We generally use the ax ‘weight’ i beg your pardon is in reality the ‘mass’. Numerous things room measured in terms of ‘mass’ in the commercial world.

Measuring Mass

We commonly use the ax ‘weight’ which is actuallythe ‘mass’. Many things room measured in terms of ‘mass’ in the advertisement world.The SI unit of fixed is kilogram. In any case, the units are based on the itemspurchased. For example, us buy gold in gram or milligram, medicines inmilligram, provisions in gram and also kilogram and express cargo in tonnes.

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Can we usage the same instrument for measuring theabove detailed items? various measuring devices have come be supplied for items ofsmaller and also larger masses. In this section we will certainly study around some the theinstruments provided for measure mass.

## Common (beam) balance

A beam balance to compare the sample mass v astandard reference mass. (Standard reference masses are 5g, 10g, 20g, 50g,100g, 200g, 500g, 1kg, 2kg, 5kg). Is balance deserve to measure massive accurately up to5g (Figure 11).

## Two pan balance

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

## Physical balance

This balance is provided in labs and is comparable to thebeam balance yet it is a lot an ext sensitive and also can measure up mass of one objectcorrect to a milligram (Figure 13).

The standard recommendation masses supplied in this physicalbalance space 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 for accurate dimensions digital balancesare used, which steps mass accurately even up to a few milligrams, the leastvalue gift 10 mg (Figure 14). Is electrical maker is simple to take care of andcommonly used in jewellery shops and also labs.

## Spring balance

This balance helps us to discover the load of an object.It is composed of a spring addressed at one end and a hook attached to a rod at theother end. It works by ‘Hooke’s law’ which explains that the addition of weightproduces a proportional rise in the size of the spring (Figure 15). Apointer is attached to the rod i m sorry slides end a graduated range on theright. The spring extends follow to the weight attached to the hook and thepointer reads the weight of the object on the scale.

Solve – Themass that 40 to apologize in a box is 10 kg.(i) uncover the fixed of a dozen of lock (ii) to express the mass of one apple ingram.

## 1. Difference in between massand weight

Mass (m) is the quantity of matter included in abody. Weight (w) is the normal force (N) exerted through the surface on the body tobalance against gravitational pull on the object. In the situation of spring scalethe anxiety in the spring balances the gravitational traction on the object. Whenthe man is was standing on the surface of the earth or floor, the surface exerts anormal pressure on the body which is identical to gravitational force. Thegravitational force acting ~ above the thing is given by ‘mg’. Here m is fixed ofthe object and also ‘g’ is acceleration as result of gravity.

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

Weight(w) = mg

Mass that aman = 50 kg

Hisweight = 50 × 9.8

w = 490newton

The traction of heaviness on the Moon is 1/6 time weakerthan the on the Earth. Is causes the load of the thing on the Moon to beless 보다 that top top the Earth.

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Acceleration due to gravity ~ above the Moon = 1.63m/s2

If the fixed of a male is 70 kg climate his load onthe earth is 686 N and on the Moon is 114 N. Yet his mass is tho 70 kg top top theMoon.