# What is Frictionless pulley: Definition and 39 Discussions

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1. ### Using the sin function for a problem with a frictionless pulley and an incline

To find the tension in the rope connecting 6.0 kg block and 4.0 kg block we do 6.0 kg = m1, 4.0 kg = m2, 9.0 kg = M (m_2 + m_1)a - Ma = Mg - m_2 gsin\theta - m_1 gsin\theta Why do we use sin in these equations and not cos?
2. ### Oscillating Spring in a Frictionless pulley system

1. Draw Free body Diagram for each weight. 2. Solve for Tension in Rope. 3. Find Spring Constant. 4. Find omega (w, or angular velocity)
3. M

### A system comprising blocks, a light frictionless pulley, and

Homework Statement A system comprising blocks, a light frictionless pulley, and connecting ropes is shown. The 9-kg block is on a smooth horizontal table (μ = 0). The surfaces of the 12-kg block are rough, with μ = 0.30. In Fig. 5.7, the mass M is set so that it descends at constant velocity...
4. ### Finding the spring constant of a spring in a pulley system

Homework Statement Ok so here is the prompt: a 3kg object is fastened to a light spring over a pulley. The pulley is frictionless and its inertia may be neglected. The object is released from rest when the spring is unstretched. If the object drops 0.1 meters before stopping, find the spring...
5. ### A person and a box of equal mass are on a pulley with v=0....

Homework Statement person and a box of equal masses are hanging off of the same pulley. The rope is considered massless. The person and the box are separate from each other. (The person is NOT standing on the box.) Homework Equations How far does the box move if the person starts climbing...
6. ### Mechanical energy of frictionless pulley

Homework Statement In the system shown, the block M (mass of 15.65 kg) is initially moving to the left with a speed of 3.4 m/s The mass of m is 8.26 kg and the coefficients of friction are μs=0.411 and μk=0.304. The string is massless and the pulley is massless and frictionless. How fast will M...
7. ### System in static equilibrium given a nudge. What happens?

We're given a problem: A 2.0 kg mass hangs from a rope attached to an unknown mass m on a frictionless ramp inclined at 20 degrees above the horizontal. This is drawn as a diagram which shows the incline at 20 degrees where the hanging mass is 2.0 kg and the attatched mass on the frictionless...
8. ### Two masses hanging from a pulley (conservation of energy)

Homework Statement Two masses are connected by a string that hangs over a frictionless pulley with mass 8kg, radius .25m, and moment of inertia .5mr^2. One mass lays on the ground and has mass 15kg. The other mass is 22.5 kg and is 2.75 m above the ground. Use conservation of energy to...
9. ### Changing masses on an atwood machine

An example of this kind of a problem would be a frictionless, massless pulley holding two equal masses(say, 5kg each). But then, an additional mass is added to one side (ie, a frog jumping on to mass 1, 1 kg). What would happen to the system? What if the frog jumps off?Initially, I know that the...
10. ### Velocity of two identical masses over a frictionless pulley

Homework Statement "Consider the following arrangement of masses. Mass 1 is connected to mass 2 by a very light string and moves over a frictionless pulley so that both masses move with the same speed and move the same distances (m2 to the right and m1 down). Assume m1 = 15 kg, m2 = 15 kg and...
11. ### Two masses on inclined plane with frictionless pulley

Homework Statement A 1.00-kg aluminum block and a 4.00-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 31.0°). The aluminum block is on the left side, on a flat plane. On the right is the...
12. ### Two blocks and a mass- and frictionless pulley

The problem and solutions: http://i.imgur.com/hxlfbmZ.png I was able to solve the first two questions, but I guessed part C. For the first one, I thought of the two blocks as one unit (since there's no friction or air resistance). If they're both falling with the same acceleration, there...
13. ### Massless and Frictionless Pulley

Can a massless and frictionless pulley rotate if a string goes over it connecting two blocks of unequal weight? I think it shouldn't rotate and the string just skids/slides over the top of the pulley. Is it correct?
14. ### A friction problem containing a frictionless pulley

Homework Statement Two masses are connected by an inelastic string over a frictionless pulley. M1 is 4 kg and the coefficient of static friction between M1 and the inclined plane Us = 0.25. What minimum and maximum amount of mass can M2 have so that M1 remains stationary on the plane? (In the...
15. ### Frictionless pulley system: same tension changing masses

Homework Statement An astronaut lands on a distant planet with an unknown gravitational field g’. On the bottom of his spaceship, he attaches an ideal frictionless pulley supported overhead with two light buckets hanging downwards, attached by a light rope. He places 24 kg of the same rock...
16. ### Magnitude and direction of tension in a suspended and frictionless pulley

[PLAIN]http://www.tumblr.com/photo/1280/12942474909/1/tumblr_lutva4tbpB1qml28n
17. ### Two masses, frictionless pulley

Homework Statement Two masses are connected by a light string that goes over a light, frictionless pulley, as shown in the figure. The 8.7-kg mass m1 is released and falls through a vertical distance of h = 1.09 m before hitting the ground. Use conservation of mechanical energy to determine...
18. ### Finding W1 & W2 Given Frictionless Pulley System

In the figure shown the pulley are frictionless and the system hangs at equilibrium. If w3, the weight of the object on the right is 200N, what are the values of w1 and w2? http://img228.imageshack.us/i/74717268.png/ http://img228.imageshack.us/img228/2605/74717268.th.png Uploaded with...
19. ### Exploring the Impact of a Frictionless Pulley on Acceleration

Pretend there are two accelerating masses connected to a massless string with a frictionless pulley between them. How can the frictionless pulley (Rotational inertia and radius given) affect acceleration in any sort of way? Also, why is the net force equal to Acceleration * (Mass of two...
20. ### Solving a Frictionless Pulley Problem: Find m2's Acceleration

hi can some one please help me with this for an exam? A 33.5 kg block (m1) is on a horizontal surface, connected to a 7.10 kg block (m2) by a massless string. The frictionless pulley has a radius R = 0.081 m and a moment of inertia I=0.110 kgm2. A force F = 244.9 N acts on m1 at an angle θ...
21. ### Solving Frictionless Pulley System: Acceleration & Tension Force

Homework Statement Two masses are places in a frictionless pulley system. Solve for the acceleration and tension force. )its a pullz question and the mu=0.1 Homework Equations So i know that Fg=MG Fnet=ma Ff=MFn How can i solve this question? how come Fnet=Ft came out of nowhere...
22. ### Solving a Frictionless Pulley Problem: Acceleration of m2

Homework Statement A 29.3 kg block, m1, is on a horizontal surface, connected to a 6.70 kg block, m2, by a massless string as shown. The frictionless pulley has a radius R = 0.055 m and a moment of inertia I = 0.100 kg·m2. A force F = 202.5 N acts on m1 at an angle θ = 29.7°. There is no...
23. ### Net torque for a frictionless pulley

Homework Statement A light rope passes over a light frictionless pulley. One end is fastened to a bunch of bananas of mass m, and a monkey of mass m clings to the other end of the rope. The monkey climbs the rope in an attempt to reach the bananas. (a) Treating the system as consisting of the...
24. ### Two Objects, Acceleration is Given, Find Tension of rope on frictionless pulley

Picture has two objects, one on top of the other - the bottom object has a mass of 8 kg. The top object has a mass of 4 kg. The coefficient of friction between bottom object and floor is 0.3. The coefficient of friction between the two objects is 0.2. Acceleration is 4 m/s2. A rope is on a...
25. ### How Does Tension Affect Motion in Atwood's Machine?

Homework Statement Atwood's Machine. A load of bricks with mass m_1 = 15.0 kg hangs from one end of a rope that passes over a small, frictionless pulley. A counterweight of mass m_2 = 28.0 kg is suspended from the other end of the rope, as shown in the figure. The system is released from...
26. ### Help with 3 objects/masses connected by string over frictionless pulley?

Homework Statement Three masses connected by light strings are shown in the figure below (I will try my best in describing the figure): There is light, frictionless pulley with two masses, M2 and M3, on the left and one mass, M1, on the right. They are all connected by light strings. Given...
27. ### Frictionless Pulley with two weights

Firstly, nice forum! Secondly, I am Swedish but I will try to use the correct scientific terms in explaining the problem and my proposed solution. Homework Statement There is a string of negligible mass which "hangs" over a pulley attached to a frictionless horizontal axis. On each end of...
28. ### 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...
29. ### Frictionless Pulley: m1 = M2 * a/g Steel Ball Bearing: d = v*t + (1/2)*a*t^2

There are actually 2 questions that i have Homework Statement First is a frictionless pulley with zero mass is attached to the ceiling, in a gravity field of 9.80 m/s2. Mass M2=0.250 kg is being accelerated downward with a=1.40m/s2. calculate the mass m1. Second is A small steel ball...
30. ### Inertia, frictionless pulley, and a weight

Homework Statement A frictionless pulley has the shape of a uniform sold disk of mass 2.5 kg and radius .2m. A 1.5kg stone is attached to a very light wire that is wrapped around the rim of the pulley, and the system is released from rest. (a) How far must the stone fall so that the pulley has...
31. ### Conservation of Energy and frictionless pulley?

Homework Statement A 20.0 kg block is connected to a 30.0 kg block by a string that passes over a light, frictionless pulley. The 30.0 kg block is connected to a spring that has negligible mass and a force constant of 240 N/m, as shown in the figure below. The spring is unstretched when the...
32. ### Calculating Tensions and Acceleration in Frictionless Pulley System

The weights of the objects are 200 N and 300 N. The pulleys are essentially frictionless and massless. P1 has a stationary axle but P2 is free to move up and down. Find the tensions FT1 and FT2 and the acceleration of each body. Diagram I made in paint attached. Now my problem is not that...
33. ### Tension in a rope on frictionless pulley

Homework Statement A 4kg object is palced on a table with a coefficient of friction of 0.2, and attached to a rope. This rope is run through a frictionless pulley, and attached to an 8kg weight. What is the tension in the rope? Homework Equations F=ma F of friction = (coefficient of...
34. ### Frictionless pulley and static equilibrium

Homework Statement Two masses are connected by a string passing over a frictionless pulley. show that for this system to remain in static equilibrium where m1 sin O (theta) > m2 that (static friction coefficient) > or = tan O - m2 / m1 sec O. Homework Equations static friction...
35. ### What is the work done on the bucket in a frictionless pulley problem?

An old oaken bucket of mass 6.75 kg hangs in a well at the end of a rope. The rope passes over a frictionless pulley at the top of the well, and you pull horizontally on the end of the rope to raise the bucket slowly a distance of 4.00 m. How much work do you do on the bucket in pulling it up?
36. ### Frictionless pulley Forces Problem

Hi there, I'm new to this forum but I'm very interested in maths and physics. I look forward to learning from the people here and hear some of your insights. Today I have a question involving forces. I've finished the problem and I was just wondering if anyone here may please check if it is...
37. ### What is the tension in the string for a frictionless pulley-incline system?

Two packing crates of masses m1 = 10.0 kg and m2 = 7.00 kg are connected by a light string that passes over a frictionless pulley. The 7.00 kg crate lies on a smooth incline of angle 43.0°. Find the acceleration of the 7.00 kg crate up the incline. Find the tension in the string. I found the...
38. ### How Do You Solve a Frictionless Pulley System with Unequal Masses?

I'm trying to help a friend with this problem and we are both very stuck. I wanted to ask for help here for him. -------A 1.0 kg tin of anti-oxidants on a frictionless inclined surface is connected to a 2.0 kg tin of corned beef. The pulley is massless and frictionless. An upward force F r...
39. ### A massless, frictionless pulley is suspended from a rigid rod

A massless, frictionless pulley is suspended from a rigid rod. Two masses, m (50 kg) and M (60 kg), are suspended on either side of the pulley, respectively, by a light, inextendable cord. Determine the accelerations of the masses. I drew the force diagrams of both; there is an upward...