How do you solve this physical question
Instructions for solving physical problems
Step sequence for solving technical tasks:
Factual problems in physics (as in mathematics) are solved in 4 steps:
- given: - Acquisition of all important given quantities.
- Read the task carefully and mark all the important parameters with a marker.
- Enter sizes with formula symbols, value and unit under given.
- searched: - Detecting the physical quantity you are looking for.
- Mark the size you are looking for with a marker in a different color.
- Enter sizes with formula symbols, value and unit under searched.
- Solution: - Calculate the desired physical quantity with the help of the correct formula
- Note it must always be there: FORMULA - FORMULA inserted - RESULT with unit
- Find the correct formula from the table of contents with the help of the table of contents.
- If necessary, convert sizes into other units.
- Insert the given values with units in the formula.
- Calculate with a calculator.
- Enter the result with the correct unit.
- Answer sentence: - Write an answer phrase related to the question
- Use the result to answer the question asked in the exercise.
Example 1 - we work together ...
Susi pushes a shopping trolley through a supermarket with a force of 220 N. It covers a distance of 80 m. Calculate the mechanical work (pushing work) that Susi did in the supermarket.
For the first example:
Here is the solution again for example 1 ->
Example 2 - we work together again ...
A crane lifts a pallet onto a ship in 1.5 minutes. It does 90 kJ of mechanical work. How big is the mechanical work done by the crane.
For the second example:
Example 3 - Try it yourself ...
A conveyor belt in the airport transports suitcases. A suitcase covers a distance of 180 meters. This takes him 2 minutes. Calculate the speed of the conveyor belt in meters per second. (Note - you still have to convert the minutes into seconds.
Here are the solutions for example 2 and 3 ->
In grade 7, the technical tasks are usually more complex. However, they are solved using the same sequence of steps. The complex task is broken down into sub-tasks and then solved in 4 work steps. Here is an example to practice with, of course with a solution
Example 4 - a complex task with a lot of explanation
A crane lifts a box with a mass of 150 kg to a height of 12 m in 30 s.
- Calculate the mechanical work (lifting work) that the crane does. (Note that the mass is given.)
- Calculate the mechanical power that the crane performed.
Here is the worksheet to practice with ->
Here is the solution to the complex task ->
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