"Quality" Quality and Density PPT Courseware 3

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"Quality" Quality and Density PPT Courseware 3

Please classify the nails, matchsticks, iron blocks, copper wires, wood blocks, copper cylinders, etc. on the table; how can they be classified? Please give reasons for classification.

All objects are made of matter.

Compare

Which one uses more rubber, car tires or bicycle tires?

Car tires use a lot of rubber

What conclusion can you draw from the above?

The amount of matter that makes up an object varies. In physics, the amount of matter contained in an object is called the mass of the object.

1. Mass (m): the amount of matter contained in an object

1. International unit: kilogram (kg)

2. Commonly used mass units: tons (t), grams (g), milligrams (mg)

3.Unit conversion:

1t =____ kg 1kg =____ g 1g =____mg

2. Tools commonly used in laboratories to measure quality:

(one). The structure of the pallet balance

(two). How to use a pallet balance

1) Place: Place the balance on a horizontal platform (lay it flat)

2) Dial: Move the cursor to the zero mark on the left end of the beam ruler. (reset to zero)

3) Adjustment: Adjust the balance nut on the beam so that the pointer points to the center line of the indexing plate (or the pointer swings to the left and right of the center line with equal amplitude), then the beam is balanced. When the pointer moves to the left, the balance nut should be adjusted to the right (left to the right, right to the left).

4) Measurement: Place the object to be measured in the left disk. Use tweezers to add or subtract weights to the right pan and move the balance to balance the balance. (Code things from the left to the right, big first and then small)

5) Reading: The total mass of the weights in the right disk plus the corresponding scale value of the free weight on the scale is equal to the mass of the object in the left disk.

(3) Things to note

(1) Each balance has its own maximum weighing and sensing capacity, which is the maximum and minimum mass of the object it weighs. Exceeding the maximum weighing capacity will damage the balance, while weighing less than the sensing capacity will result in the measured mass being incorrect. Accurate and cannot be measured directly.

(2) After the balance is balanced, the left and right pallets cannot be swapped; if the position of the balance changes, readjust the balance; when weighing the mass of an object, the balance nut cannot be moved.

(3) Wet objects and chemicals cannot be placed directly into the balance plate.

(4) Use tweezers when adding or subtracting weights to the plate or moving the weights. Do not touch the weights directly with your hands, and do not get the weights wet or dirty.

(5) Estimate first and add weights from large to small until the smallest weight is overweight, then use moving weights instead.

practice

1. The mass of a steel rod will change under the following circumstances: ( )

A. Heat the steel rod to 1000C

B. Roll the steel rod into a thin steel plate

C. Astronauts brought steel to the moon

D. Use a file to process the steel rod

2. Melt all 10 kilograms of ice into water, the mass is ______, (fill in "get bigger", "get smaller" or "unchange"), and bring this water to the moon, its mass is ________ kilograms.

Measuring the mass of a liquid:

(1) Adjust the balance of the scale;

(2) Measure the mass m0 of the empty beaker;

(3) Pour the liquid to be measured into the beaker and measure the total mass mtotal;

(4) The mass of the liquid being measured is m=mtotal − m0.

Summary of usage of pallet balance

1) Place: Place the balance on a horizontal platform (lay it flat)

2) Dial: Move the cursor to the zero mark on the left end of the beam ruler. (reset to zero)

3) Adjustment: Adjust the balance nut to balance the beam of the balance. (Left to right, right to left).

4) Measure: weigh the object on the left and the right. When adding weights, use tweezers to make the weight larger first and then smaller, and move the weight to balance the beam.

5) Reading: The total mass of the weights in the right disk plus the corresponding scale value of the free weight on the scale is equal to the mass of the object in the left disk.

6) Adjustment: After weighing, use tweezers to put the weights back into the weight box one by one, and move the weight back to the zero line.

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Update Time: 2024-07-30

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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