why do u have to stand streight on weighing scale to get correct weight? why does the weight change if u bend?

Question

I would like to know the physics behind it.

Answer 1

It is not very difficult to find a weighing scale.



Finding a scale, first find your weight by standing straight; then stand in what ever position you want; you can even sit down on the machine.



But wait till the needle comes to equilibrium position.



In all positions, you will find that the reading is the same.



The physics behind is that your weight acts on the machine as long as you are not toppled down the machine.



You might have seen lengthy rods are weighed using weighing machine which protrude beyond the platform of the machine; But care was taken that the rods do not touch the ground.



However you must stand straight while measuring height.



Since usually we measure both height and weight , there is a wrong notion that while neasuring weight one must stand straight.

Answer 2

Weighing scales measure the downward pressure when you stand on the scales as compared to when you are not on the scales. If constant, atmospheric pressure can be disregarded as it is present at both events. However, as atmospheric pressure changes with the weather this change does need to be considered. When atmospheric pressure is higher, our bodies will be more bouyant in the atmosphere and hence the downward pressure when we stand on the scales will be less. The difference for an average person is in the region of 6 grams.

Answer 3

Your weight does not change when you bend, but in the act of bending, your muscles contract to keep you in that position. This varying contraction creates a varying force on the scale, which does not cause a directional skew in the measurement, but rather provides less accurate results.

Answer 4

You don't have to stand up straight, you just have to be motionless.



The weight changes when you bend because you are moving your body around, which jiggles the scale.

Answer 5

The scale only measures accurately if your weight is centered.



I can only guess the physics - If your weight is off-center, some of the force is transferred to the scale's frame without passing through the measuring mechanism.

Answer 6

I dont think your weight will change just because you are bent.

Answer 7

I think it's because you're center of mass is being thrown off.

Answer 8

Weight is the measurement of how much gravity is pushing down on an object, if you bend over more gravity is pushing down on you.

Answer 9

because if you bend down all your weight will go with you and you will end up wieghing more