Physic's equation help (Newtons laws)

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SUMMARY

The discussion centers on calculating the acceleration of a 35 kg block of cement subjected to a net force of 150 N using Newton's second law of motion. The correct formula is a = F/m, where F is the net force and m is the mass. The user initially calculated the acceleration as 4.2 m/s² but later corrected it to 4.3 m/s² after addressing rounding errors. The conversation highlights the importance of precision in calculations and rounding conventions in physics.

PREREQUISITES
  • Understanding of Newton's second law of motion
  • Basic algebra skills for manipulating equations
  • Knowledge of units of force (Newtons) and mass (kilograms)
  • Familiarity with rounding rules in numerical calculations
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  • Study the application of Newton's laws in various physical scenarios
  • Practice problems involving force, mass, and acceleration calculations
  • Learn about significant figures and rounding in scientific calculations
  • Explore advanced topics in mechanics, such as friction and net forces
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This discussion is beneficial for students studying physics, particularly those learning about Newton's laws of motion and anyone needing assistance with basic mechanics calculations.

iluvpandas
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Homework Statement


What is the acceleration of a 35 kg block of cement when pulled sideways with a net force of 150 N?


Homework Equations



what i did was f=ma
a=m/f

and just plugged the numbers in

The Attempt at a Solution



i got 4.2 but when i entered it into the assignment it told me i was wrong.
can someone explain to me where i went wrong?
 
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iluvpandas said:
what i did was f=ma
a=m/f
You mean, I hope, a = f/m.
i got 4.2 but when i entered it into the assignment it told me i was wrong.
can someone explain to me where i went wrong?
Probably just a round off error. Redo the calculation more accurately, then round off to two digits.
 
i feel so silly
the answer was 4.3
i just needed to round up =P
oh the irony,

thanks so much for helping!
 

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