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secondary 4 | Physics
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qwerty
Qwerty

secondary 4 chevron_right Physics chevron_right Singapore

How to solve this question with the help of diagrams?

Date Posted: 3 years ago
Views: 420
Ben Chua
Ben Chua
3 years ago
You can also think of the additional "apparent weight" due to the acceleration of the lift as an additional force, but would make the working quite a bit messier

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Ben Chua
Ben Chua's answer
3 answers (Tutor Details)
1st
Sorry for earlier error. Think of it this way: when you are in the lift and it accelerates upwards, you feel heavier right? This is because the upwards acceleration of the lift causes an additional force to be applied to your feet, increasing your apparent weight. This is why when calculating the force due to weight acting on the lift and the painter, it is appropriate to factor in the total acceleration of the system. The diagram consists of two separate free body diagrams, one for the painter and one for the lift. Though the normal contact force acts on the lift from the bottom of the painter's feet, it is drawn at the top for clarity's sake. Feel free to clarify. There is more than 1 method to do this question and this certainly not the best, but this is one way to look at it.