# Calculating Force Needed to Maintain Constant Speed in Car

• TT0
In summary, the car's constant speed of 10ms-1 means that the acceleration is 0 ms-2, resulting in a force of 0. When there is friction present, the force needed to overcome it and maintain the same speed would be equal to the force of friction. This includes overcoming drag, axle friction, and rolling resistance. In the case of no friction, the force needed to maintain the constant speed would be zero.
TT0
A car whose mass is 1000 kg is traveling at a constant speed of 10ms-1. Neglecting any friction, how much force will the engine have to supply to keep going the same speed?

F = ma

Since it is traveling at a constant speed then acceleration = 0 ms-2 hence the answer is 0.
F = m x a
F = 1000 x 0
F = 0

My question is:
Firstly am I right?

And secondly why does everything have to be accelerating? If the car was traveling at a constant speed of 10ms-1 and there was friction how would you calculate the force needed?

If the car is traveling in a straight line without going up hill or anything like that, then yes, the force is zero. If there was friction, the force would have to be equal to force friction, so that the ΣF=0.

TT0
Ok thanks

TT0 said:
If the car was traveling at a constant speed of 10ms-1 and there was friction how would you calculate the force needed?
To be clear, friction between tyres and road only slows a car down when the car is braking. In the real world, a car traveling at constant speed on the flat needs power to overcome drag, axle friction and rolling resistance. Rolling resistance is the force required to deform the tyres as they rotate.

TT0
It"s right if you are in space no friction .

TT0
Uh, there is friction in space..

TT0
There's just a lot less air resistance or drag force

TT0
If there is friction, and you want to keep the car traveling at constant speed, the force going forward would have to be equal to the retarding force of the friction (to balance it out). But yes, your answer is correct :)

TT0
Thanks everyone

## 1. How do you calculate the force needed to maintain constant speed in a car?

To calculate the force needed to maintain constant speed in a car, you can use the equation F = m x a, where F is the force, m is the mass of the car, and a is the acceleration. You can also use the equation F = µ x N, where µ is the coefficient of friction and N is the normal force.

## 2. What factors affect the force needed to maintain constant speed in a car?

The force needed to maintain constant speed in a car is affected by factors such as the mass of the car, the incline of the road, the coefficient of friction between the tires and the road, and any external forces acting on the car (such as wind resistance).

## 3. How does the incline of the road affect the force needed to maintain constant speed in a car?

If the road is on an incline, the force needed to maintain constant speed in a car will increase. This is because the car will need to overcome the force of gravity pulling it down the incline, in addition to any other forces acting on it.

## 4. What happens if the force needed to maintain constant speed in a car is greater than the force being applied?

If the force needed to maintain constant speed in a car is greater than the force being applied, the car will slow down. This could happen if the car is going up a steep incline, or if there is a strong headwind pushing against the car.

## 5. How can you reduce the force needed to maintain constant speed in a car?

To reduce the force needed to maintain constant speed in a car, you can decrease the mass of the car, reduce the incline of the road, or increase the coefficient of friction between the tires and the road. Additionally, driving at a steady speed and avoiding sudden changes in speed can also help reduce the force needed to maintain constant speed.

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