7TH GRADE PRACTICE
Physics Problems: Physics and measurements, Grade 7
Phenomena, experiment, quantities and accuracy of measurements.
Here the conditions and analysis of the solution can be read without an account. In the simulator, you need to collect the same analyzes yourself: “Given,” formulas, order of steps and answer.
Problem statements
The answer options are there to check against, and the walkthrough opens under each problem.
Problem #1
Physical phenomena and research methodEvaluate the statement: A change that occurs in a body or substance and is observable or measurable.
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Mechanical, thermal, electrical, magnetic, light and sound phenomena differ in characteristics, but are studied by a common scientific method.
Answer
Problem #2
Physical phenomena and research methodEvaluate the statement: The concept of “Body, substance and matter” means: Observation records a phenomenon without controlling conditions, and experiment specifically changes conditions to test an idea.
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A glass glass is a body, glass is a substance, and the substance itself and physical fields belong to matter.
Answer
Problem #3
Physics and experimentThe student assumes that the dark surface heats up in the sun faster than the light one. Which action would best test the hypothesis?
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Then the only controllable difference is the color of the surface.
Answer
Problem #4
Measuring instruments and accuracyEvaluate the statement: A measurable property of a body or phenomenon that is expressed by a number and a chosen unit.
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Length, time, mass and temperature allow objects to be compared quantitatively, and the SI system makes the results understandable to everyone.
Answer
Problem #5
Measuring instruments and accuracyEvaluate the statement: The concept of “Scale and division value” means: Error shows the possible deviation of the result from the value that best describes the measured value.
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To read the device, two signed marks are found, their difference is divided by the number of intervals and then a reading is taken.
Answer
Problem #6
measurementsBetween the 2 cm and 3 cm marks on the scale there are five identical spaces. What is the price of one division?
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Answer
The theory behind these problems
Work through the topic if a problem will not give in.