Help with magnitude of net force

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Homework Help Overview

The discussion revolves around calculating the magnitude of the net force acting on a car driving around a circular track. The car has a mass of 1700 kg and is moving at a speed of 24 m/s on a track with a diameter of 220 m.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the equation for centripetal force and question the original poster's calculations. There are attempts to clarify the correct formula and the importance of considering gravitational force as part of the net force.

Discussion Status

The discussion is ongoing, with participants providing hints and corrections regarding the equations used. There is a focus on identifying mistakes in the original approach and exploring the correct formulation for centripetal force.

Contextual Notes

Participants note the importance of unit consistency in the equations being discussed and highlight the need for relevant equations to be listed in the original post.

Randy3463
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Homework Statement



A 1700kg car drives around a flat 220m -diameter circular track at 24m/s .

Homework Equations



What is the magnitude of the net force on the car?

The Attempt at a Solution



1700 * (24^2)/(110^2)

i got 80.92561983 round to two sig-figs so 81 and idk why
 
Last edited:
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Hello Randy3463,

Welcome to Physics Forums.
Randy3463 said:

Homework Statement



A 1700kg car drives around a flat 220m -diameter circular track at 24m/s .

Homework Equations



What is the magnitude of the net force on the car?

The Attempt at a Solution



1700 * (24^2)/(110^2)
You haven't listed any relevant equations.

What is the equation for centripetal force? (Hint: it's not F = mv2/r2. Whatever equation you used above has a mistake in it).

Also, don't forget about the gravitational force. That is one of the two components that make up the net force.
 
collinsmark said:
Hello Randy3463,

Welcome to Physics Forums.

You haven't listed any relevant equations.

What is the equation for centripetal force? (Hint: it's not F = mv2/r2. Whatever equation you used above has a mistake in it).

Also, don't forget about the gravitational force. That is one of the two components that make up the net force.

i used Fnet= mv^2/(r^2)

Fnet = mrw^2(w=omega)
 
Hello Randy3463,
Randy3463 said:
i used Fnet= mv^2/(r^2)
The above equation has a mistake in it.

You can see for yourself by checking the units. Force has units of Newtons in the SI system.

1 [N] = 1 [(kg m)/s2]

But the equation you used ends up with units of [kg/s2], which doesn't make much sense.
Fnet = mrw^2(w=omega)

And ω = v/r. So in terms of v, r, and m, what is centripetal force? (Hint: the r in mrω2 cancels out one r in ω2's denominator.)
 

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