Topic: Linear motion with constant velocity and linear motion with variable velocity

Supplementary material for use in lessons in the group of natural sciences (nature, biology, chemistry, geography, physics), additional classes, science clubs. It can serve as a resource for expanding knowledge, preparing students for science competitions.

Target group

Students of the 7th grade of primary school (physics).

Core curriculum

7th‑grade of elementary school - physics

II. Movement and forces. Student:

4. use the concept of velocity to describe the straight‑line motion; calculates its value and converts its units; applies to the calculation the relationship of velocity with the path and time in which it was traveled;

5. he call linear motion with constant velocity in which the distance traveled in unit time intervals is constant;

7. he call linear uniformly accelerated motion, in which the velocity value increases in unit time intervals by the same value, and a uniformly decelerated motion - a movement in which the velocity value decreases in unit time intervals by the same value.

General aim of education

Students describe different types of movement.

Key competences

• communication in foreign languages;

• digital competence;

• learning to learn.

Criteria for success
The student will learn:

• explain what movement is about;

• define the road and velocity;

• explain what is monotonous and variable motion, and give examples of it.

Methods/techniques

• activating

  • discussion.

• expository

  • talk.

• programmed

  • with computer;

  • with e‑textbook.

• practical

  • exercices concerned.

Forms of work

• individual activity;

• activity in pairs;

• activity in groups;

• collective activity.

Teaching aids

• e‑textbook;

• notebook and crayons/felt‑tip pens;

• interactive whiteboard, tablets/computers;

• boards;

• books;

• car models.

Lesson plan overview

Before classes

• Students get acquainted with the content of the abstract. They prepare to work on the lesson in such a way to be able to summarize the material read in their own words and solve the tasks themselves.

Introduction

• The teacher asks selected students to answer the following questions:

  • What is the definition of the road and time?

  • In what metric units is the path and time expressed?

  • How can you calculate the velocity of an object?

• Students independently perform interactive exercise no. 2.

• The teacher gives the topic, the goals of the lesson in a language understandable for the student, and the criteria of success.

Realization

• Pupils in pairs perform the following task: on the board on the bench they set the car model in motion. Then one of the ends of the board lean on the book and let the car go from top to bottom and bottom up. They document their observations in notebooks using drawings.

• The teacher asks pupils to familiarize themselves with the content of the abstract and appropriately signed on each drawing the type of motion of the toy car (uniform motion, accelerated motion and delayed movement).

• The teacher collects notebooks and evaluates the correctness of the task documentation.

• The teacher displays an interactive illustration showing the types of movement and explains what the variable motion is.

Summary

• Students independently perform interactive exercise no. 1.

Homework

• Listen to the abstract recording at home. Pay attention to pronunciation, accent and intonation. Learn to pronounce the words learned during the lesson.

The following terms and recordings will be used during this lesson

Terms

Texts and recordings

Linear motion with constant velocity and linear motion with variable velocity

If the speed of movement does not change, then we call this motion linear motion with constant velocity. In reality, this rarely occurs. We often change our speed of movement. In such situations, we say that linear motion with variable velocity occurs. It can be, for example acceleration (when we increase speed) or deceleration (when we reduce speed).

• Motion is the movement of one body relative to another body.

• During motion, a distance is covered. By knowing the distance and the time in which it was covered, we can calculate the speed of movement.