"Exercise in this Chapter" Work and Mechanical Energy PPT

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"Exercise in this Chapter" Work and Mechanical Energy PPT

1. (Neijiang High School Entrance Examination) As shown in the picture, there are four solid balls of the same volume A, B, C, and D on the shelf. A and B are shot balls, and C and D are iron balls. Then the two balls A and B are In comparison, ball A has greater gravitational potential energy; compared with balls B and C, ball B has greater work ability (ρ lead > ρ iron).

2. (Liangshan Prefecture High School Entrance Examination) An object weighing 20 N can move at a uniform speed of 50 cm/s when acted on by a horizontal pulling force on a level ground. If the object moves 5 m and the power of the pulling force is 3 W, then The work done by pulling force is 30 J, and the work done by gravity is 0 J.

3. (Jining High School Entrance Examination) As shown in the picture, in order to obtain sufficient space residence time, divers will press down on the springboard before diving, so that they can use the elastic potential energy of the springboard to make themselves rise higher. Ignoring air resistance, during the process from leaving the springboard to entering the water, the athlete's kinetic energy is maximum when entering the water (optional "leaving the springboard", "highest point" or "entering the water").

4. (Zigong High School Entrance Examination) As shown in the figure, an object moved 10 m at a constant speed on the horizontal ground at a speed of 3 m/s under the action of a horizontal pull force F1 to the right. The work done by the pull force F1 is W1, and the power is P1; If the object moves at a constant speed of 10 m on the same horizontal ground at a speed of 2 m/s under the action of a horizontal rightward pulling force F2, the work done by the pulling force F2 is W2 and the power is P2, then W1=W2, P1>P2 (please fill in ">", "<" or "=").

5. (Zhuzhou High School Entrance Examination) In a basketball game, the process in which athletes do no work on the basketball is (C)

A. Dribbling B. Dunk

C. Wipe the board D. Jump shot

6. (Tianjin High School Entrance Examination) Chinese athlete Zhang Xiangxiang won the men's 62 kg weightlifting championship at the Olympics. His clean and jerk score was 176 kg. This is a photo of him during the competition. The work he does on the barbell during the clean and jerk process is closest to (D)

A.600 J B.1200 J

C.1800 J D.3400 J

7. (Yulin High School Entrance Examination) The 2018 World Cup is being held in Russia. As shown in the figure, the football is accelerating its decline. During this process, the following analysis of the changes in its mechanical energy is correct (A)

A. Kinetic energy increases and gravitational potential energy decreases

B. Kinetic energy decreases and gravitational potential energy increases

C. Kinetic energy increases and gravitational potential energy increases

D. Kinetic energy decreases and gravitational potential energy decreases

8. (Meishan High School Entrance Examination) Xiao Li throws a volleyball vertically upward. After leaving his hand, the volleyball moves vertically upward to a certain height and then falls back to the ground. Regardless of air resistance, the following statements are correct about the movement of the volleyball after it leaves his hand. is (D)

A. When the volleyball rises, Xiao Li does work on the volleyball.

B. The kinetic energy of the volleyball decreases as it falls.

C. When the volleyball rises, the volleyball receives a vertical upward force.

D. As the volleyball falls, the force of gravity on the volleyball becomes faster and faster.

9. (Mianyang High School Entrance Examination) Trampoline is an Olympic event. The athlete stands upright in the center of the trampoline before the start of the competition. At the beginning of the competition, the athlete squats down quickly and immediately returns to the upright position and is bounced by the trampoline. When leaving the trampoline, he remains in an upright position. After reaching the highest point, he drops down to contact the trampoline and then squats down quickly and immediately returns to the trampoline. Return to upright position. Get bounced off the trampoline again to reach a higher point. Ignoring air resistance, the following statement is correct (C)

A. Throughout the entire process, the athlete’s mechanical energy is conserved

B. Throughout the process, the athlete’s mechanical energy has been increasing

C. In the process from leaving the trampoline to falling onto the trampoline, the athlete's mechanical energy is conserved

D. In the process from falling onto the trampoline to leaving the trampoline, the athlete's mechanical energy is conserved

Keywords: Free download of PPT courseware for the second volume of eighth-grade physics published by People's Education Press, download of test PPT in this chapter, download of work and mechanical energy PPT, .PPT format;

For more information about the PPT courseware "Practice Gong and Mechanical Energy in the Examination in this Chapter", please click on the PPT tab of PPT Gong and Mechanical Energy in the Examination in this Chapter.

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Update Time: 2024-11-19

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