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A student has a schoolbag in his hand as shown in the picture. The weight of the schoolbag is 20 N. Determine the size, direction, and centre of gravity of the forces acting on the schoolbag and draw them to scale.
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There are two forces: weight and force of the arm. Both forces are equal to 20 N. The weight is directed vertically downwards and the force of the arm is in the opposite direction - vertically upwards. The weight is concentrated somewhere in the middle of the schoolbag and the force of the hand is concentrated in the middle of the palm. At the selected scale (5 N to 1 cm), the arrows representing both forces are 4 cm long.
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