"Fast and Slow" The World of Movement PPT Courseware 4

Description

"Fast and Slow" The World of Movement PPT Courseware 4

learning target:

1. Understand the concept of speed and be able to use speed to describe the movement of objects.

2. Understand the speed formula and be able to use it to perform simple calculations.

3. Know the characteristics of uniform linear motion and variable speed linear motion.

1. How do you compare the speed of an object’s motion?

A track and field race is going on, how do we judge who is running faster?

Comparison method:

(1) Same time and distance. (audience)

(2) The same distance and time. (referee)

In physics, we use "the same time versus distance" and introduce a physical quantity to represent the speed of an object's movement, which is velocity.

2. Speed

(1) Definition: In physics, the distance traveled per unit time is called speed.

That is: speed = distance/time

If we use the symbol v to represent speed, s to represent distance, and t to represent time, the above formula can be written as: v=s/t

The physical meaning of speed: In physics, speed is used to express how fast an object moves.

(2) Unit of speed

The unit of speed is a composite of the units of distance and time. If the unit of distance is meters, the unit of time is seconds.

The main unit of speed is "meter/second" using the symbol table

Expressed as m/s or m·s-1 read as meters per second

Commonly used units include “kilometer/hour”

Expressed symbolically as km/h

3. Linear motion

(1) Uniform linear motion

The linear motion in which an object moves at a constant speed is called uniform linear motion.

(2) Variable speed linear motion

Linear motion with changing speed is called variable speed linear motion.

In nature, most motion is linear motion with variable speed.

In variable speed linear motion, distance and time are corresponding, and the speed we calculate is the average speed of the segment.

4. Consolidate practice

1. A train moves in a straight line at high speed and covers a distance of 150m in 5s. Its speed in the first 2s is ______m/s. Combined with ________km/h, the distance traveled is ________m.

2. A person rides a bicycle along a straight road. The distance traveled in the first s is 2m, the distance traveled in the second s is 3m, and the distance traveled in the third s is 4m. Find:

①The average speed in the first 2s is _______m/s.

②The speed in the 3rd second is _____m/s.

five. summary

Through the study of this section, we know how to compare the speed of an object's movement, understand the requirements for solving physical calculation problems, know the concepts and calculation formula units of speed, and can perform simple calculations.

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Update Time: 2024-10-02

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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