Does the Teacher's Edition Have a Mistake in This Science Problem?

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SUMMARY

The discussion centers on a potential mistake in a science textbook's Teacher's Edition regarding a physics problem involving force and mass. The problem requires calculating the mass of a skateboard when a force of 30N is applied, resulting in an acceleration of 0.5 m/s². The correct calculation, using the formula F=ma, reveals that the skateboard's mass is 60kg, which, when subtracting the user's mass of 58kg, indicates the skateboard itself has a mass of 2kg. This conclusion confirms that the textbook may contain an error if it provides a different answer.

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  • Knowledge of units of measurement in physics (Newtons, kilograms)
  • Ability to perform basic arithmetic operations
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This discussion is beneficial for students studying physics, particularly those in middle school, as well as parents and educators involved in homeschooling who seek clarity on physics concepts and problem-solving techniques.

LisaandCaiti
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I have a problem in my science book,we think the teachers edition may have a mistake? Can someone look at my problem and explain how to find the answer? I am home schooled, and like mom said, 7th grade was too many years ago!


Calculate mass: You push yourself on a skateboard with a force of 30N and accelerate at 0.5 m/s squared. Find the mass of the skateboard if your mass is 58kg.

We keep coming up with a different answer than the book. Can someone explain this so we can make sure we are doing it correctly?

Thank You!

<< personal e-mail address edited out by berkeman >>

 
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The equation is force = mass * acclearation or F=ma
Since we know f and a and want m we have to re-arrange the formula this gives m=f/a
If you plug in the numbers you get m = 30N/0.5ms-2 = 60kg
Since you have a mass of 58.5kg the mass of the skateboard is the difference.
 
you divide 30n by 0.5 m/s and you will get ur anwser which you then subtaract 58 from and you will get ur anwser it will have this unit of measure kg*m/s N
 

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