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"Mechanical Energy" Mechanical energy, internal energy and their transformation PPT courseware 4
Test you: What are the two necessary factors for doing work?
force acting on an object
An object travels a distance in the direction of the force
1. What is ability:
If an object can do work, we say that the object has energy.
2. Mechanical energy
1. Kinetic energy: The energy an object has due to motion.
Experimental results:
The greater the mass of the moving object, the faster the speed and the greater the kinetic energy.
2. Potential energy
(1) Gravitational potential energy: The energy of an object subject to gravity due to being lifted high.
What factors affect the magnitude of gravitational potential energy?
Experimental conclusion: The greater the mass and height of the object being lifted, the greater the gravitational potential energy.
practice
1. There are two objects with different masses at the same height. Which object has the greater gravitational potential energy? What methods can be used to make the gravitational potential energy of these two objects equal?
⑵Elastic potential energy: The energy of an object that undergoes elastic deformation
What factors affect the magnitude of elastic potential energy?
(Within a certain range of the same object, the greater the deformation of the object, the greater the elastic potential energy)
Mechanical energy = kinetic energy + potential energy (gravitational potential energy and elastic potential energy)
2. A toy ball is moving in the air. Its mechanical energy is 35J and its kinetic energy is 17J. What is the gravitational potential energy?
When an airplane flies at a constant speed at a certain height and sprays pesticides, the plane's ( )
A. The kinetic energy decreases and the gravitational potential energy decreases.
B. Kinetic energy remains unchanged and gravitational potential energy remains unchanged.
C. Kinetic energy decreases and gravitational potential energy increases
D. Kinetic energy increases and gravitational potential energy decreases.
Experimental proof
The kinetic energy and potential energy of an object can be converted into each other;
In the process of mutual conversion of only kinetic energy and potential energy, the total amount of energy remains unchanged.
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"Mechanical Energy" PPT (second lesson):
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"Mechanical Energy" PPT (first lesson):
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