Last First Date Per SETTLE LAB: Speed AND Velocity (pp for help) SPEED. Variables. Variables

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1 DISTANCE Last First Date Per SETTLE LAB: Speed AND Velocity (pp for help) Pre-Activity NOTES 1. What is speed? SPEED What is the formula used to calculate average speed? 3. Calculate the average speed of a baseball that goes 70 meters in 1.5 seconds (SHOW WORK WITH UNITS TO THE RIGHT) Calculate the average speed of a flat piece of paper dropped horizontally from 1.5 meters high. Use the boxes below to keep track of your work. Calculate the average speed of a crumpled piece of paper dropped from 1.5 meters high. Use the boxes below to keep track of your work Why do you think the two pieces of paper fell at different average speeds? USE the TIME / DISTANCE GRAPH BELOW TO SHOW WHAT THE TWO OBJECTS ARE DOING (USE RED FOR THE CRUMPLED PAPER AND BLUE FOR THE FLAT PAPER (if you don t have red and blue make a KEY) What is true about the slope of the faster object? TIME

2 Materials: String with Washer Attached. VELOCITY 1. Describe how VELOCITY and SPEED are SIMILAR 2. Describe how they are DIFFERENT 3. Get a string with a washer attached to it. Swing it in a circle carefully at a constant speed. It might help to swing it in a circle on a piece of paper labeled NORTH, SOUTH, EAST, WEST. Diagram what you did(draw a picture of this) Explain what is happening in terms of SPEED and in terms of VELOCITY. In other words, how is it true that SPEED stayed the SAME but VELOCITY CHANGES!!! 4. Give another example in real life of how Speed can stay the same but velocity changes. 5. What are 3 Ways to change velocity? 6. What is a vector (Mr. Settle will discuss)?

3 COMBINED VELOCITY (pp 111) Make a diagram USING VECTORS (arrows labeled with speed and direction) that shows the following scenarios: You are standing on a street. A bus goes by you moving 20m/s East. A person on the bus is walking forward on that bus at 2 m/s East relative to the bus. Draw a picture using vectors and labels showing their relative velocities. What is their combined velocity to you on the street? Diagram Math Work You are standing on a street. A bus goes by you moving 18m/s East. A person on the bus is walking forward on that bus at 2 m/s West relative to the bus. Draw a picture using vectors and labels showing their relative velocities. What is their combined velocity to you on the street? Diagram Math Work 7. General Rule for COMBINING VELOCITIES When Items are moving in the same direction, When Items are moving in the opposite you their velocities to figure out direction, you their velocities to their relative velocity. figure out their relative velocity.

4 MASTERY QUALITY WORK RESULTANT VELOCITY FOR AN ITEM MOVING AT RIGHT ANGLES You are standing on a river bank. There is a boat moving at 15 km/h South relative to the water. The water is moving at 7 km/h East. You are an observer on land. What is the RESULTANT VELOCITY OF THE BOAT to an OBSERVER ON LAND? Draw a picture of the scenario drawing from a TOP VIEW PERSPECTIVE with vector arrows. CALCULATE THE RESULTANT VELOCITY (SHOW WORK) HINTS: Can you create a right triangle out of the above situation. HINT #2: Pythagorean theorem Resultant Velocity (Include speed and direction)

5 NOTES: SPEED and VELOCITY (MUST BE COMPLETE FOR RETAKE) 1) Describe Speed? (REVIEW) Define Units to calculate: (Video review) 2) Calculate speed for the following examples. (REVIEW) A) If you walk for 2 hours and travel 8 km, what is your average speed? (REQUIRED) B) During the H Run, you go the first 200m in 30 seconds, the next 500m in 190 seconds, and the last 100 meters in 25 seconds. What is your average speed? 3) Make Time vs Distance Graphs for the following. Constant Speed Speeding Up (REQUIRED) Slowing Down Stopped 4) Describe Velocity Definition:

6 (REVIEW) Examples of Changes in Velocity: (Video review) Vectors 5) How do you combine Velocities? (RESULTANT VELOCITY) Bus or Moving Sidewalk EXMAMPLE (SAME DIRECTION) (OPPOSITE DIRECTION) (90 DEGREE ANGELE ) Mastery Quality online tutorial

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