FISIKA DASAR

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FISIKA DASAR. By: Mohammad Faizun , S.T., M.Eng . Head of Manufacture System Laboratory Mechanical Engineering Department Universitas Islam Indonesia. MOTION ( Gerak )? Gerak adalah proses berpindahnya suatu objek . Berpindah berarti posisi relatifnya berubah .

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### FISIKA DASAR

Mechanical Engineering Department

Universitas Islam Indonesia

MOTION (Gerak)?

Dari gambardiatas, sebutkanbenda-bendamanasaja yang bergerak! Jelaskan!

Kinds of motion:

• according to the path of objects
• linear motion (translational motion)
• circular motion
• elliptic motion
• projectile motion
• 2. according to the speed of objects
• uniform motion
• the object moves in constant speed
• non uniform motion: speeding up and slowing down.

Straight motion

Straight

motion

Projectile motion

Circular motion

elliptical motion

LINEAR UNIFORM MOTIONDIMENSION 1 (Straight Line)
• Motion in straight path with constant velocity

= velocity (m/s)

displacement (m)

Δt= time span (s)

Make the position vs time graph if the constant velocity is 20 m/s!

Negative direction

Make the position vs time graph if the constant velocity is -20 m/s!

B

A

240 km

• EXERCISE (PR disubmitsenen 26 September 2011)

(Motion in straight path with constant velocity)

• A car moves forward in straight path 100 meters long. The speed is 10 m/s. Find the time needed by the car!
• A bus moves in straight way with velocity 120 km/h. Please convert the speed into m/s!
• The motorcycle goes form A at 07.00 with speed 90 km/h, the ambulance goes from B at 7.30 with speed 100 km/h. Determine the place where they meet and what is the time?

a. kecepatanbendatersebut!

c. tentukanjarak yang ditempuhselama 20 detik!

s (m)

s (m)

50

t (s)

10

t (s)

10

-25

A

B

a. kecepatanbendatersebut!

c. tentukanjarak yang ditempuhselama 20 detik!

s (m)

s (m)

50

50

t (s)

10

t (s)

A

B