MEASUREMENT - QUANTITIES, UNITS, DENSITY, FORCE - GR 8 by Lizelle Swanepoel

DENSITY LAB PRAC - VIDEO

lizellexs — 2021-07-29 20:49:58 UTC

ARCHIMEDES’S EUREKA MOMENT WITH A GOLD CROWN USING THE DISPLACEMENT METHOD

lizellexs — 2021-07-29 20:56:31 UTC

DENSITY DEFINITION

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Density = An object’s mass per unit volume.

EXPLAIN THESE LAYERS IN TERMS OF DENSITY

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DENSITY EXPLAINED

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MASS VS DENSITY

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VOLUME & MASS DETERMINE DENSITY

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CONVERSION PROBLEMS (GENERAL)

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Perform the following conversions.
The International System of Units is used:
1. 2,5 m = __________ cm
2. 18 mL = __________ L
3. 68 kJ = __________ J
4. 6 500 mg = __________ kg
5. 101 kPa = __________ Pa
6. 325 ms = __________ s
7. 4,5 m³= __________ dm³

EXERCISE 1

lizellexs — 2021-08-02 19:23:22 UTC

Do these eight problems from the class notes:
1.
What is the density of coal if 15 cm³ of it has a mass of 27 g?

2.
Calculate the mass of 25 cm³of mercury, if it has a density of 13,6 g.cm^-3.

3.
What is the volume of gold in a crown if it has a mass of 2 kg? Gold has a density of 19,3 g/cm³.

4.
What mass of air is in a room if its density is 1,26 kg/m³ and the dimensions of the room are 10 m by 12 m and it has a height of 4 m?

5.
A rock of mass 86 g is lowered into some water in a measuring cylinder. The level of the water rose from 40 cm³to 78 cm³. What was the density of the rock?

6.
A rectangular block of copper has a density of 8,94 g.cm^-3 and a mass 112 g. What is the length of the block if it has height 0,9 cm and breadth 2,8 cm?

7.
A neutron star consists of matter with a density of about 5 x 10¹⁴ g.cm^-3. If a teaspoon of it is 5 cm³, what would be the mass of a teaspoon of matter from a neutron star?

8.
A 6,0 m rectangular rod has the same breadth and width. If it was made of iron (density 7,8 g.cm^-3) and had a mass of 14 kg, what was its breadth and width?

MASS

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DISTANCE

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VOLUME

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MEASURING MASS - Triple Beam balance

lizellexs — 2023-05-22 11:27:36 UTC

Measures the mass of various objects. It consists of three beams, each of which is provided with a single sliding weight that has a size corresponding to the gradations of the notched scale on each beam.

Reading volumes off of glassware

lizellexs — 2023-05-22 11:31:49 UTC

https://youtu.be/wWWV9DeW1Qg

CAN YOU DO THE FOLLOWING VOLUME READINGS?

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Doing a triple beam balance reading

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What is this triple beam balance reading?

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STEP 4: DO READING FROM 100s to 10s to digits

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What is this reading?

STEP 3: LOAD PAN, SLIDE COUNTERWEIGHTS TILL POINTER ON ZERO

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STEP 2: SLIDE ALL COUNTERWEIGHTS TO ZERO

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STEP 1: TARE POINTER ON ZERO

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HOW TO LOAD A THREE BEAM BALANCE AND DO MASS READING

lizellexs — 2023-05-23 07:52:05 UTC

Worksheet & Answers

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lizellexs — 2023-05-23 12:51:53 UTC

EXERCISE 2

lizellexs — 2023-07-24 11:43:49 UTC

RELATIVE DENSITIES

lizellexs — 2023-07-25 12:21:52 UTC

If the object's density is less than the density of water (e.g., 0.5 g/cm³), it will float on the water's surface because the water exerts an upward force (buoyancy) on the object, which is greater than the force of gravity pulling it downward.
The object displaces a volume of water equal to its own weight, and it stays afloat.
If the object's density is equal to the density of water (1 g/cm³), it will hang suspended halfway in the water. This is because the buoyant force is equal to its weight.
If the object's density is greater than the density of water, it will sink, and the depth of sinking will depend on the difference in densities because the gravitational force pulling it down is stronger than the buoyant force pushing it up.
The depth to which the object sinks will depend on the difference in densities between the object and the water.
Heavier objects will sink deeper.

NOTES

lizellexs — 2025-04-16 08:24:18 UTC

Hydrogen explosions

lizellexs — 2025-05-13 07:58:23 UTC