A boy is pulling on a box at a 31 degree angle using 21N of force. The box remains stationary. The co-efficient of static friction is 0.55. What is the minimum mass?(adsbygoogle = window.adsbygoogle || []).push({});

When I use the component method to solve this problem, do I need to calculate the mass for both the Horizontal and the Vertical and add them up? Or just the Horizontal?

(I ask this because when I solved for horizontal, the textbook said it was wrong. However, when I solved for both vertical and horizontal, I got the right answer)

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# Simple but unsure, compound questions

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