phy 01 04 present ppt
TRANSCRIPT
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Physics
1
Unit 1: Motion in One Dimension
Motion …
Kinematics in One Dimension
The source of content for this course is www.physicsclassroom.com
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Physics
2
Lesson Objectives
Students will be able to…• Analyze and evaluate Linear Motion by
Algebraic Means using the Kinematic equations
Lesson 4: 1-D Motion Algebra
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Physics
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Motion Equations
vavg = average velocity (m/s)aavg = average acceleration (m/s2)Δd = df - di = displacement (m)Δt = tf - ti = time (s)Δv = vf - vi = velocity (m/s)
Lesson 4: 1-D Motion Algebra
t
dvavg
t
va avg
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Physics
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Motion Equations
• Set of 4 equations• Used to predict unknown information about an
object's motion if other information is known• Only for motion with• constant velocity (an acceleration = 0 m/s2)• constant acceleration
Lesson 4: 1-D Motion Algebra
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Physics
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Motion Formulas
vi = initial velocity (m/s)vf = final velocity (m/s)a = acceleration (m/s2)d = displacement (m)t = time (s)
Lesson 4: 1-D Motion Algebra
2i at2
1tvd t
2
vvd fi
What if the object starts from rest?
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Physics
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Motion Formulas
vi = initial velocity (m/s)vf = final velocity (m/s)a = acceleration (m/s2)d = displacement (m)t = time (s)
Lesson 4: 1-D Motion Algebra
atvv if
What if the object starts from rest?
ad2vv 2i
2f
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Physics
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Lesson 4: 1-D Motion Algebra
Problem Solving
7-Steps to Highly Effective Problem Solving -1. Construct an informative diagram
2. Identify given information in variable form
3. Identify unknown information in variable form
4. Identify equation which will be used
5. Substitute known values into the equation and solve
6. Show the answer with proper units and significant digits
7. Check your answer to insure it is reasonable and correct
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Physics
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Problem Solving
Example 1: Ima Hurryin is approaching a stoplight moving with a velocity of +30.0 m/s. The light turns yellow, and Ima applies the brakes and skids to a stop. If Ima's acceleration is -8.00 m/s2, then determine the displacement of the car during the skidding process.
Lesson 4: 1-D Motion Algebra
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Physics
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Problem Solving
Example 2: Ben Rushin is waiting at a stoplight. When it finally turns green, Ben accelerated from rest at a rate of a 6.00 m/s2 for a time of 4.10 seconds. Determine the displacement of Ben's car during this time period.
Lesson 4: 1-D Motion Algebra
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Physics
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Problem Solving
Free-falling objects & kinematic equations1. Free fall object has acceleration of -9.8 m/s2
2. If object dropped, initial velocity (vi) is 0 m/s.
3. If projected straight up, it will slow as it rises.• At the peak trajectory, its velocity is 0 m/s. • Initial velocity is equal to final velocity
Lesson 4: 1-D Motion Algebra
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Physics
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Problem Solving
Example 3: Luke Autbeloe drops a pile of roof shingles from the top of a roof located 8.52 meters above the ground. Determine the time required for the shingles to reach the ground.
Lesson 4: 1-D Motion Algebra
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Physics
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Problem Solving
Example 4: Rex Things throws his mother's crystal vase vertically upwards with an initial velocity of 26.2 m/s. Determine the height to which the vase will rise above its initial height.
Lesson 4: 1-D Motion Algebra
Bonus:At what velocity does it hit Rex in the head?How long after throwing it does it hit Rex in the head?
Do Worksheet Problems: Motion Problems
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Physics
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Summary
Problem Solving: Use “7-Steps to Success”
Lesson 4: 1-D Motion Algebra
2i at2
1tvd t
2
vvd fi
atvv if ad2vv 2i
2f