"Potential Energy" Mechanical Energy and Its Transformation PPT Courseware

Description

"Potential Energy" Mechanical Energy and Its Transformation PPT Courseware

learning target

(1) Know the concept of potential energy;

(2) Grasp the influencing factors of potential energy.

1. The concept of potential energy

The energy possessed by objects at high altitudes is called gravitational potential energy.

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

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

2. The magnitude of gravitational potential energy

What factors are related to the magnitude of gravitational potential energy?

Observation and Experimentation

1. As shown in the picture, let the same object fall from different heights, hit the small table, and observe the depth of the table legs sinking into the sand.

2. Change a few more heights and repeat the above operations.

3. Record the experimental results

Analyzing the above experimental results, what did you find?

The experimental results show that the gravitational potential energy of an object is related to its mass and the height to which it is lifted. For objects with the same height, the greater their mass, the greater their gravitational potential energy; for objects with the same mass, the higher their height, the greater their gravitational potential energy.

Experiments show that the greater the elastic deformation of an object, the greater its elastic potential energy.

Summary of this lesson

What did you gain from studying this class?

1. Gravitational potential energy

(1) Concept

Gravitational potential energy: The energy an object has due to its height position

(2) Factors affecting size

The higher an object is lifted and the more massive it is, the more gravitational potential energy it has.

2. Elastic potential energy

(1) Concept

Elastic potential energy: the energy of an object due to elastic deformation

(2) Factors affecting size

The greater the elastic deformation of an object, the greater its elastic potential energy.

Practice in class

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

A. Objects with equal potential energy must be at the same height

B. Since the hanging object does no work, it cannot

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.

2. When 5N and 2N weights are hung under the same spring, the elastic potential energy of the spring is ( )

A. Have the same elastic potential energy twice

B. The elastic potential energy of the first time is greater than that of the second time.

C. The elastic potential energy of the first time is smaller than that of the second time.

D. Unable to determine their size relationship

3. There is a tamping machine that lifts the heavy hammer to a high place and then releases it when working. When the heavy hammer hits the ground, it will tamp the soft ground. Please talk about ways to increase the gravitational potential energy of the weight.

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Update Time: 2024-10-31

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