Engineering Department Physics1/31/2018 1

PHYSICS

Nila Alia, M.Pd.Engineering DepartmentPoliteknik Negeri Malang

email: nilaalia5774@gmail.com

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At the end of the lesson, you will be able to:

1. Determine different of distance and diplacement

2. Define velocity

3. Define acceleration

4. Calculate distance, velocity, and acceleration

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Pre Test

A drone needs to reach 50 m/s to take off, if the drone’s accelerationIs 2,1 m/s2 , how many seconds does it take to reach take off speed?

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Description

Linear Motion is motion of an object along straight line path

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Symbols of Linear Motion

Vav = average velocityt = timeVo = initial velocityV = final velocitya = accelerations = distance covered

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Distance

distance = average velocity x time

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What is different of distance and Displacement???

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Different of distance and Displacement

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Different of distance and Displacement

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Example 1

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Correct Answer

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t

va

vo

+ or -

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How About

V ?? Vav ??&

Vertical??

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Example 2

A remote control car accelerates from rest across a parking lot at 1,5 m/s2 and it does so far 12 s. What distance did it travel during this time?

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Correct Answer for Example 2

s = 0 + ½ (1,5 m/s2 ) (12)2

s = (0,75 m/s2 ) (144)s2

s = 108 m

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Example 3

Andrew throws a ball vertically. He notices it reaches a maximum height of 10 meters. What was the initial velocity of the ball? (g=9,8m/s2 )

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Correct Answer for Example 3

0 m2/s2 = Vo2 + 2 (-9,8 m/s2)(10m)

0 m2/s2 = Vo2 - 196 m2/s2

Vo2 = 196 m2/s2

Vo = 14 m/s

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Post Test

A drone needs to reach 50 m/s to take off, if the drone’s accelerationIs 2,1 m/s2 , how many seconds does it take to reach take off speed?

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Correct Answer Pre-PostTest

V = Vo + a.t50 m/s = 0 + 2,1 m/s2.t50 m/s = 2,1 m/s2.tt = 50 m/s : 2,1 m/s2

t = 23,8 s

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CONCLUSION???

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To be Continue