7TH GRADE PRACTICE
Physics Problems: Mechanical movement, Grade 7
Frame of reference, path, speed, graphs and acceleration.
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 #13
Frame of reference, trajectory and pathEvaluate the statement: Change in body position relative to the selected reference body over time.
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The passenger is stationary relative to the seat, but moves relative to the road, so movement is always described relative to something.
Answer
Problem #14
Frame of reference, trajectory and pathEvaluate the statement: the concept of “Reference system” means: The trajectory is a line of motion, and the path is equal to the length of the section of this line traversed by the body.
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The choice of platform or moving car as a reference body can change the found speed and type of trajectory.
Answer
Problem #15
Mechanical movementA passenger sits on a uniformly moving bus. Relative to which object is the passenger at rest?
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Answer
Problem #16
Speed, average speed and graphsEvaluate the statement: When moving unevenly, the speed changes, and the average ground speed is equal to the entire path divided by the entire time.
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The average speed does not have to coincide with the speed on each section and even takes into account the time of stops.
Answer
Problem #17
Speed, average speed and graphsEvaluate the statement: the concept of “Uniform motion” means: A quantity showing how much the speed of a body changes per unit time.
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In a graph of path versus time, a constant speed gives a straight line, and its slope shows the value of the speed.
Answer
Problem #18
VelocityA cyclist travels 600 m in 2 minutes at a constant speed. Find the speed in SI units.
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Answer
The theory behind these problems
Work through the topic if a problem will not give in.
Formulas by topic
Look up symbols and units of measurement in the reference.