Frictionless Definition and 468 Threads

There is a ball placed on a frictionless slope. As we all know that, since there is no friction, the ball will not rotate. But after drawing a free-body-diagram and decomposing the gravity, we find that the net force mgsinθ has a torque relative to the contacting point with the value of mgsinθR...

Homework Statement I got into a disagreement with a fellow student today. He insisted that it's possible to simplify the system on the right as the system on the left. I agree with him that the difference in potential energy (and, therefore, the kinetic energy) is the same but I insist that...

Homework Statement Imagine that a circular disc is rotating with a frictionless ball on it( ball is not at center of the disc) If we observe the motion of the ball from the rotating frame of reference, then how can we describe its motion? Homework Equations The Attempt at a...

1. A small hockey puck slides without friction over the icy hill shown in the figure and lands 6.2m from the foot of the cliff with no air resistance. What was the speed v0 at the bottom of the hill? There is also a diagram showing the hill. The puck starts at the bottom and travels 15.3m to the...

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...

I'm not taking this course for credit... Hi! Is this a good text after Halliday? I'm trying problem 7.7- a metal bar of mass m slides frictionlessly on 2 conducting rails... perhaps the current is I=integral J dot da, generated by the moving metal bar, velocity v (results in changing reference...

Homework Statement M1 is on a frictionless flat horizontal surface. It is attached to M2 by a string, which hangs freely from the string which passes over a frictionless pulley of negligible mass. Find a general expression for the acceleration of both M1 and M2. Look at your result and...

A child sitting on a sled is pulled by a rope along a frictionless surface. The child and the sled weigh 214 N and the horizontal force on the sled is 53 N. What is the acceleration of child and sled? I am new and in the process of printing and posting the PDF flyer at my local...

Homework Statement A 5.0 kg block is placed near the top of a frictionless ramp, which makes an angle of 30.0o degrees to the horizontal. A distance d = 1.3 m away from the block is an unstretched spring with k = 3000.0 N/m. The block slides down the ramp and compresses the spring. Find the...

Homework Statement A frictionless car on a straight track tipped at 8.21° accelerates at 1.40 m/s². Released from rest and travels through 2 photo gates. First is 18.8cm away from starting position. Second is 14.8 cm from the first one. Whats the velocity as the car passes through each gate...

Two hobos, each of mass $m_{\text{h}}$, are standing at one end of a stationary railroad flatcar with frictionless wheels and mass $m_{\text{fc}}$. Either hobo can run to the other end of the flatcar and jump off with the same speed $u$ (relative to the car). Use conservation of momentum to...

1. a block B is placed on an inclined plane T ( a right triangle). the triangle rests on a flat surface. zero friction is assumed. what is the acceleration of T & B? 2. no angle of the triangle is given so i just added in θ on intuition. my best guess is something along the lines of: 3...

Homework Statement Two blocks of mass m1 and m2 on a ramp with a frictionless surface? PLEASE HELP!? A diagram shows two blocks of mass m1 and m2 on a ramp with a frictionless surface. The blocks are connected by a massless string over a massless frictionless pulley. The ramp makes an angle...

Homework Statement three numbered cubes each of mass m placed in contact on a frictionless horizontal surface. A steady horizontal force P is applied to the end surface of 1st cube. question:will the force on each cube be P/3?

Homework Statement A block of mass 7.18 kg lies on a frictionless horizontal surface. The block is connected by a cord passing over a pulley to another block of mass 5.6 kg which hangs in the air, as shown. Assume the cord to be light (massless and weightless) and unstretchable and the pulley...

Homework Statement Movers must push a piano onto a truck, the bed of which is a height 1.73 m above the ground. To do this they will use a frictionless ramp. If the piano has a mass of 1635.0 kg and the movers push it up the slope at a constant velocity, how much work do they need to do on...

Homework Statement If the left-hand slope in the figure makes a 60 degree angle with the horizontal, and the right-hand slope makes a 30 degree angle, how should the masses compare if the objects are not to slide along the frictionless slopes? Express your answer using two significant...

Homework Statement A block of mass 2.6 kg (M1) lies on a frictionless surface. Its connected by a massless pulley and string hanging over the edge of the surface of 3.17 kg (M2). Calculate the acceleration of M1(part 1). calculate the tension in the cord(part 2). the cord is...

Homework Statement A person starts from rest at the top of a large, frictionless, spherical surface, and slides into the water below. At what angle θ does the person leave the surface? (Hint: When the person leaves the surface, the normal force is zero.) Homework Equations Don't Know...

A wedge with mass M rests on a frictionless horizontal table top. A block with mass m is placed on the wedge. There is no friction between the block and the wedge. The system is released from rest. Figure http://tinyurl.com/9zcf7uq 1. Calculate the acceleration of the wedge. Express...

Homework Statement Hello all, kinda angry at myself for posting this but my brain has hit a brick wall. This is an easy problem too... anyway. A frictioness ramp of mass M and incline θ sits on a frictionless surface. A block of mass m sits on the ramp. What horizontal force F must be applied...

A 100 N box is being pushed with a horizontal force F at 30 degrees on a frictionless ramp. Determine F and N (normal force). I got about 57.74 and about 115 for the second part (I don't know if it is right) Fcos(theta) -mgsin(theta)=0 for part A N-Fsin(theta)-mgcos(theta)=0 for...

Homework Statement a particle of mass m is contrained to lie on along a frictionless,horizontal plane subject to a force given by the expression F(x)=-kx. It is projected from x=0 to the right along the positive x direction with initial kinetic energy T(o)=1/2kA^2, k and A are positive...

Homework Statement A 5-kg object initially slides with speed V0 in a hollow frictionless pipe. The end of the pipe contains two springs, one nested inside the other, as shown above. The object makes contact with the inner spring at point A, moves 0.1 meter to make contact with the outer spring...

Help please! simple Physics frictionless crate on ramp problem! Urgent!? A crate of mass m = 100 kg is pushed at constant speed up a frictionless ramp (θ = 30.0°) by a horizontal force F. What are the magnitudes of (a) F and (b) the force on the crate from the ramp? So my teacher did this...

If the world was frictionless, would the Earth orbit underneath your feet? Would buildings and things attached to the ground be slamming into you at the same speed as the Earth's rotation?

Homework Statement 1 A particle is gently placed on a frictionless rotating turntable at a distance r from the centre.Describe particle motion from both ground and table frame. 2 A particle is at a distance r from the centre of a frictionless stationary turntable.The turntable then starts...

Homework Statement A frictionless rollercoaster does a vertical loop with a radius of 6.0m. a) what is the minimum speed that the roller coaster must have at the top of the loop so that it stays in touch with the rail? Homework Equations 2∏r should be used for the circumference but i...

Homework Statement Two masses m1 and m2 (m1 > m2) are connected over a wedge shaped block. Assuming both inclined planes are frictionless along with frictionless and massless pulley, calculate an expression for the acceleration of the system. Here's what it sort of looks like...

Hey all, Say you have a slab sitting vertically(like a door) at rest on a frictionless surface. If you push with a horizontal force somewhere near the top(as long as it is above the center of mass), would the slab rotate(tip over)? My friend and I were originally thinking of how much...

Homework Statement Two carts 'a' and 'b' are floating on a frictionless air-track and are stationary. 'a' is three times the mass of 'b'. They are being held together and there is a spring between them. The carts are released. Describe what happens after the release. Homework Equations...

Good afternoon! 1. The Setup One block of Mass M2 is resting on top of a frictionless surface. Another block, M1, is resting on top of the of the first block. There does exist a coefficient between these two blocks, μ. 2. What happens to the bottom block when a force less than μN is...

http://img444.imageshack.us/img444/8148/rollwx.jpg A rope is wound around a cylinder of mass 4kg, and I=0.02kg.m2 about the cylinder axis. The frictional force between table and cylinder is negligible. Solution: a=20/4=5.0m/s2 α=ar is not applicable when slippage occurs. My...

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...

Homework Statement A block moves on the frictionless slide shown in the diagram. What is the minimum height from which the block can be released if it is to complete the loop without leaving the surface of the slide? (Assume that the dimensions of the block are small compared to R, and that...

Hi guys,if i mount a dc motor on a glider that slides in 2 directions without friction, AND, instead of having it drive a mechanism, have a circular plate with an eccentrically drilled hole in it (not centre) mounted on the motor shaft though this hole, i should observe the glider sliding back...

Hi,I want to design a crude pendulum impact device which i can use to measure initial velocities of objects on a frictionless surface. i.e measure energy at the start and end of the pendulums swing, to see how much has been absorbed into the impact. Heres my question about momentum on...

Homework Statement A 30.0-kg gun is standing on a frictionless surface. The gun fires a 50.0-g bullet with a muzzle velocity of 310 m/s. a) calculate the momenta of the bullet and the gun after the fun was fired. b) calculate the kinetic energy of both the bullet and the gun just after...

Homework Statement The 500lb box is released from rest in the position shown. The wall and ground are smooth. Determine (a) the angular acceleration of the box, and (b) the reactions at corners A and B at the instant after release. **G = center of mass **L = length of side = 2.5ft **phi =...

Homework Statement A 58 kg woman and an 78 kg man stand 8.00 m apart on frictionless ice. How far from the woman is their CM? 4.6 m If each holds one end of a rope, and the man pulls on the rope so that he moves 2.6 m, how far from the woman will he be now? Use two significant figures in...

Homework Statement Three boxcars are rolling along a virtually frictionless track at 20m/s when they strike another boxcar sitting motionless on the track. what is the new speed of the 4 coupled bovcars? all the boxcars have the same massHomework Equations 3rd or 2nd Newton lawThe Attempt at a...

Homework Statement As a small verification of a larger problem, I'm trying to determine how the dynamics of an inverted pendulum attached to a frictionless cart would behave. The cart has no input force applied, so all horizontal movements would be due purely to the centrifugal+normal...

At the top of a "frictionless" loop that is 75 cm high, a 75 Kg ball bearing is traveling at 1.9m/s. From what height was the ball released? I have absolutely no Idea where to start here. Diameter= 0.075m Velocity=1.9m/s Force related to Gravity=0.74N m=0.075Kg

Homework Statement Hello. I have a problem with setting up the lagrangian for a system here. The problem is stated at page 8 problem 2.3 with a diagram at the following -->link<--- 2. The attempt at a solution I used two generalized coordinates corresponding to the angle between...

Hey, A certain problem in my physics textbook states that a person pushes a crate over a frictionless surface with a constant force. If the crate accelerates, wouldn't the person eventually have to start running with it in order to keep applying force to it?

Homework Statement A 130 kg crate is pushed at constant speed up the frictionless 23° ramp shown in the figure. What horizontal force F is required? Homework Equations F=ma F(parallel)=mgsin(theta) F(perpendicular)=mgcos(theta) The Attempt at a Solution I know that because it...

Homework Statement The forearm (including the hand) has a mass of 4.26 kg. The upper arm exerts the force of 14 N on the forearm. If the forearm has an acceleration of 2.54 m/s^2, determine the mass of the object being pulled by the hand. (Assume the object slides over a frictionless...

Homework Statement block A slides down an 8 m frictionless ramp that is curved 30 degrees above the horizontal. it then crosses a 4m surface that has a coefficient of friction that is 0.20. it then hits a ball and continues moving at 3 m/s. the ball is suspended from a string, kinda...

Would a piece of metal suspended between two magnets in a vacuum-sealed jar be in a situation of frictionless vacuum? If yes, could such a situation be exploited to build a perpetual motion machine? If no, would the friction be enough to result in an appreciable loss of energy if the piece of...

If a 1 inch diameter steel ball bearing is at rest on a frictionless surface, what slope would be required of the surface for the ball bearing to initiate movement?