"Speed ​​of Movement" Mechanical Movement PPT Courseware 4

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"Speed ​​of Movement" Mechanical Movement PPT Courseware 4

There are two ways to compare the speed of an object's movement:

1. Compare the distances traveled by objects within the same period of time.

2. Run the same distance and compare the time taken.

1. Speed

The speed of an object's movement is expressed by velocity.

Speed ​​is equal to the distance traveled by an object in unit time.

Speed ​​is distance divided by time.

1. Deformation of the formula

v=s/t

s=vt

t=s/v

Formulas consisting of three quantities can be transformed

2.Unit

International main unit meter per second (m/s or m·s-1)

Commonly used units: kilometers per hour (km/h or km·h-1)

1m/s=3.6km/h

Comparative size: 1m/s>1km/h

2. Uniform linear motion

Thinking: What is the difference between the movement routes of a car on a straight road and a roller coaster?

Mechanical motion can be divided into linear motion and curved motion according to the straightness of the motion route. Linear motion changes according to speed, and is divided into uniform linear motion and variable speed linear motion.

1. Uniform linear motion

(1) Definition: The motion of an object along a straight line with constant speed is called uniform linear motion.

(2) Features: In any equal time, the distance traveled is equal.

2. Average speed

(1) The speed of common objects is changing.

(2) When doing only a rough study, variable speed motion can also be calculated using v=s/t, and the speed calculated in this way is called the average speed.

Classroom consolidation

1. According to the speed formula v=s/t, the correct statement is ( ).

A. The speed of an object is directly proportional to the distance and inversely proportional to time.

B. The speed of an object is equal to the distance traveled per unit time

C. The speed of an object is only related to the distance. The greater the distance, the greater the speed.

D. The speed of an object is only related to time. The shorter the time, the greater the speed.

2. An object moves in a straight line at a uniform speed and takes 30 seconds to cover a distance of 45 meters. Then its speed in the first 15 seconds is _______ and the distance traveled is ______m. The time it takes to cover a distance of 72 meters is ____s.

3. Xiao Ming went traveling by train with his father. In order to determine the average speed of the train, he used the following method: counting from the first collision heard at the connection between the wheel and the rail, he heard 25 collisions within 1 minute. Sound, my father told Xiao Ming that each rail is 25 m long, what is the speed of the train during this period?

Solution: s=25m ×(25-1)=600m

t=1min=60s

v=s/t=600m/60s=10m/s

Answer: The train traveling speed during this period is 10m/s.

summary

1. A method to compare the speed of movement of objects;

2. The definition of speed, the speed of common objects moving;

3. Relevant calculations and units of speed;

4. The definition and characteristics of uniform linear motion;

5. The meaning and calculation method of average speed.

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Update Time: 2024-10-20

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

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