 16 3 24 4 32 5 40

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**Velocity = speed in a given direction. (magnitude & acceleration)**

Example: flying at 600 km/h east Driving at 120 km/h south Question: Could you use a distance-time graph to show velocity? Why or why not?

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Velocity Answer: No, because a distance-time graph would not show the direction of motion

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**Average Classes Stop Notes Here. Just Discuss **

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**Combining Velocities example:**

Rowing down a river River = 15 m/s You paddle down 4m/s Velocities combine, your total velocity is 19 m/s down stream.

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**Acceleration = to change in velocity / time to make change.**

Acceleration = rate of change of velocity. (ex. Car changing speed & direction…swerving) Velocity = (final velocity – original velocity) Acceleration = to change in velocity / time to make change.

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