Page 6 - Modul A+1 Fizik Tingkatan 5

6. Daya paduan dan gerakan lif. / Resultant force and motion of lift.

Jenis gerakan lif dan berat ketara
Type of motion of lift and apparent weight

Pegun Memecut ke atas Memecut ke bawah BAB 1
Stationary Accelerate upward Accelerate downward

Mesin Mesin Mesin
R penimbang R penimbang R penimbang
Weighing Weighing Arah Weighing Arah
scale scale pergerakan scale pergerakan
Direction of Direction of
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motion motion

W Lif W Lif W Lif
Lift Lift Lift
Daya paduan/ Resultant force Daya paduan/ Resultant force Daya paduan/ Resultant force
0 R − W = ma W − R = ma
Berat ketara/ Apparent weight Berat ketara/ Apparent weight Berat ketara/ Apparent weight
R = W R = ma + W R = W – ma
R = mg R = ma + mg R = mg – ma

7. Daya paduan dan sistem takal / Resultant force and pulley system
(a) Apabila satu daya, F menarik beban menggunakan takal licin, tegangan tali, T adalah sama dengan
daya tarikan, F (F = T).
When a force, F used to pull a load over a pulley, the tension, T is equal to the pulling force, F (F = T).

Situasi/ Situation Rajah/ Diagram Analisis daya/ Force analysis
Beban pegun atau Daya dikenakan/ Applying force;
Takal licin
bergerak dengan halaju Smooth pulley F = ma
seragam, maka pecutan, a T T – mg = ma
T
adalah sifar
Load is stationary or move Oleh kerana/ Since, a = 0
with constant velocity, then ➮ T – mg = 0
acceleration, a is zero T = mg
Oleh kerana/ since, F = T
F ∴ F = mg = W

W = mg

Beban ditarik ke atas Takal licin Daya dikenakan/ Applying force;
dengan pecutan, a maka Smooth pulley F = ma
tegangan, T . mg T T – mg = ma
The load is pulled upwards T T = ma + mg
with an acceleration, a, then a
tension, T . mg Oleh kerana / Since, F = T
∴ F = mg + ma

F

W = mg

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01_Modul A+ Fizik Tg5.indd 3 28/10/2021 10:57 AM