Answer :
The magnitude of the normal force acting on the child is 645 N.
What is the magnitude of the normal force acting on the child when the scale reads 645 N?
The magnitude of the normal force acting on the child is equal to the reading on the scale, which is 645 N.
When the child steps onto the scale, the scale measures the force exerted by the child's weight. According to Newton's third law of motion, the force exerted by the child on the scale is equal in magnitude and opposite in direction to the normal force exerted by the scale on the child. In this case, the scale reading of 645 N represents the magnitude of the normal force, which is equal to the child's weight.
The normal force is a contact force exerted by a surface to support the weight of an object resting on it. In this scenario, the normal force from the scale balances the downward force of gravity acting on the child, resulting in a stable equilibrium. The magnitude of the normal force is determined by the weight of the child, which in this case is 645 N.
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