physics

posted by .

A loaded penguin sled weighing 75 N rests on a plane inclined at angle θ = 24° to the horizontal (Fig. 6-28). Between the sled and the plane, the coefficient of static friction is 0.25, and the coefficient of kinetic friction is 0.13. (a) What is the minimum magnitude of the force , parallel to the plane, that will prevent the sled from slipping down the plane? (b) What is the minimum magnitude F that will start the sled moving up the plane? (c) What value of F is required to move the sled up the plane at constant velocity?

  • physics -

    Fs = (75N,24deg).
    Fp=75sin24 = 30.51N. = Force parallel to plane acting down the plane.
    Fv = 75cos24 = 68.52N. = Force perpen-
    dicular to plane.

    Ff = u*Fv = 0.25 * 68.52 = 17.13N. =
    Force of static friction.
    Fk = 0.13 * 68.52 = 8.91 = Force of
    kinetic friction.

    a. Fap - Fp - Fk = 0,
    Fap=Fp + Ff = 30.51 + 8.91 = 39.42N =
    Min Force applied.

    b. Fap - Fp - Ff = 0,
    Fap = Fp + Ff = 30.51 + 17.13 = 47.64N.
    = Min force applied.

    c. Fap = Fp + Fk = 30.51 + 8.91 = 39.42N.

  • physics -

    part a is wrong

  • physics -

    pt A: Fp - Ff. in this case, you would do 30.51 - 17.13 = 13.38

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    A sled weighing 60 N is pulled horizontally across snow so that the coefficient of kinetic friction between the sled and the snow is 0.100. A penguin weighing 70 N rides on the sled. If the coefficient of static friction between the …
  2. Physics

    A loaded penguin sled weighing 60 N rests on a plane inclined at 20° to the horizontal. Between the sled and the plane the coefficient of static friction is 0.25, and the coefficient of kinetic friction is 0.18. (a) What is the minimum …
  3. Physics

    A loaded penguin sled weighing 81 N rests on a plane inclined at angle θ = 21° to the horizontal (Fig. 6-23). Between the sled and the plane, the coefficient of static friction is 0.24, and the coefficient of kinetic friction …
  4. Physics

    A loaded penguin sled weighing 73 N rests on a plane inclined at angle θ = 21° to the horizontal (Fig. 6-23). Between the sled and the plane, the coefficient of static friction is 0.24, and the coefficient of kinetic friction …
  5. Physics

    A loaded penguin sled weighing 66 N rests on a plane inclined at angle θ = 24° to the horizontal (Fig. 6-23). Between the sled and the plane, the coefficient of static friction is 0.22, and the coefficient of kinetic friction …
  6. Physics

    A loaded penguin sled weighing 60 N rests on a plane inclined at 20° to the horizontal. Between the sled and the plane the coefficient of static friction is 0.27, and the coefficient of kinetic friction is 0.13. (a) What is the minimum …
  7. physics

    A loaded sled is pulled by means of a rope that makes an angle of 45.0° with the horizontal. If the mass of the sled is 60.0 kg and the coefficient of friction is 0.020, how much work is done in pulling the sled for a distance of …
  8. Physics

    What is the coefficient of friction between a sled and a plane inclined 30 degrees from the horizontal if the sled just slides without accelerating when given an initial push?
  9. physics

    A child on a sled (total mass 41 kg) slides down a hill inclined at an angle θ = 22° at a constant speed 3.5 m/s. (a) How long does it take the child to travel 40 meters down the slope?
  10. Physics

    A 5.0 kg penguin sits on top of a 12 kg sled, as in the figure. A horizontal force of 45 N is applied to the sled, but the penguin keeps himself stationary by holding onto a string attached to the wall. The coefficient of kinetic friction …

More Similar Questions