"Mechanical Energy and Its Transformation" Work and Mechanical Energy PPT Teaching Courseware

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"Mechanical Energy and Its Transformation" Work and Mechanical Energy PPT Teaching Courseware

The first part of the content: Practice on classification of knowledge points

Knowledge point 1 Mechanical energy and its transformation

1. Kinetic energy and potential energy are collectively called _____ energy. An object falling from a height has a kinetic energy of 8 J and a gravitational potential energy of 6 J at a certain position. Then the mechanical energy of the object is ____J.

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

A. An object only has kinetic energy, it cannot be said to have mechanical energy

B． An object only has gravitational potential energy and cannot be said to have mechanical energy.

C． An object only has elastic potential energy and cannot be said to have mechanical energy.

D． The above statements are all wrong

3. As shown in Figure 11-4-1, during the motion of the rolling pendulum, the correct description of the change in mechanical energy is ()

A. The kinetic energy of the rolling pendulum is converted into gravitational potential energy during the fall process.

B． The gravitational potential energy is converted into kinetic energy during the falling process of the rolling pendulum.

C． The kinetic energy of the rolling pendulum is maximum at the highest point and the gravitational potential energy is minimum.

D． The kinetic energy of the rolling pendulum continues to increase during the fall, but the gravitational potential energy remains unchanged.

4． Among the four examples shown in Figure 11-4-2, the mechanical energy is decreasing ( )

Knowledge point 2 Conservation of mechanical energy

5. As shown in Figure 11-4-3 is a simple pendulum. Pull the ball to point A and let go. You can observe that the swing amplitude of the ball will gradually decrease during the swing, and finally stop. When the ball starts swinging from point A to point B, _______ energy is converted into _____ energy; during the process of swinging from point A to point C, the mechanical energy _____ (optional "increase", "unchanged" or " Decrease"); if friction and air resistance are not taken into account, the height of the ball when it reaches point C is equal to point A, indicating that the mechanical energy of the ball is _____ (optional "conservation" or "non-conservation").

6． The "Long March 3B" carrier rocket carrying the "Chang'e 3" was launched from the Xichang Satellite Launch Center and accurately entered orbit. The launch was a complete success. As shown in Figure 11-4-4, "Chang'e-3" is in the process of accelerating its ascent ( )

A. Kinetic energy increases, gravitational potential energy decreases, and mechanical energy remains unchanged.

B． Kinetic energy decreases, gravitational potential energy increases, and mechanical energy remains unchanged.

C． Kinetic energy remains unchanged, gravitational potential energy decreases, and mechanical energy decreases

D． Kinetic energy increases, gravitational potential energy increases, and mechanical energy increases

7. As shown in Figure 11-4-5, hang an iron lock with a rope. Pull the iron lock close to your nose, and release your hand after it stabilizes. Keeping the head still, the lock swings forward and back. Which of the following statements is correct ( )

A. During the swing of the iron lock, the mechanical energy remains unchanged.

B． When the iron lock swings to the lowest point, the kinetic energy is the smallest

C． During the descent of the iron lock, the potential energy of gravity is converted into kinetic energy

D． As the iron lock rises, the potential energy of gravity is converted into kinetic energy.

8. Our country is one of the countries with the richest water resources in the world. Among the following statements about water energy, which one is incorrect ( )

A. The poem "The Yangtze River never stops rolling" describes the kinetic energy of the water in the Yangtze River.

B． The poem "The water of the Yellow River comes from the sky" describes the gravitational potential energy of the Yellow River water.

C． During hydroelectric power generation, river dams are built to prevent the flow of water from being too strong and damaging the generator set.

D． When using water energy to generate electricity, the water rushing down from the upstream has both kinetic energy and gravitational potential energy.

Mechanical energy and its transformation PPT, the second part of the content: Comprehensive training of regular methods

9. Mao Zedong's "Qinyuan Chun·Snow" is majestic. There is a line in it that says: "The genius of the generation, Genghis Khan, only knows how to bend his bow and shoot at big eagles." From the perspective of energy conversion, the process of bending a bow and shooting an arrow is ( )

A. The process of converting kinetic energy into gravitational potential energy

B． The process of converting elastic potential energy into kinetic energy

C． The process of converting gravitational potential energy into kinetic energy

D． The process of converting kinetic energy into elastic potential energy

10．2017·Hangzhou As shown in Figure 11-4-6, when the wooden block slides down from the top along the inclined plane at a constant speed, the ()

A. Gravitational potential energy decreases and kinetic energy increases

B． Gravitational potential energy decreases and mechanical energy decreases

C． Kinetic energy remains unchanged, mechanical energy remains unchanged

D． Gravitational potential energy remains unchanged and mechanical energy decreases

11． As shown in Figure 11-4-7, the steel ball moves from point a to point d along the smooth track abcd in the vertical plane. The steel ball ( )

A. The speed when passing through point d is greater than that when passing through point c

B． The gravitational potential energy at point c is smaller than that at point b

C． In the process of moving from a to b, kinetic energy is converted into gravitational potential energy

D． During the movement from b to c, mechanical energy is converted into gravitational potential energy

12． As shown in Figure 11-4-8, the track ABC is smooth, and the spring is fixed at the end of the horizontal track. The ball rolls down from rest at point A, hits the spring, and reaches the maximum compression of the spring. In this process, the mechanical energy conversion is: ( )

A. Gravitational potential energy → kinetic energy

B． Gravitational potential energy → kinetic energy → elastic potential energy

C． Gravitational potential energy → kinetic energy → elastic potential energy → kinetic energy → gravitational potential energy

D． The mechanical energy of the ball continues to decrease

13． Figure 11-4-9 shows the orbit diagram of the artificial earth satellite. Satellites operate outside the atmosphere and are not subject to air resistance. They can be regarded as only the conversion of kinetic energy and potential energy, so mechanical energy _____. When the satellite is at apogee, its _____ (optional "kinetic energy" or "potential energy", the same below) is maximum; when it moves from apogee to perigee, its potential energy decreases, _____ increases, and its speed also increases.

Mechanical energy and its transformation PPT, the third part: practical practice of high-frequency examination questions

15．2018·Fujian On May 5, 2018, China’s domestic aircraft carrier completed the first takeoff and landing of a carrier-based helicopter. The helicopter decelerates and descends close to the aircraft carrier deck ( )

A. Inertia increases

B． Kinetic energy becomes smaller

C． Gravitational potential energy remains unchanged

D． Mechanical energy remains unchanged

16．2018·Suzhou A small ring with mass m is threaded on a fixed smooth curved rod. It is released from a stationary point A and then moves along the curved rod, as shown in Figure 11-4-11. Disregarding air resistance, which of the following statements is correct ( )

A. As long as point A is higher than point D, the small loop can reach point D.

B． If the small ring can reach point D, it will move vertically downward after leaving point D.

C． From point A to point D, the gravitational potential energy of the small ring decreases and the mechanical energy remains unchanged.

D． From point A to point B, the kinetic energy of the small ring keeps increasing, but the mechanical energy remains unchanged.

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Update Time: 2024-11-09

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