To measure weight, use any type of scales with a sufficient class of accuracy. The second option of determination of weight – from interaction with a body which mass is known. To find the weight of motionless or evenly moving body, increase weight by acceleration of gravity (9.81 m/s²). If the body moves with acceleration, then depending on the nature of the movement, it is necessary either to take away it, or to add to acceleration of gravity.
It is required to you
- scales, carts for interaction definition, the accelerometer, a roulette, a dynamometer.
Instruction
1. Measurement of weight by means of a vesovchtoba to measure body weight on electronic or spring scales, just put it on the special platform and on a device scale, or its screen the value will appear. If to perform measurement on lever scales, counterbalance them, then on one cup establish a body, and on another – a set of cargoes of the known weight, adding them until scales are not counterbalanced. Put the mass of cargoes, it also will be required body weight.
2. Measurement of weight by means of interaction of two bodies Take two identical carts of the known weight. Put them nearby, on one of them having shipped a body which mass is measured. Between them place an elastic strip from steel, previously having bent it, and release. A strip, having worked with an identical force on carts, will set them in motion. Measure the distance passed by carts a roulette. For obtaining mass of cargo do the following calculations: 1. Increase distance which there passed the empty cart by its weight.2. Divide result into the distance passed by the loaded cart.3. From the received value take away the mass of the empty cart.
3. Determination of weight to a telapodvesta a body on a dynamometer, it will show the gravity which affects it. It will also be body weight in newtons. If the body moves evenly and rectilinearly, indications of a dynamometer will not change. When body weight is known, at rest find body weight, having increased it by number 9.81 (acceleration of gravity).
4. When the body moves with acceleration up, measure it by means of the accelerometer or any other way. To receive body weight, increase its weight by the sum of acceleration of gravity and acceleration with which the body moves. Body weight will increase in comparison with a condition of rest. If the body moves with acceleration down, then take away value of acceleration from acceleration of gravity. Body weight will decrease. It is possible to test zero gravity, moving down, with acceleration of 9.81 m/s².