"Why Ballpoint Pen Refills Can Retract" PPT Courseware 2

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"Why Ballpoint Pen Refills Can Retract" PPT Courseware 2

1. Experimental research and preliminary understanding

1. Observe carefully:

1. What happens when the spring is stressed?

2. What happens when the force-bearing spring is cancelled?

2. Experience it carefully: How do your hands feel?

Warm reminder: Pay attention to safety and don’t use too much force!

Experiment 2: Study other elastic objects

ruler sponge table tennis

balloon rubber band

2. Cooperate and communicate to form cognition

1. Let’s talk about it, what is elasticity?

When we pull and compress the springs, we feel their ( ) effect on the opponent. This force is ( ).

2. Let’s talk about it, what is elasticity?

When we compress or pull the spring, under the action of force, their ( ) will change. After the force is removed, the object will return to ( ). This characteristic is called ( ).

3. Think about it: What other objects in life have characteristics similar to springs?

Rubber bands, balloons, sponges, rulers, basketballs, rubber balls, footballs, tennis balls, spring scales, etc.

3. Discuss and summarize, summarize the principles

Small discussion: Why can ballpoint pen refills expand and contract?

Answer: The elasticity of the spring in the ballpoint pen allows the pen core to expand and contract easily. When you press the pen core, the spring becomes shorter and elastic force is generated, and the pen core extends out; when you release your hand, the spring becomes longer, and the elastic force makes the pen core retract. Combined with other devices, The refill can be easily retracted.

4. Connect with reality and consolidate knowledge

Let’s talk about it: Where in production and life are the elasticity of objects used?

5. Expand application and internalize knowledge

after class homework

After studying this lesson, can you use the elasticity of objects to make a small production or invention?

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"Why Ballpoint Pen Refills Can Retract" PPT Courseware 3:

"Why can ballpoint pen refills expand and contract" PPT courseware 3 Warm tips 1. What are the characteristics of springs that enable pen refills to expand and contract easily? 2. What happens when the spring is pulled, pressed, or pressed? Carefully experience how it feels on your hands? What happens after you loosen it?

"Why Ballpoint Pen Refills Can Retract" PPT courseware:

"Why Ballpoint Pen Refills Can Retract" PPT Courseware Experiment 1: Observe carefully: What happens to the spring? Experience it carefully: How do your hands feel? Characteristics of the spring: When pulled by hand, the spring will ( ) after being stressed. Release your hand and remove the force, the spring will (..

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Update Time: 2024-11-17

This template belongs to science courseware Fourth-grade science volume 2 of the E-education edition industry PPT template

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