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DO NOW AGENDA Notes: Measuring motion CW #15 Joggers’ Journey 2 Week 13 Thursday Nov 5, 2015 DUE Friday Nov 6 HW#13 Motion practice 1.Turn to LW#8 A Walk in the Park. 2. Add a column to your Part b data table for “speed” 3. Use your averages to Calculate your ACTUAL speeds for Part B Use the equation Walking pace distance (m) in 5 seconds Trial 1 trial 2 trial 3 average Speed (Meters/sec) slow regular fast S = d/t
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Notes # 5 MEASURING MOTION ESSENTIAL QUESTION: How can you determine how fast an object is moving?
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NOS RETAKE Must re-do HANGING WEIGHTS AND BOUNCING SPHERICAL OBJECTS, on a new sheet of paper Must retake the test Tuesday 11/10 At lunch
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1. WHAT IS VELOCITY? The SPEED of an object AND The DIRECTION the object is traveling
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2. How is velocity different from speed? The equation is still the same: s = d/t and v = d/t The only difference is velocity includes DIRECTION OF THE MOTION
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3. What are the units of measurement for velocity? Velocity is a unit rate : unit of distance per unit of time
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Velocity is expressed in whatever units were used for measuring distance and time Examples: m/ sec km/ hr mi/ hr
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WHAT IS THE VELOCITY OF THIS CAR? START POINT END POINT 20 m 100 m TIME = 10 sec VELOCITY = 8 m/sec NE
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WHAT IS THE VELOCITY OF THIS CAR? START POINT END POINT 0 m10 m TIME = 20 sec VELOCITY =.5 m/sec E
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WHAT IS THE VELOCITY OF THIS CAR? START POINT 20 m END POINT 160 m TIME = 7 sec VELOCITY = 20 m/sec S
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4. WHAT IS ACCELERATION? The rate of change in VELOCITY
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GIVEN THAT VELOCITY IS SPEED AND DIRECTION… ACCELERATION OCCURS WHEN AN OBJECT SPEEDS UP (goes faster) SLOWS DOWN (goes slower) CHANGES DIRECTION
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Is it acceleration? > Traveling at 60 km/hr on a straight road? nope < Slowing down for a duck family crossing the road? yep <Speeding up to get to class on time? yesiree <Slowing down to turn a corner? absolutely Turning a corner at a constant rate of speed? You betcha
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5. How can you manipulate the speed equation?
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Let’s try these A cheetah runs 60 meters in 3 sec. What is its average speed?
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HMMM….WHAT AM I SOLVING FOR? A cheetah runs 60 meters in 3 sec. What is its average speed?
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HMMM….WHAT AM I SOLVING FOR? A cheetah runs 60 meters in 3 sec. What is its average speed? ? 60 m 3 sec ÷ 60 m ÷ 3 sec = 20 m/sec D S T
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A cockroach travels 12 meters across your bedroom floor and up to your bed at a speed of 3 meters/second. How long until you wake up screaming?
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HMMM….WHAT AM I SOLVING FOR? A cockroach travels 12 meters across your bedroom floor and up to your bed at a speed of 3 meters/second. How long until you wake up screaming?
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HMMM….WHAT AM I SOLVING FOR? A cockroach travels 12 meters across your bedroom floor and up to your bed at a speed of 3 meters/second. How long until you wake up screaming? ? 12 m ÷ 12 meters ÷ 3 meters/second = 4 seconds 3 m/s D S T
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A snake slithers toward a cute little mouse. In order to reach the mouse, he slithers 5 meters/second for 5 seconds. How far away is the mouse?
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HMMM….WHAT AM I SOLVING FOR? A snake slithers toward a cute little mouse. In order to catch the mouse, he slithers 5 meters/second for 5 seconds. How far away is the mouse?
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HMMM….WHAT AM I SOLVING FOR? A snake slithers toward a cute little mouse. In order to catch the mouse, he slithers 5 meters/second for 5 seconds. How far away is the mouse? ? 5 m/s 5 sec x 5 m/s x 5 sec = 25 m D S T
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CHALLENGE QUESTION: A fish is swimming in the lake at 25 km/hr. He swims for 30 minutes. to reach his home territory. How far away is his territory? D = s x t D = 25km/hr x.5 hr D = 12.5 km
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Write your own word problem where speed is the variable you are solving for. Remember to include the units of measurement for your distance and time
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TOMORROWS DO NOW TURN TO NOTES #5 AND WRITE A WORD PROBLEM WHERE DISTANCE IS THE UNKNOWN AND ANOTHER WHERE TIME IS THE UNKNOWN
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