Frictionless Definition and 475 Threads

Homework Statement A frictionless ramp of mass 3m is initially at rest on a horizontal frictionless floor. A small box of mass m is placed at the top of the ramp and then released from rest. After the box is released, it slides down the ramp and onto the horizontal floor, where it is...

So I was helping my girlfriend with this problem and we are convinced we are correct, but her professor disagrees. So I am taking it to PF court :smile: Homework Statement In the figure, all 3 blocks have the same mass. A force pulls the system along the frictionless floor and the 3...

1. A spring with a spring-constant 3.6 N/cm is compressed 39 cm and released. The 9 kg mass skids down the frictional incline of height 36 cm and inclined at a 20◦ angle. The acceleration of gravity is 9.8 m/s^2. The path is frictionless except for a distance of 0.6 m along the incline which...

Homework Statement A 100kg crate is pushed at a constant speed up a frictionless 30 degree inclined ramp. What constant horizontal force is required? what force is exerted on the crate by the ramp? Homework Equations Fg parallel= mgsin(theta), Fg Perpindicular=mgcos(theta), Constant...

Homework Statement The question I'm working on says "A special, frictionless, thin meter stick is initially standing vertically on the floor. If the meter stick falls over, with what angular velocity will it hit the floor?" Homework Equations v_rot=rw, I=1/12mL^2, KE=1/2Iw^2 The...

Homework Statement There is no friction Part A) Find the mass of block C so that block B moves up the incline with a constant speed Part B) fint he mass of block C so that Block B moves up the incline with a constant accleration a = g/2 Homework Equations The Attempt at a...

Frictionless incline plane homework help! Homework Statement An object is on a frictionless inclined plane. The plane is inclined at an angle of 78.0 degrees with the horizontal. Using the accerlation due gravity from your reference table. What is the magnitude of object's acceleration...

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...

Homework Statement Three blocks on a frictionless surface are connected by massless strings, with M1 = 1.10 kg, M2 = 2.40 kg, and M3 = 3.60 kg. Due to the force F acting on M3, as shown, the system accelerates to the right. Given that T1 is 2.10 N, calculate T2 Homework Equations...

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...

Homework Statement A block of mass 3.7 kg on a frictionless plane inclined at an angle of 30 degrees is connected by a cord over a massless, frictionless pulley to a second block of mass 2.3 kg. What are the acceleration of the blocks? The direction of acceleration of the hanging block and...

I have the solution to the problem but I don't get the part how you rotate the axes and then solve from there. For example in the x direction Fx = max +mg sin32 = max Fx = Force in x direction ax = acceleration in the x direction Can someone explain this?

Homework Statement In the figure, a crate of mass m = 111 kg is pushed at a constant speed up a frictionless ramp (θ = 30°) by a horizontal force F . The positive direction of an x-axis is up the ramp, and the positive direction of a y-axis is perpendicular to the ramp. (a) What is the...

Homework Statement In the figure, a crate of mass m = 111 kg is pushed at a constant speed up a frictionless ramp (θ = 30°) by a horizontal force F . The positive direction of an x-axis is up the ramp, and the positive direction of a y-axis is perpendicular to the ramp. (a) What is the...

Homework Statement Two people are trying to climb an iced-over mountain. They are connected by a rope which passes smoothly over a rock where the terrain bends (acting as a pulley). One climber (110kg) is on top on a horizontal surface while the other (125kg) is on a 22.56 degree incline...

Acceleration down a frictionless ramp- what does ay represen in this case? I wish I could upload a picture or something, but I don't have a scanner! I'm looking at an object moving down a frictionless ramp; the main acceleration vector points straight down, ax of course is parallel to the...

Homework Statement An 8.00m uniform ladder whose mass is 55 kg is resting against a frictionless wall. Its lower end is 750cm from the wall. If the coefficient of static friction between the floor and the lower end of the ladder is 0.60, calculate the reactions on both side of the ladder...

Homework Statement Somehow Larry got stuck in the middle of a room with a frictionless floor. Larry is at rest. How could Larry start moving to get to the edge of the room? A. Push on the floor with his hands or feet. That way the floor could exert a force on him and Larry could...

Homework Statement Three blocks on a frictionless horizontal surface are in contact with each other as shown in Fig. 4-5. A force F is applied to block 1 (mass m1). (a) Draw a free-body diagram for eeach block. Determine (b) the acceleration of the system (in terms of m1, m2, m3), (c) the...

Homework Statement (This is Harris-Benson Chap5 Problem 6, the statement reads: A block of mass m is on a wedge of mass M. All surfaces are frictionless. Suppose the wedge is accelerated towards the right by an external force at 5ms^-2 (=a). What is the acceleration of the block relative to the...

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...

Homework Statement Three blocks are in contact with each other on a frictionless horizontal surface as shown. The masses of the blocks are m1 = 1.0 kg, m2 = 2.0 kg, and m3 = 3.0 kg. A horizontal force F = 24 N is applied to m1. a. Find the acceleration of the three blocks. b. Find the...

Homework Statement What is the magnitude of force F (which is pushing from the left on M) required to keep M1 and M2 relatively at rest to M? Ignore all friction. See attached diagram Homework Equations Newton's laws The Attempt at a Solution Well...If M is at rest, M1...

Homework Statement Does a perfect ball roll or slide down a perfectly frictionless ramp? Homework Equations The Attempt at a Solution Let P be the contact point of the ball with the ramp. Then it appears to me there is a torque (about the contact point, P) acting on the ball due...

Homework Statement A car of mass M = 1200 kg traveling at 40.0 km/hour enters a banked turn covered with ice. The road is banked at an angle theta, and there is no friction between the road and the car's tires. What is the radius r of the turn if \theta = 20.0 degrees (assuming the car...

Homework Statement A 45 degree wedge is pushed along a table with constant acceleration A. A block of mass m slides without friction on the wedge. Find its acceleration. Homework Equations The Attempt at a Solution I quick sketched up the problem in the attached picture. It...

Homework Statement Blocks with masses of 0.54 kg, 2.16 kg, and 2.87 kg are lined up in a row on a frictionless table. All three are pushed forward by a 13.8 N force applied to the 1 kg block. How much force does the 2.16 kg block exert on the 2.87 kg block? Homework Equations...

Need Help ! Homework Statement Two bodies, A and B arrive at the base of a fricitonless inclined plane with equla momenta of magnitude p. mb=3ma. The ratio of the max. distance Db that B travels up the plane to the max. distance Da the A travels up the plane is : Db=Da ? is that correct ...

Penny sits on top of a frictionless sphere, urgent please Homework Statement At the top of a frictionless sphere of radius R a penny is given a push to speed x. At what angle, measured from the vertical does the penny leave the surface?

Homework Statement Consider a block of mass M that is pulled up an incline by a force T that is parallel to the surface of the incline. The block starts from rest and is pulled a distance x by the force T. The incline, which is frictionless, makes an angle theta with respect to the...

Homework Statement Two boxes are resting on frictionless ramps. Box 1 is lighter and sits on a steep ramp while Box 2 is heavier and sits on ramp that is less steep. The boxes are released from the same point. Which box (if either) has a) The greater speed? b) The greater kinetic energy...

1. a block is pushed up a 35 degree incline (no friction) by an applied force. If F= 20N and m= 2.0kg, what is the magnitude of the resulting acceleration of the block? 2. not sure? f=ma 3. don't know where to start. It has been a long time since physics

Homework Statement a box of mass m2 = 1.2 kg on a frictionless plane inclined at angle θ = 26°. It is connected by a cord of negligible mass to a box of mass m1 = 3.3 kg on a horizontal frictionless surface. The pulley is frictionless and massless. (a) If the magnitude of the horizontal force...

Homework Statement A box of unknown mass slides across a frictionless floor with an initial speed of 4.7 m/s. It encounters a rough region where the coefficient of friction is µk = 0.3 Part 1: What is the shortest length of rough floor which will stop the box? Part 2: What is the shortest...

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...

A child and sled with a combined mass of 53.8 kg slide down a frictionless hill that is 8.56 m high. If the sled starts from rest, what is its speed at the bottom of the hill? m/sim not sure how to calculate speed given the information. help please?

Homework Statement A child slides down a frictionless 3.1 -long playground slide tilted upward at an angle of 37. At the end of the slide, there is an additional section that curves so that the child is launched off the end of the slide horizontally. Part A How fast is the child moving at...

Homework Statement A 3 kg block is held against a spring (k=580nt/m) at the bottom of a frictionless 25 degree incline. The spring is compressed 0.18m. How far along the incline does the block go when released.Homework Equations Usp=1/2kx^2 The Attempt at a Solution So far the only thing I've...

Homework Statement A particle of mass m is moving on a frictionless horizontal table, attached to a massless string, the other end of which passes through a hole in the table. It was rotating with angular velocity \omega_0, at a distance r_0 from the hole. Assuming that I pull the string so...

Hey, I am new but was trying to find help online and found this site...hopefully someone will be willing to help me. I used to be really good at mech but I've gone blank and my exams wed and i was wondering if someone could just help we with where to start even if they don't know the ans it...

Spring Energy--a block slides down a frictionless incline plane A block of mass m = 13 kg is released from rest on a frictionless incline angled of angle θ = 30°. Below the block is a spring that can be compressed 2.0 cm by a force of 270 N. The block momentarily stops when it compresses the...

Some of you are familiar with the US FIRST Robotics organization, a program that introduces robotics to high school students. This years game/task involves playing on a surface that is VERY SLIPPERY, intended to effectively simulate "floating" in 1/6th Earth's gravity as if the robot was on the...

Homework Statement A block of mass, m, sits atop a semicircular bowl of radius, r, and the angle the radius makes with the horizontal is \theta. Find what angle, \theta, the block will slide off the bowl.Homework Equations \frac{1}{2}mv^2 + mgy = \frac{1}{2}mv^2 + mgy \alpha=ar...

A frictionless cylindrical flywheel, of diameter 250mm and mass 30kg, has a string attached/wrapped on the outside diameter, with a mass of 10kg on the other end. What is the radius of gyration of the flywheel? If the mass starts 1.5m form the floor, what will its speed be when the mass is...

A uniform disk is lying on a flat, frictionless surface, and a force is applied as shown: http://www.freeimagehosting.net/uploads/ae622047b5.jpg What will be the motion of the disk.. more importantly, the motion of center of mass of the disk. will it move in a straight line, or will it move...

Homework Statement Two air hocky pucks collide head-on elastically on a frictionless surface. The smaller puck has a mass of 0.050 kg and is moving to the right at 5.0 m/s while the larger puck has a mass of 0.10 kg and is moving to the left with a speed of 2.0 m/s. Find the velocity of each...

Homework Statement It seems simple, doesn't it? A bead starts from (0,1/2) and simply slides down the parabola y=(1/2)(x-1)[SUP]2 under gravity. The problem is to get its position rel. to origin in terms of time, ie. r = [x(t),y(t)]. Anyone into this? Homework Equations y' = x-1 = tan...

Homework Statement A ladder is sitting on a frictionless surface as shown in the figure. Each half has a mass m=20 kg and has a length L=1.5 m, and the angle that each side of the ladder makes with the vertical is alpha=20 degrees. A person of mass M=119 kg is standing at a distance x=0.026...

Homework Statement An ideal spring of an un-stretched length 0.10 m is placed horizontally on a frictionless table. One end of the spring is fixed and the other end is attached to block of mass M = 10 kg. The 10 kg block is also attached to a massless string that passes over a small...

I have posted this question before but have not got a complete answer. I have since been thinking about it quite often, yet still have not had a conclusive answer. I'd really appreciate if someone can give a full explanation, since it is a fact known by most. 1. Under all ordinary conditions...