Physics

posted by .

6)A 700kg car is travelling at a constant velocity of 35m/s when it slams on the brakes and comes to a stop. How far did the car travel during braking if the coefficient of kinetic friction is 0.62 ? (Hint: if the accelerator is no longer being pressed, is there an applied force by the engine?)
kinetic friction= μk(normal force) 35m/s = .62(700X9.8N/kg)
35m/s=.62(6860) .. is this the correct way to do it?

  • Physics -

    No, that is not the correct way. You don't multiply μk by velocity * normal force to get friction force.

    (Friction force)*X = μk*M*g*X
    = Intitial K.E. = (1/2)M(Vi)^2
    M cancels out. Vi is the initial velocity.

    Solve for X.

    X = (1/2)(Vi)^2/(μk*g)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A driver of a 7550 N car passes a sign stating "Bridge Out 25 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time?
  2. physics

    A driver of a 7550 N car passes a sign stating "Bridge Out 25 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time?
  3. physics

    A driver of a 7550 N car passes a sign stating "Bridge Out 25 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time?
  4. PHYSICS

    A driver of a 7400 N car passes a sign stating "Bridge Out 30 Meters Ahead." She slams on the brakes, coming to a stop in 10 s. How much work must be done by the brakes on the car if it is to stop just in time?
  5. physics

    A car starts from rest and accelerates uniformaly at the rate of 0.98m/s in 1hr.what is its final velocity?
  6. Physics

    A car of mass 1550 kg is travelling at 75.0 km/h on a dry horizontal concrete surface when the driver applies the brakes licking the wheels. (a) How far does the car travel before coming to rest?
  7. Physics

    1) A car moving along a straight stretch of road at 60 mph [26.7 meters/sec]. The driver makes slams on his breaks locking them so that the car skids to a stop. Assume a constant braking force due to friction, and a kinetic friction …
  8. Physic

    6. A car is moving along a straight road at 60 mph [26.7 meter/sec ]. The driver makes slams on his breaks locking them so that the car skid s to a stop. Assume a constant braking force due to friction , and a kinetic friction coefficient …
  9. Physics

    The driver of a car is going 30 m/s slams on his brakes, the car's tires lock, and the car skids to a stop on a level roadway. The kinetic coefficient of friction between its tires and the pavement is 0.75 as it slides. Draw a free …
  10. Physics

    A driver in a car, originally moving at 13.1 m/s, applies the brakes until the car comes to a stop. The car moves a distance of 34.1 m while braking. How much time did it take for the car to stop?

More Similar Questions