Question

A student stands with both feet on some scales in order to measure his weight. The reading on the scales is 500 N. He lifts one foot off the scales and keeps it lifted. What is the new reading on the scales?


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Answer 1

Explanation:

The scale reads your weight, not the pressure your feet apply. When you lift one foot up, it exerts more pressure, but the scale feels the same force. Both feet down, there is a larger surface area reducing the pressure on the scale, but with one foot up the the surface area is reduced and so the pressure goes up, but in both case the force on the scale is the same. The weight will be the same, the pressure will be different.

Hence, the reading does not change because the scale reads force and not pressure

Answer 2

Answer:

500 N

Explanation:

This is because your weight stays the same because of your gravitational pull to the earth only he pressure chages