Motion Unit 2 Chapter 11.1 & 11.2 Distance vs. Displacement Speed and Velocity.

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Presentation transcript:

Motion Unit 2 Chapter 11.1 & 11.2 Distance vs. Displacement Speed and Velocity

Frame of reference To describe motion accurately and completely, a frame of reference is necessary. Frame of reference is a system of objects that are not moving with respect to one another. Choosing a meaningful frame of reference allows you to describe motion in a clear and relevant manner.

If you are standing beside the tree on the left what is moving? If you are on the train what is moving? If you are riding down the road on a buss is your friend moving beside you? Are the road signs moving?

If you are on the plane what is moving from your frame of reference? If you are beside the tree what is moving from your frame of reference?

Displacement vs. Distance Distance is the total length traveled Displacement is the distance measured directly from starting to stopping point. – What is the distance traveled on the path below? – What is the displacement?

A runner leaves his house and runs two blocks east, then three blocks south and finally 1 block west. – How far has the runner traveled? – What is his displacement? What is the distance traveled of a race car driver in the Indy 500? What is the displacement of a race car driver in the Indy 500?

Velocity and speed Both are calculated by dividing distance by time. Velocity = distance/time speed= distance/time Velocity had a direction, speed does not. – UNITS of speed and velocity is meter/second or kilometer/hour 1. A runner ran 400 meters for 40 seconds. At what speed did he run?

Velocity and speed 2. What is the speed of a bobsled whose distance-time graph indicates that it traveled 150 m in 25 s?

Velocity and Speed 3. A runner traveling at 4.25 m/s will travel how far in 23 s?

Velocity and Speed 4. How long will it take a runner going 4.25 m/s to travel 50.0 meters?

Magic Triangle with units

Graphing Speed A distance-time graph is a good way to describe motion The slope of a line on a distance-time graphs is speed

What is the objects average speed? What is it’s speed between 6s and 10 s? When is it traveling the fastest?

Where is the object standing still? Where is the object traveling backwards? Where is the object traveling at 5m/s? What is speed at line E?