"Seesaw" PPT

Description

Qingdao edition third grade science volume 2, seesaw PPT

Part One: Creating the Scenario

Observe children playing on the seesaw. What interesting questions can you find?

How to balance the seesaw on both sides?

Method 1: Move the distance between the people on both sides and the fulcrum.

Method 2: Change the weight on one side.

Question exploration

Condition: Lever is balanced (as shown in the picture)

1. Remove the same mass of hooks from both ends. Is the lever balanced?

2. Move the hooks at both ends to the fulcrum by the same distance. Is the lever balanced?

Seesaw PPT, part 2: balance and use

my discovery

When the length from the center of the lever ruler is the same and there are the same number of hooks on both sides, it can be balanced.

When there are the same number of hooks at both ends of the lever ruler, and the left and right sides are the same length from the center of the lever ruler, it can also be balanced.

What scale?

The balance is made based on the balancing principle of the lever ruler. The main structure includes a tray, a pointer plate, a balance wheel, a base, and accessory components such as weights and tweezers. A balance is an instrument for measuring the mass of objects.

How to use a balance correctly

1. Place the balance on the platform and place the scale at the zero mark on the left end of the ruler.

2. Adjust the balance nut on the right end of the beam so that the pointer points to the center line of the indexing plate. At this time, the beam is balanced.

3. Use tweezers to add and subtract weights while weighing objects on the left and right. The weight of the object being measured cannot exceed the maximum weighing capacity of the balance.

4. Read the total amount of weights in the right plate plus the scale value corresponding to the scale on the scale, which is equal to the mass of the object being measured. When reading the scale, the scale value on the left shall prevail.

Seesaw PPT, the third part: meeting the standards in class

Compliance in court

1. The finishing touch:

1. The balance is made based on the balance principle of ______.

2. A balance is an instrument for weighing ______ items. When weighing items, ______ puts the item being weighed and ______ puts the weight.

3. The main structure of the balance includes ______, ______, ______, ______ and accessory parts such as ______ and tweezers.

4. The length from the center of the lever ruler is the same, and the hooks on both sides are balanced when hung at ______; the left and right hooks of the lever ruler are hung at the same number, and the distance between them is ______.

5. Generally speaking, when a child and an adult play on a seesaw, the adult's sitting position is ______ farther from the center than the child's sitting position to maintain balance.

2. Petty Judge.

1. When taking the weights, you can hold them with your hands. ( )

2. The lever ruler can maintain balance only when the weights of the objects hanging on the left arm and the right arm of the lever ruler are equal. ( )

3. Tightrope walking and scale weighing all use the balancing principle of the lever ruler. ( )

Keywords: Qingdao version third grade science PPT courseware for the second volume free download, Seesaw PPT download, .PPT format;

For more information about the "Seesaw" PPT courseware, please click on the "Seesaw" ppt tab.

"Seesaw" PPT courseware:

Qingdao version of the second volume of third grade science, Seesaw PPT courseware, the first part of the content: Classroom experiments. Have you ever played similar games in our lives? Why does it fly up for a while and then fall down again? Explore ways to balance the seesaw. Please combine it with your own biology...

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Update Time: 2024-10-02

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