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Pressure on tyres of a vehicle question - Calculating weight

  • Thread starter Molly1235
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  • #1
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Homework Statement



The pressure in the tyres of a vehicle is 280 kPa. The contact area of each of the four tyres on the ground is 0.012m^2. Calculate the weight of the vehicle.

Homework Equations



Force = Pressure x Area

The Attempt at a Solution



280 kPa = 2800000 Pa

Force = 2800000 x 0.012 = 33,600N

Am I right in assuming that this is the weight of one tyre, so you have to multiply this by 4 to get the force of the whole vehicle on the ground??

I think I've gone completely wrong here so would be grateful for some help!

Thanks :-)
 

Answers and Replies

  • #2
SteamKing
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Homework Statement



The pressure in the tyres of a vehicle is 280 kPa. The contact area of each of the four tyres on the ground is 0.012m^2. Calculate the weight of the vehicle.

Homework Equations



Force = Pressure x Area

The Attempt at a Solution



280 kPa = 2800000 Pa

Force = 2800000 x 0.012 = 33,600N

Am I right in assuming that this is the weight of one tyre, so you have to multiply this by 4 to get the force of the whole vehicle on the ground??

I think I've gone completely wrong here so would be grateful for some help!

Thanks :-)
Double check your conversion of 280 kPa to Pa.
 
  • #3
77
4
Double check your conversion of 280 kPa to Pa.
Oops - wouldn't it be 280,000 Pa?
 
  • #4
I like Serena
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Am I right in assuming that this is the weight of one tyre, so you have to multiply this by 4 to get the force of the whole vehicle on the ground??
Yep!

Oops - wouldn't it be 280,000 Pa?
That looks better! :smile:
 
  • #5
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Yep!



That looks better! :smile:
So my method was correct??
 
  • #6
I like Serena
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