Draw the trajectory of the wheel rim point. Experimental task

Oleg Fedorovich Kabardin (1933–2011) is the author of a country-wide reference book on physics, one of the authors and scientific (title) editors of the physics course for in-depth study (grades 10–11). He wrote a new course in physics for the basic school, which became the basis for the line of teaching materials in physics "Archimedes". Today this course is one of the most interesting and promising on the educational literature market.

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Covers Draw the trajectory of point A, marked on the bicycle wheel, in relation to: “The cyclist is moving along a horizontal straight road. Draw the trajectory of movement of point A, marked on the wheel of the bicycle, relative to: a beetle sitting on the axis of the wheel; a beetle sitting on the wheel axle; an ant sitting at point B on a wheel; an ant sitting at point B on a wheel; a man standing by the side of the road. " a man standing by the side of the road. "

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"UMK on natural science" - Natural science: methods of scientific knowledge of nature. Science in basic school. UMK composition Natural science with the basics of ecology. Course building structure. Features of teaching materials. For ideas, as well as for plants, there comes a certain time. Preparatory block. Man, his activities are included in the structure itself.

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• Mechanical movement is a change over time in the position of a body in space relative to other bodies. Mechanical movement is relative.
• The line along which the body moves is called the trajectory of movement.
• The length of the trajectory is called the path traversed by the body.
• The system of the world proposed by Copernicus, in which the Earth and other planets move around the Sun, is called the heliocentric system of the world.

Questions and tasks

First level

1. Give your own examples to illustrate the relativity of motion.
2. What is body trajectory? Draw the approximate trajectories of multiple bodies.
3. What movement is called straight-line? curvilinear? Give some examples of movement along straight and curved paths.
4. What is the path?
5. The man walked 5 km. Was the trajectory of its movement straight or curved if the distance from the starting point of its trajectory to the final one is 3 km?
6. The car drove twice along the 100 km ring road. What is the distance covered by the car?

   Second level

7. Give examples showing that the trajectory of a body's movement depends on which body the movement of this body is considered relative to.
8. Draw an approximate trajectory of movement of the point marked with paint on the tire of the wheel of a riding bicycle: a) relative to the cyclist; b) in relation to a person standing by the road.
9. Will the trajectory of a student who left home and returned home be closed, if we consider his movement relative to the plane, which during this time flew from Moscow to Kazan?
10. Under what condition is the trajectory of the ship that made trip around the world, will be closed not only to the Earth, but also to the Sun?
11. The tourist walked 3 km north, turned right and walked another 4 km. Draw in a notebook the trajectory of the tourist on a scale of 1 km to 1 cm. Find what the path traveled by the tourist is equal to and what is the distance from the starting point of his trajectory to the final one.
12. Make a problem about the trajectory of the body, the answer to which would be: "Relative to the Earth - open, and relative to the carriage - closed."

Home laboratory

Keeping the pencil motionless relative to the table, pull out a sheet of paper from under the pencil so that a pencil mark remains on the sheet. Is this trace the trajectory of the end of the pencil? If so, when moving relative to which body?