friction

  1. T

    Capstan Equation

    I need help please, as this math is beyond me For capstan , bollard frictions. I even have trusted document that has let me make sense and understand many things of knots and bollard frictions. . Jrre.org/att_frict.pdf gives .25 coefficient for nylon rope on aluminum pipe for brake force...
  2. C

    Mass of a box been pushed taking friction into account.

    This feels like a really basic question so i feel like I'm making an assumption that I shouldn't be. Max fs=us*N Fk=uk*N N=mg For the box to start to move Fk must equal Fs. So I can rearrange for m from there us*75*9.81=uk*9.81*m but this answer isn't ending up anywhere near the correct answer...
  3. H

    how do i find force of friction without μ or acceleration

    I need to find the static and kinetic coefficient of a desk for a physics lab. we have pulleys, string, a scale, a "car" and a few other things. How would I find the force of friction?
  4. N

    Friction and Weight

    ;)
  5. C

    W shape guardrail stiffness coefficient of friction

    Hello to all; I am new to this forum and in need of some help - please I am in the state of Florida where the DOT uses W shaped Guardrail and am looking for help in determining the guardrail stiffness coefficient of friction from a 30 degree offset crash impact. The result of the impact was...
  6. T

    Problem regarding friction

    Can someone solve the problem attached to this thread and explain it to me? The coefficient of friction between A and B is 0.1 The coefficient of friction between B and C is 0.2 The coefficient of friction between C and table is 0
  7. I

    Box on a wedge, no friction

    A box with mass m=0.5kg appears on top of a wedge with mass M=3,5kg. Wedge is inclined by 35°. Assume no friction exists anywhere and calculate acceleration of both block and wedge. How to solve this? Is it possible to solve this using momentum?
  8. M

    Question about Force, Motion and Friction

    I have a problem with this question: A skip of mass 2 tonnes has to be dragged along a track. The coefficient of friction is 0.7. A cable attached to the skip runs horizontally to a winch powered by an electric motor. Using the controls on the motor, the tension in the cable is gradually...
  9. M

    Friction of rotating disks

    Two disks are laying on top of each other. The disks are rotating on the same axis, are made of different materials (different friction coeffs), and are rotating at different velocities. The aforementioned are all given in the problem. Is there an equation to calculate the energy lost due to...
  10. C

    Box w/ horizontal force up incline w/ friction

    Alright, I have spent the last 9 hours trying to figure out how on earth I am supposed to determine the horizontal force in this problem. https://drive.google.com/file/d/1dtu33st37WncE1VSOSB66XabyE05dAb3/view?usp=sharing I've got to be missing something obvious. I know that the answer to...
  11. L

    Friction

    Help please! Confused as heck!
  12. H

    Homework regarding relation between friction and velocity/acceleration. Just need my

    Hi there. Our teacher gave us a table related to friction and velocity/acceleration. It basically gives a single scenario, and we're required to figure out which force is stronger (pulling force vs. friction) and which direction the object will go (left, right, up the slope, down the slope)...
  13. J

    Newtonian Mechanics : Block a wedge with no friction. How to solve for accelerations?

    A wedge with mass M rests on a frictionless horizontal table top. A block with mass m is placed on the wedge . The base of the wedge is at an angle of A degrees to the horizontal. There is no friction between the block and the wedge. The system is released from rest. Determine: 1) The...
  14. B

    Book friction problem

    Problem Suppose you are holding a heavy physics book upright between your hands as shown in the figure to the right. The mass of the book is 4.00 kg. When your right hand applies a force of 50.0 N normal to the book as shown, the book remains at rest. b.)What is the minimum possible...
  15. B

    Cylinder moving on plane with friction

    A hollow cylinder with mass m and radius R stands on a horizontal surface with its smooth flat end in contact the surface everywhere. A thread has been wound around it and its free end is pulled with velocity v in parallel to the thread. Find the speed of the cylinder. Consider two cases: (a)...
  16. B

    Cylinder rotating on a horizontal surface with friction

    A hollow cylinder with mass m and radius R stands on a horizontal surface with its smooth flat end in contact the surface everywhere. A thread has been wound around it and its free end is pulled with velocity v in parallel to the thread. Find the speed of the cylinder. Consider two cases: (a)...
  17. O

    friction force

    The block m is on block M. An external force apply to M. If we think m=3Kg and M=6Kg ,between M and floor there is no friction and between m and M μ=0.4. What is the maximum force with which the lower block can be pulled horizontally so that the two blocks move...
  18. O

    friction force

    Can you solve this problem The block m is on block M. An external force apply to M. If we think m=3Kg and M=6Kg ,between M and floor there is no friction and between m and M μ=0.4. What is the maximum force with which the lower block can be pulled horizontally...
  19. S

    Friction Force Question

    A 148-kg crate rests in the bed of a truck that slows from 61 km/h to a stop in 10 s. The coefficient of static friction between the crate and the truck bed is 0.589. (a) Will the crate slide during the braking period? (b) What is the minimum stopping time for the truck in order to prevent...
  20. O

    Reaction of the friction

    I am a student from Sri Lanka, According to the newton's third law there is a reaction for the each external force. But I have a problem that what is the reaction of the friction force. Is it form to the direction of moving the object?