"Measuring Average Speed" Mechanical Motion PPT Courseware 5

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"Measuring Average Speed" Mechanical Motion PPT Courseware 5

Experimental investigation: changes in the speed of a car sliding down an inclined plane

Step 1: Ask questions

Does the speed of the car change when it slides down the slope? How?

Session 2: Conjectures and Hypotheses

The speed of the car when sliding down the slope may increase.

Step 3: Make plans and design experiments

How to design an experiment?

Step 4: Conduct experiments

Preparation:

1. Adjust the height of the slope to a moderate level so that the car just slides down the slope, not too fast.

2. Practice the operations of stopping the watch: starting, stopping the watch, returning the watch, and reading.

Precautions:

1. Align the front end of the trolley with the starting line and release it from a still position.

2. The start of timing and the release of the car should be at the same time. If a collision occurs, the watch will be stopped immediately. Must be operated by dedicated personnel. You should practice several times before the formal experiment. Once you are proficient, the measured data will be more accurate.

Class summary:

1. What did you gain from this class?

(1) Experience the process of scientific inquiry and use experimental methods to prove whether your opinions are correct.

(2) Learned how to use experiments to explore changes in the speed of objects.

2. What should be clearly understood in the study of physics experiments at the junior high school level?

The purpose of each experiment, experimental principles, experimental equipment, experimental procedures, experimental conclusions, precautions...

Example: An object moves in a straight line at a uniform speed. The relationship between distance and time is as shown in the figure. It can be seen from the figure that the relationship between the speeds of two moving objects A and B is ( )

A, vA > vB B, vA < vB

C. vA = vB D. Insufficient conditions and cannot be determined

Example: A study group conducted observation and research on a car moving in a straight line on a straight road. They recorded the distance and time taken by the car within a certain period of time, and based on the recorded data, they drew the distance and time image (s-t graph) as shown in the figure. What information can you get from this image?

(1)_____________

(2)_____________

(3)_____________

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Update Time: 2024-10-19

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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