Frictionless Definition and 475 Threads

Homework Statement Will a frictionless body placed on the Earth move, and if so, describe it's path and acceleration. Homework Equations I was given no equations, but I believe that coriolis and centripetal forces would act on the body.The Attempt at a Solution I assume that we have to assume...

Homework Statement A mass ##m_1## is attached to a second mass ##m_2 > m_1## by an Acme (massless, unstretchable) string. ##m_1## sits on a frictionless inclined plane at an angle ##\theta## with the horizontal; ##m_2## is hanging over the high end of the plane, suspended by the taut string...

Homework Statement A small object with mass m is dragged without friction to the highest point of a semicircle with a radius of R, by a weightless rope. a) If the magnitude of his velocity is constant, then his acceleration that is parallel to the semicircle, is zero. Prove that F = mgcosθ...

Homework Statement A 60 kg farmer ropes a 300 kg ox. Both are initially at rest, 24 m apart on a frictionless level surface. When farmer ends up pulling the ox towards him, the ox will move A) 4m, B) 5m, C) 12m, D) 20m, E) 24m . Can anyone help me solve this? Homework EquationsThe Attempt at...

Homework Statement In the figure provided, two suitcases are on a 6.36 m high ramp to passengers waiting in a baggage terminal. The top suitcase is released from rest, and it slides down the ramp and hits the second suitcase. If the suitcase at the top has a mass of 11.8 kg and the other...

Homework Statement A 259 g textbook slides up a 22.1° incline that is 2.55 m long. Using conservation of energy and assuming the incline is frictionless, what minimum initial speed is needed to accomplish this? mass = 0.259 kg Θ = 22.1° length of incline = 2.55 m Homework Equations KE =...

Homework Statement Homework EquationsThe Attempt at a Solution [/B] I'm having trouble visualizing what is going on in this problem. I imagine that the box is in a position like this with a spring on each end of the box. Then a force F is applied that compresses the springs. What I'm...

Homework Statement A rope of mass M and length ##l## lies on a frictionless table, with a short portion ##l_0##, hanging through a hole. Initially the rope is at rest. Find the length of the rope through the hole as a function of time. Homework EquationsThe Attempt at a Solution So I know...

Homework Statement This problem involves solving a simple differential equation. A block of mass ##m## slides on a frictionless table. It is constrained to move inside a ring of radius ##l## that is fixed to the table. At t = 0, the block is moving along the inside of the ring (in the...

Homework Statement A lumberjack (mass = 111 kg) is standing at rest on one end of a floating log (mass = 259 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.93 m/s relative to the shore, and then hops onto an identical floating log that is...

Hi all, In the attached photo, you can find a plate supported along the edge by "frictionless" support and I am trying to obtain the stiffness matrix using the node at the center. I wonder why the Kxx and Kyy (highlighted) are not equivalent or even near to each other, any suggestions?

Homework Statement An object is on a frictionless inclined plane. The plane is at an angle of 30 degrees with the horizontal. What is the object's acceleration? a) 0.50g b) 0.56g c)0.68g d)1.0g e)0.87g Homework Equations F=ma a = g.sin(theta) The Attempt at a Solution I set it up where...

Homework Statement For problems 102 and 103, find the value of Mc required to maintain equilibrium, and find the forces at C. Ma is given as 20 Nm for both problems. [/B]Homework Equations Start with AB. The geometry is a 3/4/5 triangle, so AB is 100mm or 0.1 M. So 20NM=0.1B B=20/0.1 or...

One end of a thin, uniform rod is connected to a frictionless hinge as shown in Figure 1. The rod has a length of 0.8 mand a mass of 2 kg. It is held up in the horizontal position (θ=90∘) and then released. 1)Calculate the angular velocity of the rod at θ=90∘. 2)Calculate the angular...

Homework Statement A body moves down along an inclined plane from A(top) to B(bottom), and then moves on the floor in continuation to some point C. (All surfaces are frictionless) After reaching B, body is having some acceleration. But while moving from B to C, a) will it keep on...

Homework Statement Two blocks, A and B , are being pushed on a frictionless surface by a froce of 30 N to the right, .Block A has a mass of 2.0kg, Block B, being pushed by Block A is 4.0kg. Calculate the magnitude of the force that block B exerts on Block A. Homework Equations f=ma The...

Homework Statement A rope with uniform density ##\lambda=\frac{m}{L}## is placed on a frictionless table with an initial length ##y_0## hanging through the hole. Derive a differential equation for the position of the bottom of the rope and then using this solve for the time required for the...

Homework Statement "A 68 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 15° above the horizontal. (a) If the coefficient of static friction is 0.50, what minimum force magnitude is required from the rope to start the crate moving? (b) If μk = 0.35...

Homework Statement This question was posed on a recent test I had to write. Our professor does not let us keep our graded tests nor does she share solutions, so all I have is the problem statement. I've made an effort to recreate the solution I had, but I got it wrong in any case and I'd like...

Hi, Could you please help me determine if I've worked this problem out correctly. 1. Homework Statement A 2.86-kg object on a frictionless horizontal surface oscillates at the end of a spring with an amplitude of 7.81 cm. Its maximum acceleration is 3.74 m/s2. Calculate the total...

Homework Statement System is in equilibrium. 1 mass known: 79.4 kg (or 778.6 N) and 2 other unknown. Other masses unaccounted for. Everything friction-less. The Tensions are unknown also. Homework Equations ∑F = 0 ∑Fx = -T1*cos135 + -T3*cos37 = 0 ∑Fy = (-T1*sin135 - m1g) + (-T3*sin37 -...

Homework Statement I have an object of 10 kg It is to be displaced 2 meters Assume a frictionless surface, and no wind resistance The object begins as stationary, then is moved that distance in the span of .5 seconds. Homework Equations Force = mass* acceleration acceleration = (delta...

Homework Statement Attached Homework Equations kinetic energy = (1/2) m v^2 potential energy = mgh The Attempt at a Solution Did I do this correctly, At the top, kinetic energy is 0 since it starts at rest. At the bottom we choose the potential to be zero So using conservation, mgz=...

Homework Statement Consider a massless rod of length $L$ with a small mass $m1$ attached on one end, and $m2$ attached on the other end. The rod is initially in the vertical position at rest on a frictionless surface, with $m1$ on bottom and $m2$ on top. A small impulse is applied to the top...

Homework Statement Consider a frictionless track as shown (I will attach an image in a follow up post). A block of mass M1= 5.00 kg is released from point A. It makes a head-on elastic collision at B with a block of mass m2 = 10 kg that is initially at rest. Calculate the maximum height to...

Homework Statement A skier of mass 70 kg is pulled up a slope by a motor-drive cable. a. How much work is required to pull him 60 m up a 30° slope (assumed frictionless) at a constant speed of 2 m/s? b. What power must a motor have to perform this task? Help would be greatly appreciated...

Homework Statement New to physics forum, so please forgive me if I am posting this in the wrong place, but it seems to me that this is a homework-type or basic physics question. Here it is: You have a perfect cube with substantial mass sitting on a flat frictionless surface. The surface plane...

Homework Statement A child stands on frictionless ice and throws a snowball. Estimate the recoil velocity of the child. Homework Equations m1v1i + m2v2i =m1v1 +m2v2f 1/2mv21i + 1/2 mv22i = 1/2 mv21f + 1/2mv22f The Attempt at a Solution After choosing estimates for weight of snowball, speed of...

Homework Statement A particle (of mass m) is free to move along a frictionless curve y(x) which is rotating about the y-axis at a constant angular speed ω. A uniform gravitational field (of strength g) acts along the negative y direction. Find the equation of motion of the particle. (That's...

I've been a fan of this forum for a while, but never signed up for it, today I'm stuck on this problem and can't find anywhere other than Chegg but I don't have a premium account. 1. Homework Statement A meter stick is at rest on frictionless surface. A hockey puck is going towards the 30cm...

I'm trying to figure out the effective strain of a frictionless punch on a deep plate. For simplicity's sake let's say it's in plane strain. Don't quite know where to start. Closest thing I can think of is the strain from a bulge test, but that involves a thin sheet. Looked at some indentor...

The Question: Using a simply pulley/rope system, a crewman on an Arctic expedition is trying to lower a 5.65-kg crate to the bottom of a steep ravine of height 23.9 meters. The 60.9-kg crewman is walking along holding the rope, being careful to lower the crate at a constant speed of 1.50 m/s...

Homework Statement [/B] This is not a typical homework problem, so I hope I am posting this in the correct place. I am in 12th grade physics and we are dealing with basic kinematics. However, we recently did a set of problems that I did in a way which makes sense and which our textbook (and the...

Homework Statement A particle of mass m rests atop a frictionless hemisphere of radius R. A force F = -mkyα acts in the y direction. After an initial small displacement, the particle slides down the sphere under the action of the force. Find a) the height above the equator and b) the speed of...

Homework Statement The double Atwood machine has frictionless, massless pulleys and cords. Determine (a) the acceleration of masses ma, mb, and mc, and (b) the tensions Fta and Ftc in the cords. Homework Equations F=ma The Attempt at a Solution So I drew free body diagrams for the mass A...

I was looking at a problem: http://gyazo.com/c872ea999197823a42568809f9d97d3f and I understood that the reason that the force would have to be greater on a surface with friction because the equation for the force of friction is dependent on mass (μk * mg) and with two masses it essentially...

Homework Statement A 2 kg frictionless cart with a velocity of 6 m/s hits a wall and rebounds with a velocity of 4 m/s. What is the impulse on the cart by the wall? Is momentum conserved? Homework Equations J = Δp The Attempt at a Solution J = Δp = pf-pi = mvf-mvi = 2kg (-4m/s -6m/s) = -20...

So this sounds homework question but I promise its not. At least its not mine. I saw it on a website because someone made it funny because of what they answered (drew an elephant if you know the one I'm talking about) Anyway, so the problem was a block of mass m = 5 kg falls starting at rest at...

Homework Statement A girl of the mass 30kg and a boy of the mass 45kg sit on a frictionless floor holding two ends of a rope. The boy pulls on the rope. The girl moves towards the boy with an initial acceleration of 3ms^-2. The boy A. Moves towards the girl with an initial greater acceleration...

Homework Statement [/B]In the drawing, the rope and the pulleys are massless, and there is no friction. Find (a) the tension in the rope and (b) the acceleration of the 10.0-kg block. (Hint: The larger mass moves twice as far as the smaller mass.) 2. Formula's Used. F = ma, W = Mg. The...

< Mentor Note -- thread moved to HH from the technical physics forums, so no HH Template is shown > I have read every post I've found on here about this subject, but for some reason the answer is elusive - I suspect due to an issue with units. Here's the problem. vInitial = 0 meters / sec Mass...

If a car falling from H rides downhill to h and then uphill back to H on a frictionless road and the hills all reach the same altitude H , in theory it can cover any distance, without an engine, right? Of course there shouldn't be sharp curves, something like this...

Homework Statement Two students sit on opposite ends of a sled 6 m long initially at rest on frictionless ice. Each student has a mass of 50 kg; the sled’s mass is 40 kg. The student at one end slides a 2-kg object on the sled across to the other at a uniform speed of 5 m/s relative to the sled...

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...

Homework Statement This Problem involves solving a simple Diff. Eq. A block of mass m slides on a frictionless table. It is constrained to move inside a ring of radius L that is fixed to the table. At t=0 the block is moving along the inside of the ring (In the tangential direction) with...

Homework Statement A particle slide on the frictionless surface of the interior of a 45 degree cone ##x^2 + y^2 = z^2 ## a) Find the 2D Lagrangian in terms of the vertical coordinate ##z## and an angular coordinate ## \theta ##. b) Find the Hamiltonian ##H##. c) Show that ##p_\theta## and...

Homework Statement Two masses M1 = 6.90 kg and M2 = 3.10 kg are on a frictionless surface, attached by a thin string. A force of 48.1 N pulls on M2 at an angle of 31.3° from the horizontal as shown in the figure. Calculate the tension T in the string. Homework Equations T=ma a=g(m2/(m1+m2))...

Homework Statement I am not asking you to help me solve this, so i won't put in any usefull relevant equations or attempts at a solution. The nature of my problem is more of an understanding this collision - it is more of a thinking thing to process here. The problem goes like this. Ball is...

Homework Statement A small ball of m=1kg at height hp = 8m at point p, is given an initial horizontal speed vp = 10 m/s. It slides over an uneven frictionless surface. What is speed vq of the ball at height hq = 3m at point q? Homework Equations Ui + KEi = Uf + KEf The Attempt at a Solution...

Need help understanding this: http://www.physicsclassroom.com/Physics-Interactives/Newtons-Laws/Force/Force-Exercise-1 This comes with it: http://www.physicsclassroom.com/Physics-Interactives/Newtons-Laws/Force/Force-Interactive For my first trial I placed the values as instructed and got a...