"How to compare the speed of movement" PPT courseware on movement and force

Description

"How to compare the speed of movement" PPT courseware on movement and force

teaching objectives

1. Use speed to describe the speed of movement

2. Know the definition, unit and formula of speed

3. Be able to simply apply the speed formula and deformation formula.

4. Know what is uniform linear motion and what is variable speed linear motion.

Preview test 1: Two faster and slower methods:

Who moves faster? ________

On what basis do you base your judgment? _______________

Preview Test 2: Speed

In physics, the method of comparing the distance traveled in the same time is generally used to compare the speed of an object's movement.

Speed: In physics, the distance an object travels per unit time is called speed.

Things to note when using formulas:

1. When answering, you must have solutions and answers.

2. When applying, speed, distance, and time must be for the same object.

3. The units of the three quantities of speed, distance and time must be unified: either use basic units or use common units.

example

The total length of the Nanjing Yangtze River Bridge is 6,700 meters. When a train with a total length of 200 meters passes the bridge at a constant speed, it passes a distance of 600 meters in the first 40 seconds. How many seconds does it take for the train to completely pass the bridge?

Example question 1 answer

Known: S1=6700m S2=200m t=40s s3=600m

Ask for: t

Solution: From v=s/t

v=600m/40s=15m/s

t=s/v=（s1+s2）/v =(6700+200)m/15m/s=460s

Answer: It takes 460 seconds for the train to completely cross the bridge.

1. Pedestrians, non-motorized vehicles, tractors, wheeled special mechanical vehicles, and articulated passenger cars. Full-trailer trailers and other motor vehicles with a design speed of less than 70 kilometers per hour are not allowed to enter the highway.

2. The maximum speed of a highway shall not exceed 120 kilometers per hour, and the minimum speed shall not be lower than 60 kilometers per hour.

3. The maximum speed of small passenger cars traveling on highways shall not exceed 120 kilometers per hour, other motor vehicles shall not exceed 100 kilometers per hour, and motorcycles shall not exceed 80 kilometers per hour.

4. If there are two lanes in the same direction, the minimum speed of the left lane is 100 kilometers per hour, and the minimum speed of the middle lane is 90 kilometers per hour. If the vehicle speed indicated on the road speed limit sign is inconsistent with the vehicle speed regulations for the above-mentioned lanes, the vehicle shall be driven at the speed indicated on the road speed limit sign.

Uniform linear motion

Definition: An object moves in a straight line. If the speed remains constant, this motion is called uniform linear motion.

Features:

1.Linear motion

2. The speed remains unchanged

Operation:

Classwork: 2, 4, 5, 6 on page P48

Tutorial (preview):

1. What is the relationship between force and motion?

2. What is the content of Newton’s first law?

3. What is inertia?

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For more information about the PPT courseware "How to Compare the Speed ​​of Movement between Movement and Force", please click the PPT tag of "How to Compare the Speed ​​of Movement Between Movement and Force PPT".

File Info

Update Time: 2024-09-08

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume 2 industry PPT template

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