We typically use the ax ‘weight’ i m sorry is in reality the ‘mass’. Plenty of things are measured in regards to ‘mass’ in the commercial world.

Measuring Mass

We typically use the ax ‘weight’ which is actuallythe ‘mass’. Many things are measured in terms of ‘mass’ in the advertising world.The SI unit of fixed is kilogram. In any case, the devices are based on the itemspurchased. For example, us buy yellow in gram or milligram, drugs inmilligram, provisions in gram and kilogram and express cargo in tonnes.

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Can we use the same instrument for measuring theabove noted items? different measuring gadgets have come be offered for items ofsmaller and larger masses. In this section we will study about some of theinstruments provided for measure up mass.

## Common (beam) balance

A beam balance compares the sample mass with astandard reference mass. (Standard reference masses space 5g, 10g, 20g, 50g,100g, 200g, 500g, 1kg, 2kg, 5kg). Is balance have the right to measure mass accurately up to5g (Figure 11).

## Two pan balance

This type of balance is commonly used in provisionand grocery shops (Figure 12). Is balance compare the sample mass through thestandard recommendation mass. The pans rest on height of the beam and also can beconveniently inserted on a table top. Is balance deserve to measure fixed accurately upto5 g.

## Physical balance

This balance is offered in labs and is similar to thebeam balance but it is a lot an ext sensitive and can measure up mass of one objectcorrect come a milligram (Figure 13).

The standard reference masses provided in this physicalbalance room 10 mg, 20 mg, 50 mg, 100 mg, 200 mg, 500 mg, 1 g, 2g, 5 g, 10 g, 20g, 50 g, 100g, and 200 g.

## Digital balance

Nowadays because that accurate measurements digital balancesare used, which measures mass accurately also up to a few milligrams, the leastvalue gift 10 mg (Figure 14). Is electrical device is simple to handle andcommonly offered in jewellery shops and labs.

## Spring balance

This balance helps united state to uncover the weight of an object.It is composed of a spring resolved at one end and a hook attached come a rod in ~ theother end. It functions by ‘Hooke’s law’ which explains that the enhancement of weightproduces a proportional boost in the length of the feather (Figure 15). Apointer is attached come the rod i beg your pardon slides over a graduated scale on theright. The feather extends according to the load attached come the hook and thepointer reads the weight of the thing on the scale.

Solve – Themass that 40 to apologize in a crate is 10 kg.(i) find the massive of a dozen of castle (ii) refer the massive of one apple ingram.

## 1. Difference in between massand weight

Mass (m) is the amount of matter consisted of in abody. Weight (w) is the normal force (N) exerted through the surface ar on the human body tobalance against gravitational traction on the object. In the instance of spring scalethe tension in the spring balances the gravitational pull on the object. Whenthe male is standing on the surface of the earth or floor, the surface ar exerts anormal pressure on the body which is identical to gravitational force. Thegravitational force acting ~ above the object is offered by ‘mg’. Here m is mass ofthe object and ‘g’ is acceleration as result of gravity.

If a man has actually a fixed 50 kg top top the earth, then whatis his weight?

Weight(w) = mg

Mass the aman = 50 kg

Hisweight = 50 × 9.8

w = 490newton

The pull of gravity on the Moon is 1/6 time weakerthan the on the Earth. Is reasons the load of the thing on the Moon to beless 보다 that on the Earth.

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Acceleration as result of gravity top top the Moon = 1.63m/s2

If the fixed of a man is 70 kg then his load onthe planet is 686 N and also on the Moon is 114 N. Yet his massive is tho 70 kg ~ above theMoon.