Speed and Velocity.

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Presentation transcript:

Speed and Velocity

What is the difference between distance and displacement? For example, if a trip was recorded on the above line… Let’s say that a person walked 5 paces from the left end and rested for several minutes. Then they continued to travel in the same direction for more 10 paces before turning 180 degrees and walking 8 paces. How far from their origin are they?

Speed vs. Velocity Speed = distance/time Velocity = distance/time in a given direction For physics, distance=meters, time=seconds unless otherwise noted

Instantaneous speed or velocity is determined by calculating the slope of a graphed trip at a specific point OR using a speedometer and compass Average speed is more commonly used! Average speed=total distance/total time

Example1: Your Best friend lives 4 miles away. Your thinking green so you ride your bike to their house. If it takes 10 minutes to get there, what is your average speed in mi/min? what is your average speed in m/sec?

Example 2: A cheetah can maintain a speed of 25m/s. At this rate, how far will the cheetah run in 10 seconds? In one minute?

Velocity Again… Velocity is speed with direction!! Change in velocity requires a change in speed (speed up or down), a change in direction (turning a corner), OR BOTH!!

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Create a velocity graph for the following story problem: A walker starting from rest travels 10 meters to the right from time 0 to 3 seconds. They then travel another 30 meters to the right in the next 3 seconds.

On the same graph: A second walker starting from rest travels 15 meters to the right from time 0 to 4 seconds. Then turns and walks 25 meters to the left in the next 5 seconds.

Homework: Page 44 #1-6