Menggunakan formula kerja, ( W = F \cdot s ), kita dapat hitung kerja yang dilakukan: [ W = 20 , \textN \times 5 , \textm = 100 , \textJ ]
When the string is pulled at an angle, the vertical component of the pulling force (( F \sin \theta )) reduces the normal force (( R )) of the block on the surface. Since friction (( f )) is proportional to normal force (( f = \mu R )), friction decreases as angle increases. To maintain constant velocity (if required), the spring balance reading may actually change. However, if the question asks purely about theoretical work , we ignore friction.
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