physics acceleration resultant forces question

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M.H4kim
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#1
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#1
a 1500kg car accelerates at 1.5m/s^2 along a horizontal road.If the frictional forces acting against the car's motion total 1000N, what driving force is exerted on the road by the car's wheels?

pls help
I used f=ma to give total force as 2250N and subtracted 1000(frictional force) from this to give me 1250N as a driving force.
However this answer is wrong and I don't know what I am doing wrong.
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Muttley79
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#2
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#2
(Original post by M.H4kim)
a 1500kg car accelerates at 1.5m/s^2 along a horizontal road.If the frictional forces acting against the car's motion total 1000N, what driving force is exerted on the road by the car's wheels?

pls help
I used f=ma to give total force as 2250N and subtracted 1000(frictional force) from this to give me 1250N as a driving force.
However this answer is wrong and I don't know what I am doing wrong.
Why have you subtracted 1000?

Write out the equation of motion properly
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M.H4kim
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#3
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#3
(Original post by Muttley79)
Why have you subtracted 1000?

Write out the equation of motion properly
F=ma?
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Muttley79
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#4
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#4
(Original post by M.H4kim)
F=ma?
Yes and what is 'F' ie the nett force? Write out the equation in full
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Muttley79
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#5
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#5
(Original post by rose.clm)
you
EDIT your post - you are breaking forum rules by giving an answer and you aren't helping the OP understand
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M.H4kim
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#6
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#6
(Original post by rose.clm)
you would add on the 1000 frictional force, as the 2250 is the EXTRA force that is required to accelerate.
I still don't get why u add 2250 and 1000
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M.H4kim
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#7
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#7
(Original post by M.H4kim)
I still don't get why u add 2250 and 1000
because it is asking for just the driving force. Not the sum of the frictional forces and the driving force
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Muttley79
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#8
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#8
(Original post by M.H4kim)
because it is asking for just the driving force. Not the sum of the frictional forces and the driving force
F is the nett forces acting on the car which is what??? Write down ALL the forces
Last edited by Muttley79; 3 months ago
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rose.clm
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#9
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#9
(Original post by Muttley79)
EDIT your post - you are breaking forum rules by giving an answer and you aren't helping the OP understand
ahh sorry I didn't know.
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Muttley79
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#10
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#10
(Original post by M.H4kim)
I still don't get why u add 2250 and 1000
HAve you sorted this out now?
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