Two blocks Definition and 242 Threads

  1. K

    Two blocks held against each other

    Homework Statement Two blocks m (16kg) and M (88kg) are as shown in the figure. If the co-efficient of friction b/w the blocks is 0.38 but the surface beneath the block is frictionless, what is the minimum force required to hold m against M? How would you go about solving this kind of a...
  2. R

    Minimum Force Required to Keep 2 Blocks Sliding on Frictionless Surface

    The two blocks shown above are sliding across a frictionless surface by a force F from the left. The two blocks are not attached but the coefficient of static friction between the two is μs = 0.39. The mass of the smaller block is m1 = 14 kg and the mass of the larger block is m2 = 80 kg. a)...
  3. I

    Two Blocks being pulled until one slips

    Homework Statement The coefficient of static friction is 0.621 between the two blocks shown. The coefficient of kinetic friction between the lower block and the floor is 0.129. Force F causes both blocks to cross a distance of 5.10 m, starting from rest. What is the least amount of time in...
  4. A

    Magnitude in force of two blocks connected by rope.

    Homework Statement Two blocks are connected by a rope F (Vertical in the drawing, with force F pulling on a rope, block 1 attached to that rope, then there ia another rope off the bottom of block 1 that attaches to block 2). The block starts from a rest and moves upward a distance of 3.00m in...
  5. M

    Solving the Kinetic Friction and Tension of Two Blocks

    Homework Statement Block A (M1-5 kg) is on a horizontal surface and block B (M2-2 kg)to the left resting on a 30 degree incline. the two are connected to each other by a mass-less rope over a massless pulley and are moving down hill (to the left) at constant velocity. a) Find the...
  6. M

    Newton's Laws with Friction: Two Blocks

    Homework Statement Part 1 Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.03 kg, M2 = 3.40 kg, and F = 5.10 N, find the size of the contact force between the two blocks...
  7. P

    Two blocks sliding on top of each other

    A 4 kg block is placed on top of a 8kg block, placed on a table with no friction,which is subject to force of 30N. What is the coefficient of friction needed between the two blocks so that the the top doesn't slide on the other one? What i did was find the acceleration of the bottom block and...
  8. J

    Do Weight Differences Affect Speed on a Frictionless Hill?

    Homework Statement A 1-lb block and a 100-lb block are placed side by side at the top of a frictionless hill. Each is given a very light tap to begin their race to the bottom of the hill. In the absence of air resistance, what can you conclude about the outcome of the race? Homework...
  9. E

    Conservation of Energy involved with a spring and two blocks and a pulley.

    Homework Statement Two blocks, of masses M = 2.1 kg and 2M are connected to a spring of spring constant k = 210 N/m that has one end fixed, as shown in the figure below. The horizontal surface and the pulley are frictionless, and the pulley has negligible mass. The blocks are released from...
  10. C

    Forces and Pulleys of two blocks

    Homework Statement Two blocks are connected by a rope that passes over a set of pulleys. One block has a weight of 412N and the other has a weight of 908N. The rope and the pulleys are massless and there is no friction. (a) What is the acceleration of the lighter block? (b) Suppose that the...
  11. H

    Two blocks on top of eachother with pulleys

    Homework Statement A 3.0-kg block sits on top of a 5.0-kg block which is on a horizontal surface. The 5.0-kg block is pulled to the right with a force F. The coefficient of static friction between all surfaces is 0.60 and the kinetic coefficient is 0.36. a)What is the minimum value of F...
  12. K

    Finding equation of equlibrium for rod and two blocks

    Homework Statement A slender rod AB of weight W is attached to blocks A and B which move freely in the guides shown. The constant of the spring is k, and the spring is unstretched when \theta = 0. (a) Neglecting the weight of the blocks, derive an equation in W, k, l, and \theta which must be...
  13. P

    Max Horizontal Force for Two Blocks to Accelerate Without Slipping

    Homework Statement A block of mass M_1 rests on a block of mass M_2 which lies on a frictionless table. The coefficient of friction between the blocks is \mu . What is the maximum horizontal force which can be applied to the lower ( M_2 ) block for the blocks to accelerate without...
  14. J

    Algebraic expressiong for two blocks

    Homework Statement Two blocks are sliding to the right across a horizontal surface, as the drawing shows. In Case A the masses of both blocks are 2.2 kg. In Case B the mass of block 1, the block behind, is 7.0 kg, and the mass of block 2 is 3.5 kg. No frictional force acts on block 1 in either...
  15. B

    AP Physics Free Response: Friction between two blocks

    Homework Statement Block A of mass 2M hangs from a cord that passes over a pulley and is connected to block B of mass 3M that is free to move on a frictionless horizontal surface. The pulley is a disk with frictionless bearings, having a radius R and moment of inertia 3MR^2. Block C if mass...
  16. S

    Coefficient of kinetic friction between the two blocks

    Homework Statement The coefficient of kinetic friction between the two blocks is 0.30. The surface of the table and pulleys are frictionless. m1=2 kg m2=3 kg m3=10 kg Homework Equations \SigmaF=ma T2-m3g=m3a T1-T2=m2a friction-T1=m1a The Attempt at a Solution T2=m3g+m3a...
  17. B

    How Do Wood Blocks Behave in a Collision on a Frictionless Surface?

    A block of wood of mass m1 = 0.15 kg slides to the right on a frictionless horizontal table with an unknown speed. It collides with a second piece of wood of mass m2 = 0.30 kg which is stationary and attached to a spring with a spring constant of k = 159.00 N/m. The two pieces of wood stick...
  18. K

    Calculating Block Velocity and Bullet Speed in Collision | Physics Homework

    Homework Statement An 8.52g bullet is fired into a 385g block that is initially at rest at the edge of a table of h = 1.03 m height. The bullet remains in the block, and after the impact the block lands d = 2.15 m from the bottom of the table. How much time does it take the block to reach...
  19. M

    Two Blocks Sliding, Newtons 3rd

    Homework Statement The coefficient of static friction is 0.55 between the two blocks in Figure P8.32. The coefficient of kinetic friction between the lower block and the floor is 0.20. Force FT causes both blocks to cross a distance of 5.0 m, starting from rest. What is the least amount of...
  20. C

    Calculating Coefficient of Friction for Two Blocks

    Homework Statement We have two block of mass that rest upon each other. A force is applied to the top block and that cause both of the blocks to accelerate at different rates. What are the coefficient of friction needed to achieve this, assuming that bottom block rest on a frictionless...
  21. T

    What is the acceleration of a falling block attached to a pulley system?

    Homework Statement A block of mass m1 = 2 kg rests on a table with which it has a coefficient of friction µ = 0.75. A string attached to the block passes over a pulley to a block of mass m3 = 4 kg. The pulley is a uniform disk of mass m2 = 0.5 kg and radius 15 cm. As the mass m3 falls, the...
  22. C

    How to find tension between the two blocks?

    Homework Statement Two blocks connected with a massless rope ,are being dragged by a horizontal force.suppose F= 68N, Mass1= 12 ,Mass2=18kg and coeffecient of fraction between each block and surface is 0.10. 12kg ------T--------18kg-----68N---> Find tension and magnitude of the aceleration...
  23. J

    How Is Total Work Calculated for Two Connected Blocks with Friction?

    Homework Statement Two blocks are connected by a very light string passing over a massless and frictionless pulley . The 20.0 N block moves 75.0 cm to the right and the 12.0 N block moves 75.0 cm downward. Find the total work done on the 20 N block if \mu _s\;=(coeff. of static...
  24. A

    Force of friction on two blocks

    Homework Statement Two blocks, A and B remain stuck together as they are pulled to the right by a force F = 200 N to the horizontal right. B is on a rough horizontal tabletop (coefficiant of kinetic friction is .800) a) what is the acceleraton of the system b) what is the force of friction...
  25. P

    Two blocks on a frictionless horizontal surface connected by a massless string

    Homework Statement Two blocks on a frictionless horizontal surface are connected together by a massless string. A second massless string is attached to the block of mass m2, as shown. Suppose you pull on this second string with a horizontal force directed to the right. Determine the ratio...
  26. C

    Horizontal Tension Between Two Blocks?

    Homework Statement Two blocks connected by a rope of negligible mass are being dragged by a horizontal force Fvec. Suppose Fvec = 70.0 N, m1 = 11.0 kg, m2 = 26.0 kg, and the coefficient of kinetic friction between each block and the surface is 0.100. Determine the tension T. Diagram: [ m1 ]...
  27. S

    Moving two blocks connected by a spring

    Homework Statement m_1, v_1f m_2, v_2f m_2 = m_1 = m Homework Equations KE = .5mv^2 W = F*d spring: F= -kx pot energy = PE = -.5kx^2 The Attempt at a Solution A) K + U = .5m(v_1f)^2 + .5m(v_2f)^2 - .5kx^2 .5(.1kg)(v_1f)^2 + .5(.1kg)(v_2f)^2 -.5(100N/m)(.02m)^2 B) ...
  28. M

    What is the scale reading when the block starts to slide down the incline?

    Homework Statement say we have a block resting on a incline of a wedge (the incline is 40 degrees). the wedge is on a scale(mass of block is .2 kg and mass of wedge is .8kg).if the block is at rest (due to to static friction) the scale would read 9.8N. but let's say we eliminate the friction...
  29. B

    How Do You Calculate Tension in a Two-Block Pulley System?

    Homework Statement Two blocks are connected by a light string passing over a pulley of radius 0.35 m and moment of inertia I. The blocks move (towards the right) with an acceleration of 1.50 m/s2 along their frictionless inclines (see the figure)...
  30. B

    Two blocks connected by string with an angled force applied

    A 3.5 kg block (m1) and a 1 kg block (m2) are connected by a string and are pushed across a horizontal surface by a force applied to the 1 kg block as shown below. The coefficient of kinetic friction between the blocks and the horizontal surface is 0.3. If the magnitude of vector F is 27 N...
  31. D

    Two blocks and a pulley homework

    Homework Statement The two blocks are connected by a light string that passes over a frictionless pulley with a negligible mass. The 3 kg block lies on a rough horizontal surface with a constant coefficient of kinetic friction 0.1. This block is connected to a spring with spring...
  32. S

    How do the blocks of power have the same kinetic energy?

    Homework Statement the force is given as F the distance pushed is given as D Homework Equations W= F*d F=ma KE = 1/2 mv^2 The Attempt at a Solution the blocks have the same kinetic energy
  33. S

    Two Blocks | Same Kinetic Energy (KE) Calculation

    Homework Statement the force is given as F the distance pushed is given as DHomework Equations W= F*d F=ma KE = 1/2 mv^2The Attempt at a Solution the blocks have the same kinetic energy
  34. D

    Two Blocks with rope and Pulley on Inclined Plane

    Homework Statement This is a problem that I am trying to help my friend with. I understand how to solve this problem the traditional way by rotating the axes of the block on the inclined plane, but then my friend asked me to show him how the answer is the same with non-rotated axes. There...
  35. L

    Acceleration and tension for two blocks connected to frictionless pulley

    I have tried to get this problem many different ways but still don't get it. A 1.00 kg aluminum block and a 8.00 kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle θ = 40.0°) as shown in Figure...
  36. N

    Two blocks and a pulley, friction

    Homework Statement Two masses are connected by a string which passes over a frictionless, massless pulley. One mass hangs vertically and one slides on a horizontal surface. The horizontal surface has a coefficient of kinetic friction 0.2. The vertically hanging mass is 4.0 kg and the mass on...
  37. C

    What is the tension in the string?

    forces act on blocks A and B, which are connected by a string. Force FA = (15 N) i acts on block A, with mass 5.0 kg. Force FB = (24 N) i acts on block B, with mass 6.0 kg. What is the tension in the string? Fa Fb -> -> [A]---[B]--> F=ma (15N+24N)=(5.0kg+6.0kg)(a)...
  38. P

    Two blocks and a spring and Free Body Diagrams

    Homework Statement 20: Two boxes are sitting on top of one another. The top box has a mass of 5kg and is connected to the wall by an unstretched spring, k=2000N/m. The bottom box is 10kg. the static friction coefficient between the 2 boxes is 0.5, the kinetic friction coefficient between the...
  39. S

    What is the Tension in a Two-Block System?

    Whoops, I know i made another post but i didnt realize i have another question that i left blank: The weight of the block on a table is 452 N and that of the hanging block is 220 N. Ignore all frictional effects, and assuming the pulley to be massless. What is Acceleration of the two...
  40. P

    Two Blocks and Pulley (Rotational Statics & Dynamics)

    Here's the problem: http://img187.imageshack.us/img187/5958/showmenq5.gif A block of mass m1 = 1 kg rests on a table with which it has a coefficient of friction µ = 0.52. A string attached to the block passes over a pulley to a block of mass m3 = 3 kg. The pulley is a uniform disk of mass...
  41. H

    Two blocks - one on a table and one hanging - acceleration with friction

    [SOLVED] Two blocks - one on a table and one hanging - acceleration with friction Homework Statement h ttp://bildr.no/view/186531 that's a link to an image of the problem Block A (mass 2.25kg) rests on a table top, it is connected by a horizontal cord passing over a light , frictionless...
  42. N

    Solving Pushing Two Blocks Kinetic Energy

    Homework Statement There are two blocks touching each other, block A, and block B. Block A is being pushed by a force, which in turn moves block A and B at the same time. Block A has a mass of 4kg, block B has a mass of 1kg. (so the force is pushing the larger block, which is pushing the...
  43. I

    Conservation of energy of two blocks

    [SOLVED] conservation of energy Homework Statement Two blocks, of masses M = 1.9 kg and 2M are connected to a spring of spring constant k = 220 N/m that has one end fixed, as shown in the figure below. The horizontal surface and the pulley are frictionless, and the pulley has negligible mass...
  44. M

    Work and kinetic energy of two blocks

    Homework Statement Two blocks of mass m1 and m2 (m1 > m2) slide on a frictionless floor and have the same kinetic energy when they hit a long rough stretch (coeff. of kinetic friction > 0), which slows them down to a stop. Which one goes farther? Homework Equations W = Fd..iono...
  45. A

    Two blocks with different mass

    Two blocks with different mass are attached to either end of a light rope that passes over a light, frictionless pulley that is suspended from the ceiling. The masses are released from rest, and the more massive one starts to descend. After this block has descended a distance 1.40 , its speed is...
  46. B

    Forces Acting On Two Blocks : mostly conceptual

    Homework Statement Block A is on top of Block B, which is on a frictionless incline. The mass of Block A is less than that of Block B. The positive x-direction is defined to be up the ramp. During the interval from t1 to t2 a hand exerts a constant force on block A in the positive...
  47. K

    What Is the Mass of the More Massive Block?

    Homework Statement Two blocks with different mass are attached to either end of a light rope that passes over a light, frictionless pulley that is suspended from the ceiling. The masses are released from rest, and the more massive one starts to descend. After this block has descended a...
  48. A

    Find the Contact Force Between Two Blocks

    Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.51kg, M2 = 3.96kg, and F = 4.55N, find the size of the contact force between the two blocks. So first I found the acceleration (F=ma) 4.55/(1.51+3.96) = 0.83 = acceleration Im...
  49. S

    Two Blocks on an Incline: Solving for Acceleration and Tension

    SOLVED :) Homework Statement https://tycho-s.phys.washington.edu/cgi/courses/shell/common/showme.pl?courses/phys114/winter08/homework/04d/2blocks_incline_NWT/5.gif The figure shows two identical blocks tied together with a string which passes over a pulley at the crest of the inclined...
  50. S

    Calculating Tension and Acceleration in a Two-Pulley System

    Hope someone can help me with this one. I have two blocks with m1 and m2 connected to two pulleys. I need to figure out T1, T2, a1, and a2 using only the values of g, m1, and m2. But I've been unable to come up with an equation that will work with it. I have a picture attached. I tried using...
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