7TH GRADE · PHYSICS AND MEASUREMENTS
Physical phenomena and research method
What physics studies and how observation turns into a testable experiment.
The entire theory of the lesson is collected here; you can read it without an account. In interactive mode, the same theory appears as cards, followed by questions. with checking the answer and task, and progress is saved.
Basic Concepts
Physical phenomenon
A change that occurs in a body or substance and is observable or measurable.
Mechanical, thermal, electrical, magnetic, light and sound phenomena differ in characteristics, but are studied by a common scientific method.
Body, substance and matter
The physical body is a separate object, matter makes up bodies, and matter covers everything that exists physically.
A glass glass is a body, glass is a substance, and the substance itself and physical fields belong to matter.
Observation and experiment
An observation captures a phenomenon without manipulating conditions, while an experiment specifically changes conditions to test an idea.
A hypothesis becomes physical knowledge only after a reproducible test, and the model retains the important properties of a real object.
Physical quantities
Observation time
Duration of observation or experimental exposure.
Unit: second ·
Tasks on the topic
Statements, answer options and the walkthrough.