# Thread: the force of friction

1. ## the force of friction

A racing car has a mass of 1500kg, is accelerating at 5.0 m/s^2, is experiencing a lift force of 600N up (due to its streamliend shape) and ground effects of 1000N down (due to airdams and spoilers). Find hte driving force needed to keep the car going given that the coefficient of friction is 1.0 for the car.

2. Originally Posted by checkmarks
A racing car has a mass of 1500kg, is accelerating at 5.0 m/s^2, is experiencing a lift force of 600N up (due to its streamliend shape) and ground effects of 1000N down (due to airdams and spoilers). Find hte driving force needed to keep the car going given that the coefficient of friction is 1.0 for the car.
This is a Newton's 2nd Law problem.

Find the normal force:
$\displaystyle \sum F_y = -mg + 600 - 1000 + N = 0$
(calling the +y direction upward.)

So the driving force F can be found by
$\displaystyle \sum F_x = F - \mu N = ma$
(calling +x the direction of acceleration of the car.)

-Dan