PASCO Specialty & Mfg. ME-8569 User Manual download pdf (Page 11)

scientific

012-04774A

Experiment #3: Bouyant Force

REQUIRED EQUIPMENT:

Density set

String (SE-8050)

Overflow can (SE-8568)

Beaker for catching water

Graduated cylinder (50 ml)

Triple-beam balance (SE-8708)

PURPOSE:

This experiment measures the buoyant force on an object in

water by using Archimedes’ Principle and by finding the

upward force on the object while it is submerged.

PROCEDURE

I. ARCHIMEDES’ PRINCIPLE

Archimedes’ Principle states that the buoyant force exerted

on an object partially or fully submerged in a fluid will be

equal to the weight of the fluid displaced by the object. To

use this principle to find the buoyant force exerted on each

object, follow these steps:

1. Find the mass of the empty beaker and record this at the

top of Table 3.1. Put the beaker under the overflow can

spout as shown in Figure 1.

MASS OF BEAKER =

Table 3.1: Measurements

OBJECT

MASS OF BEAKER +

WATER

MASS OF

WATER

WEIGHT OF DISPLACED

WATER

AL. CYLINDER

AL. BLOCK

BRASS CYL.

BRASS BLOCK

PLASTIC CYL.

AL. IRREG. SHAPE

BRASS CYL. 1/2

SUBMERGED

Figure 1: Overflow Setup

2. Pour water into the overflow can until it overflows into

the beaker. Allow the water to stop overflowing on its own

and empty the beaker into the sink and return it to its

position under the overflow can spout without jarring the

overflow can.

3. Tie a string to each of the objects.

4. Gently lower the first object into the overflow can until it

is completely submerged. Allow the water to stop overflow-

ing and then find the mass of the beaker with the water in it.

Record this mass in Table 3.1.

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PASCO Specialty & Mfg. ME-8569 User Manual Page 11

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