How Do You Calculate the Net Force on an Accelerating Car?

AI Thread Summary
To calculate the net force on an 850 kg car accelerating from rest to 33 m/s over 120 m, the acceleration is first determined using the equation v^2 = u^2 + 2as, resulting in an acceleration of approximately 4.54 m/s². The net force is then calculated using F = ma, yielding a force of about 3856.88 N. The calculations and methods used in the discussion are confirmed to be correct. Participants express appreciation for the forum's helpfulness. The thread highlights the importance of understanding the relationship between force, mass, and acceleration in physics problems.
discosucks
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Homework Statement



An 850 kg car accelerates uniformly from rest to 33 m/s in a distance of 120 m. What is
the magnitude of the net force acting on the car?

Homework Equations



F = ma

dynamic equations

The Attempt at a Solution



So i think i have this one sorted but just posting to see iv got it right .

Seeing as i need acceleration to find the force i have to find it using the info i have so

a= ?
s= 120
v = 33
u = 0
t = not needed .

v^2=u^2+2as

(33)^2 = 0 + 2(a)120

1089 = 240a

4.5375 = a

4.5375 m/s^2

F = ma

850 x 4.5375

3856.875 N



 
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discosucks said:
v^2=u^2+2as
Method looks right. (I haven't checked your arithmetic.)
 
It seems right ,,.
 
Great! thanks lads! this site rocks! need to find a similar one for chemistry and biology haha
 

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