"Experiment: Verification of the Law of Conservation of Mechanical Energy" Law of Conservation of Mechanical Energy PPT courseware

"Experiment: Verification of the Law of Conservation of Mechanical Energy" Law of Conservation of Mechanical Energy PPT courseware

Part One: Learning Objectives

1. Verify the law of conservation of mechanical energy.

2. Be familiar with the measurement method of instantaneous speed.

3. Be able to perform experimental operations correctly, analyze experimental data to draw conclusions, and qualitatively analyze the causes of errors.

Law of Conservation of Mechanical Energy PPT, Part 2: Review Review

1. What is conservation of mechanical energy?

2. What are the conditions for conservation of mechanical energy?

3. Is the mechanical energy conserved for an object in free fall?

4. How to derive the expression for conservation of mechanical energy?

1. When choosing a heavy object, is it better to choose a lighter one or a heavier one? Why?

We require heavy objects to move freely, and resistance is inevitable. In order to reduce the impact of resistance on the experiment, heavier objects with higher density should be used.

2. What should you pay attention to when installing a dot timer?

Adjust the timer plane and the paper tape limit hole in the vertical direction. The timer should be stable on the iron stand and extend the timer out of the table.

3. What is the purpose of doing this?

Reduce the experimental error caused by the friction between the paper tape and the limit hole; ensure that the weight has enough falling space so that more points can be punched on the paper tape, which is beneficial to calculations.

4. During the experiment, what is the sequence of turning on the power and releasing the paper tape?

Turn on the power first, then release the paper tape

5. What should you pay attention to when releasing the paper tape?

Before releasing the weight, the weight should be close to the dot timer so that more dots can be struck. Stabilize the upper end of the paper tape to ensure that the weight is released from rest.

① Use a balance to measure the mass of a heavy object

② Install the dotting timer as shown in the figure

③Put the paper tape through the timer and connect the lower end to the heavy object

④ Turn on the power and release the paper tape after the timer works stably.

⑤ Cut off the power supply promptly, remove the paper tape, and mark the tape number

⑥Replace the paper tape and repeat the above steps

⑦ Arrange the equipment and reset it

Law of Conservation of Mechanical Energy PPT, Part 3: Frequently Asked Questions

Question Group 1 Experimental Operations and Procedures

Precautions for experimental operation

(1) When installing the dot timer, make sure that the two limit holes of the dot timer are in the same vertical plane, and hold the upper end of the portable paper tape so that the paper tape is in the vertical direction to reduce the friction between the paper tape and the limit hole.

(2) Heavy objects should be objects with larger mass and density and smaller volumes to reduce the impact of air resistance.

(3) Before releasing the heavy object, the heavy object should be close to the dot timer so that more dots can be scored.

(4) Turn on the power first, then loosen the paper tape and let the heavy object fall.

(5) Use paper tape with clear dots for measurement.

Question Group 2 Paper Tape Analysis and Data Processing

Question Group 3 Experimental Innovation

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