what is motion???
DESCRIPTION
What is Motion???. Motion —the movement of an object in relation to something considered stationary(a frame of reference)!!!. Frame of Reference. Motion Terms:. Distance vs. Displacement Distance —How far you move. Displacement —How far you are from where you started!!. 50 m. - PowerPoint PPT PresentationTRANSCRIPT
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What is Motion???
Motion—the movement of an object in relation to something considered stationary(a frame of reference)!!!
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Frame of Reference
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Motion Terms:
• Distance vs. Displacement– Distance—How far you move.– Displacement—How far you are from where you
started!!
50 m
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A Student walks from A to B to C to D and back to A. What distance did the student travel?
A.0 metersB.6 metersC.10 metersD.12 meters
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A Student walks from A to B to C to D and back to A. What is the student’s displacement?
A.0 metersB.6 metersC.10 metersD.12 meters
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Distance Vs. Displacement
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• Speed vs. Velocity– Speed—How fast you move!!– Velocity—Speed in a particular direction!!
Other Motion Terms:
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Instantaneous vs. Average SpeedInstantaneous Speed• The speed at any instant in
time.
Average Speed• Total distance divided by
total time.
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The Velocity Equation:
• Where: d is distance(displacement)----given in m or km t is time----given in s or hr v is velocity-----given in m/s or km/hr
Same equation used for speed!!!
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Solving Word Problems:
1. Write down what you are given(the important stuff like #’s, etc.).
2. Write down what you are looking for!3. Find an equation that fits what you have.4. Solve the equation for what you are looking
for!5. Plug and Chug!!
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Using the Velocity Equation:
Ex.) A person walks 50 m in 12 s. At what velocity did the person travel?
Given:d = 50 mt = 12 s v = ?
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Ex.) A car is moving down the road at 25 m/s. How far will it travel in 18 s?
Given:v = 25 m/st = 18 sd = ?
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Ex.) A whale is swimming across the ocean at 14 m/s. How long will it take the whale to swim 1000 m?
Given:v = 14 m/sd = 1000 m t = ?
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A car moves a distance of 2400 m in 55 s. How fast is the car moving?
A. 32 m/sB. 44 m/sC. 60 m/sD. 72 m/s
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A little girl walks 75 m to his grandmother’s house at 3 m/s. How long will it take her to walk that distance?
A.225 sB.78 sC.35 sD.25 s
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Distance Vs. Time Graphs
What can be determined by the slope of a distance time graph?
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When does the slope of a distance
time graph = velocity?
Yo Adrian, You know, You know it’s Always !!!
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Straight Line, therefore constant Velocity!!
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Line not straight, therefore velocity not constant. If velocity is not constant, object must be accelerating!!
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In which of the following graphs is the runner running the fastest?
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Which of the following graphs indicates that one of runners started 10 yards ahead of the other?
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In which of the following graphs are both runners moving at the same speed?
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Which sentence best describes the runner whose distance-time graph is shown?
A. The runner ran forward for 2 seconds, and then he ran backward for 2 more seconds. B. The runner ran forward for 2 seconds, and then he stood still for 2 more seconds. C. The runner ran forward for 2 seconds, and then he ran forward at a slower pace for 2 more seconds. D. The runner ran forward for 2 seconds, and then he turned right and continued forward at the same speed for 2 more seconds.