Acceleration of vehicle when given torque to the wheels

In summary, the acceleration of a vehicle with a maximum of 381 foot pounds of torque is .30 meters2/second2.
  • #1
sngl_cam
6
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Acceleration of vehicle when given torque to the wheels...

Ok so I am trying to figure out the acceleration of a vehicle that has a maximum of 381ft lbs of torque.With a mass of roughly 1700kg. If I use the formula f=ma, a=f/m and if I convert ft lbs to Nm its roughly 517/1700=.30m^2/s^2?

what does meters squared/ seconds squared mean?

then I tried F=Torque/radius, which led me to 1850/1700=1.09m/s^2??

right now I am just throwing stuff out there, I am confused at this point, so anything to help clear this up would be great...

Also, once I find the acceleration, I need to find the time the vehicle would take to travel 402.336meters...

thanks sooooo much for anyone who replies.
 
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  • #2


I think some more info is needed. Is there a wheel radius?
 
  • #3


the wheels have a radius of 0.3048meters
 
  • #4


I think you should try doing this problem symbolically. You seem to be getting caught up using the wrong numbers and losing track of your units. Try leaving your variables as F, a, r, etc. and see if you can't find an expression for F.
 
  • #5


do you know if I am somewhat on the right track at least?
I think I am mixed up with the F/m=a units... but I don't know really how to work with the radius... I am really trying to figure this out as quick as possible but I am trying to get another physics project done so if you could give me a hint or something to go on.
 
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  • #6


my professor said using F=ma is fine for torque but does that mean that I show torque as Nm or do I have to some how convert it to N by dividing Nm by the radius of the wheels, to use as the force?
 
  • #7


The units of torque are force*distance. You don't convert it to force, you find the force the torque creates.

But yes, that is the idea. Torque divided by radius of the wheels will give the horizontal force that the wheels exert on the axle, assuming the wheels don't slip on the pavement.

Here's how I thought about it: If, at any given instant, the wheels aren't slipping, then that means the point where the wheel touches the pavement isn't moving with respect to the pavement, or with respect to us watching the car from the roadside. If that point isn't moving, it would be sensible to pick that as the pivot point. Then, the force that the wheel is exerting is Torque divided by the distance from that pivot point. There's an axle directly above the pivot, and it's a distance r away. So, torque divided by r is the forward force the axle is feeling.

Always start by finding a good pivot point!
 
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  • #8


so I have the right idea of taking the torque/wheel radius
which I then would divide by the mass to get the vehicle acceleration?
Units being m/s^2?
 
  • #9


Haha, yeah...do you really need my help with Newton's 2nd? I think you can probably handle it from here.
 
  • #10


:) Thanks man
 
  • #11


My pleasure!
 

FAQ: Acceleration of vehicle when given torque to the wheels

1. How does torque affect the acceleration of a vehicle?

Torque is a measure of rotational force, and it directly affects the acceleration of a vehicle. When torque is applied to the wheels, it causes them to rotate and propel the vehicle forward. The greater the torque, the greater the acceleration.

2. Is torque the only factor that affects vehicle acceleration?

No, torque is not the only factor that affects vehicle acceleration. Other factors include the weight of the vehicle, the power of the engine, and the efficiency of the transmission system.

3. How does the gear ratio of a vehicle affect its acceleration?

The gear ratio of a vehicle determines how much torque is delivered to the wheels from the engine. A lower gear ratio provides more torque, resulting in faster acceleration, while a higher gear ratio provides less torque and slower acceleration.

4. Can torque be increased to improve a vehicle's acceleration?

Yes, torque can be increased by modifying the engine or adding a performance chip, which can improve a vehicle's acceleration. However, this should be done carefully and within the limits of the vehicle's capabilities to avoid damaging the engine.

5. How does the type of transmission affect a vehicle's acceleration?

The type of transmission can greatly impact a vehicle's acceleration. A manual transmission allows for more control over gear shifts and can provide faster acceleration, while an automatic transmission may have a delay in shifting gears, resulting in slower acceleration.

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