"Measurement of Average Speed" Simple Movement of Matter PPT Courseware 3

Description

"Measurement of Average Speed" Simple Movement of Matter PPT Courseware 3

Knowledge review

How many ways are there to compare how fast an object is moving?

What is the physical meaning of speed? What is the definition?

Unit of speed, formula.

What is uniform linear motion?

Formula for finding average speed.

(1) What sport is the yacht doing?

(2) How to express the speed of a sports yacht?

(3) How to measure the average speed of a yacht?

Experiment - Measuring the average speed of a moving object

Purpose of the experiment: Practice using a scale and a stopwatch to measure the average speed of a variable-speed moving object

Experimental principle: v=s/t

experiment equipment:

Incline, trolley, scale, stop watch, metal bezel.

How to use a stopwatch:

The first press - start, the long and short hands start to rotate;

Press the second time - pause, the long and short hands temporarily stop rotating;

The third press - return to zero, the long and short pointers quickly return to zero.

Experimental steps

1. Keep the slope at a certain slope, place the car at the top of the slope, place the baffle at the bottom of the slope, and measure the distance s1 that the car will pass.

2. Measure the time t1 from when the car slides down from the top of the slope to hitting the baffle.

3. Based on the measured s1 and t1, use the formula v1=s1/t1 to calculate the average speed v1 of the car throughout the entire slope.

4. Move the baffle to the midpoint of s1, measure the time t2 it takes for the car to slide from the top of the slope through the half distance s2 on the slope, and calculate the average speed v2 of the car through the first half distance.

Class summary

1. The link of scientific inquiry

2. The average speed of the car moving on the slope (analysis process)

3. Experiment report format

Practice in class

1. An object moves along a straight road. It accelerates from rest to 20m/s in 10s and moves a total of 80m. The average speed of the object in 10s is ( )

A. 20m/s b. 10m/s

C. 8m/s D． None of them are right

2. The speed ratio of large trucks and cars traveling on the highway is 3:5, the ratio of the distances they cover is 1:3, and the time ratio of large trucks and cars is ( )

A. 9:5 b． 3:2

C. 2:3 D． 5:9

3. When a car moves in a straight line, it travels at a speed of 20m/s for the first half of the distance and 30m/s for the second half of the distance. During the entire distance, the average speed of the car is _______m/s

4. On the highway, a car is traveling at a constant speed of 72km/h. It takes 30 seconds to catch up with a bicycle that is traveling at a constant speed 450m in front of it. The speed of this bicycle is ( )

A. 5m/s B. 10m/s C. 15m/s D. 20m/s

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"Measurement of Average Speed" Simple Movement of Matter PPT Courseware 2:

"Measurement of Average Speed" Simple Movement of Matter PPT Courseware 2 Links of scientific inquiry: 1. Asking questions 2. Conjectures and hypotheses 3. Making plans and designing experiments 4. Conducting experiments and collecting evidence 5. Analysis and demonstration 6. Evaluation 7 .Communication and cooperation to explore the car on the inclined plane..

"Measurement of Average Speed" Simple Movement of Matter PPT Courseware:

"Measurement of Average Speed" Simple Movement of Matter PPT Courseware [Experience] Changes in the speed of moving objects and average speed Activity 1: Feel the change in speed while riding a bicycle freely down a slope. Activity 2: Xiao Ming is testing the 100-meter race on the playground. (1)..

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Update Time: 2024-10-20

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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