Physics

posted by .

A couch with a mass of 100 kg is placed on an adjustable ramp connected to a truck. When one end of the ramp is raised, the couch begins to move downward. If the couch slides down the ramp with an acceleration of .7 meters per second when the ramps angle is 25 degrees, what is the coefficient of kinetic friction between the ramp and the couch? How do i figure this out?

  • Physics -

    component of weight down ramp = mg sin(theta)

    friction up ramp = u mg cos(theta) where u is the coeff of friction

    therefore, we have

    mg sin(theta)- umg cos (theta) = ma

    or a = g(sin(theta) - u cos(theta))

    so, sub 25 deg for theta, 0.7m/s/s for a and 9.8m/s/s for g and get

    u = 0.39

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    8)If an airplane is moving at a constant velocity of 400 m/s for 20 s, what is its acceleration during this period?
  2. Physics

    A coach with a mass of 100 kg is placed on an adjustable ramp attached to a truck. As one end raises, the couch begins to move downward. If it sldes with an acceleration of .79 m/s^2 at 12 degrees, what is the coefficient of kinetic …
  3. physics

    A couch with a mass of 100 kg is placed on an adjustable ramp attached to a truck. As one end raises, the couch begins to move downward. If it sldes with an acceleration of .79 m/s^2 at 12 degrees, what is the coefficient of kinetic …
  4. physics

    A mover pushes a couch a distance of 4 m to the top of a ramp into the back of a truck using 500 N of force. A) What is the work input of the mover?
  5. physics

    A mover pushes a couch a distance of 4 m to the top of a ramp into the back of a truck using 500 N of force. A) What is the work input of the mover?
  6. PHYSICS

    A 100-kg box is placed on a ramp. As one end of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 15 degrees. What is the coefficient of static friction between box and ramp?
  7. Physics

    An 100kg box is placed on the ramp. As one end on the ramp is raised the box begin to move down ward just as the angle of inclination reaches 15 degree . What the coeffenict of static friction between box and ramp .. ?
  8. Phyics

    A box of mass 14.0 kg sits on a horizontal steel ramp 4.8 m long with a coefficient of static friction of 0.40 between the ramp and the box. The end of the ramp is slowly lifted until the box begins to slide down the ramp. What angle …
  9. Math

    A 100-kg box is placed on a ramp. As one end of the ramp is raised, the box begins to move downward just as the angle of inclination reaches 15◦. What is the coefficient of static friction between the box and the ramp?
  10. Science

    Two people are pushing a couch from opposite sides. One person is pushing to the right with a force of 3 N. The other person is pushing to left with a force of 4 N. Which of the following best describes the movement of the couch?

More Similar Questions