"The Mass of Objects" Materials Around Us PPT Courseware 3

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"The Mass of Objects" Materials Around Us PPT Courseware 3

1. Quality of objects

1. Mass: The amount of matter contained in an object.

2. Mass is an attribute of an object. The size of mass has nothing to do with shape, state and position.

2. Unit of quality

1. International unit: kilogram (kg)

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

3.Conversion relationship:

1t=103kg, 1kg=103g, 1g=1000mg

1g=10-3kg, 1mg=10-6kg

3. How to use the balance: textbook page 113

Precautions:

(1) While measurement is in progress, the balance nut cannot be moved.

(2) When adding a small weight, it is too large. At this time, remove it and move the weight until the beam is balanced.

think about it

1. After a can is flattened, does it change its shape and quality?

2. In a spacecraft, objects are in a state of weightlessness. If an object on the ground is brought to the moon and into a spacecraft, will the mass of the object change?

3. When a piece of ice melts into water, does its mass change? (Evaporation is not considered)

Conclusion: Mass does not change with changes in shape, state and position.

4. Use chalk to write on the blackboard. When the length of the chalk becomes shorter, does the quality of the chalk change?

5. After the water in the pot boils, does the quality of the water in the pot change?

Conclusion: the mass becomes smaller

How to adjust and use the balance:

1. Place the balance on a horizontal table and use tweezers to move the scale to the "zero" scale line of the ruler.

2. Adjust the balance nut so that the pointer points to the central scale line of the index plate. At this time, the beam can be balanced in the "horizontal position".

3. Place the object to be measured in the left pallet, use tweezers to add or subtract weights to the right pallet and adjust the position of the cursor on the scale until the beam returns to balance.

m object = m weight + m swim

Here are the steps for weighing an object using a pallet balance

(A) Adjust the beam balance

(B) Place the balance on a horizontal table

(C) Move the game code to the zero mark position

(D) Place the object on the left disk

(E) Place weights or move the weights in the right disk until the beam is balanced

(F) Put the weight back into the weight box

(G) Record weighing results

The correct order should be

(B) (C) (A) (D) (E) (G) (F)

3. Place the pallet balance on the horizontal platform. The scale has moved to the "zero" scale line, but you find that the pointer is slightly to the right of the red line in the center of the index plate. The next operation is ( )

A Move the left balance nut to the right B Move the balancer to the right

C Move the balance nut to the left D Move the balancer to the left

4. When using an adjusted pallet balance to weigh the mass of an object, it is found that the pointer is slightly to the right of the red line in the center of the index plate, then the following operation should be performed ( )

A Add weight to the right plate B Move the game number to the right

C Turn the balance nut to the left D Move the slider to the left

Thoughts after class:

If the position of the object and the weight are reversed, how should the reading be taken?

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Update Time: 2024-10-19

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume one industry PPT template

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