Think and discuss • A system of two bodies A and B are placed as shown in figure. How TIM many forces are acting on A and B respectively? • Why is it necessary to separate contact force into a normal force and frictional force? Give at least a two reasons.
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The normal force is one component of the contact force between two objects, acting perpendicular to their interface. Hence it is necessary to separate these two forces as they work in opposite direction in a same body and movement of a body depends on them.
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