"Mechanical Energy and Its Transformation into Potential Energy" PPT

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"Potential Energy" Mechanical Energy and Its Transformation PPT Courseware 3

The property management office of a certain community posted the following notice: If a 70-gram egg is dropped from the 4th floor and hits a pedestrian on the ground, it will cause swelling on the head. If it is dropped from the 8th floor, it will cause a ruptured scalp. If thrown from the building, the skull of a pedestrian can be broken, and if thrown from the 25th floor, the person will die on the spot...

Why do falling eggs have so much power?

Discussion: Do the following objects have energy? Divide the test into two categories and state the basis for classification.

1. The bent springboard

2. Chandeliers on the ceiling

3. A bent bow

4. A tight spring

5. The heavy hammer being lifted high

1. Potential energy

1. Gravitational potential energy: The energy an object has due to being lifted high is called gravitational potential energy.

2. Elastic potential energy: The energy an object possesses due to elastic deformation is called elastic potential energy.

3. Gravitational potential energy and elastic potential energy are collectively called potential energy.

What form of energy do the following objects have:

(1) Cars traveling horizontally:___________

(2) A car climbing a hill: ___________

(3) Stone on the top of the mountain:___________

(4) Stones rolling down from the top of the mountain:___________

(5) Chandelier on the ceiling: ___________

(6) Chandelier swinging on the ceiling:___________

(7) Stretched rubber band: ___________

(8) Falling raindrops:___________

2. Explore what factors are related to the magnitude of gravitational potential energy?

guess:

1. The magnitude of gravitational potential energy is related to the height at which the object is lifted.

2. The magnitude of gravitational potential energy is related to the mass of the object

Design experimental plan:

1. The method of judging the magnitude of gravitational potential energy is___________.

2. The experimental method used is___________;

Your inquiry steps are___________;

4. Use your hands and brain to learn physics

1. An airplane flies horizontally and at a constant speed over the disaster area and continuously drops relief supplies to the disaster area. During this process, the airplane has kinetic energy _____ and potential energy ______. (fill in "get bigger" or "get smaller")

2. Regarding the concept of energy, which of the following statements is correct ( )

A. The gravitational potential energy of an object lifted high must be large.

B. Since the hanging object does no work, it has no energy

C. Bullets flying in the air have the ability to do work, so they have the ability to

D. If an object has mechanical energy, then the object must have both kinetic energy and potential energy.

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Update Time: 2024-11-22

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