"Why Ballpoint Pen Refills Can Retract" PPT Courseware

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"Why Ballpoint Pen Refills Can Retract" PPT Courseware

experiment one:

Observe carefully: What happens to the spring?

Experience it carefully: How do your hands feel?

Spring characteristics:

Pull by hand, the spring will ( ) after being stressed.

Release your hand and remove the force, the spring will ( ).

When you pull the spring with your hand, you feel a kind of ( ) in the spring against your hand.

Press with hand, the spring will ( ) after being stressed.

Release your hand and remove the force, the spring will ( ).

When you press the spring with your hand, you feel a kind of ( ) in the spring against your hand.

Please briefly explain: Why can ballpoint pen refills expand and contract?

Answer: Because there is () in the ballpoint pen, and the spring is (). When you press the pen tip, the spring changes to (), and at the same time () is produced, and the pen core stretches out; when you press it again, the spring changes to (), and at the same time ( ) is produced, and the pen The core is retracted and combined with other devices, the ballpoint pen core can be retracted freely.

Thinking: Where in production and life are the elasticity of objects used?

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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For more information about the PPT courseware "Why Ballpoint Pen Refills Can Retract", please click on the Why Can Ballpoint Pen Refills Retract PPT tab.

"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 2:

"Why Ballpoint Pen Refills Can Retract" PPT Courseware 2 1. Experimental exploration, preliminary understanding 1. Careful observation: 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...

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Update Time: 2024-09-30

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

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