Sliding Definition and 716 Threads

Homework Statement In the figure below, a block slides along a track from one level to a higher level after passing through an intermediate valley. The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. The block's initial...

Homework Statement A block of mass m slides down the incline of a triangular block of mass M. The angle of inclination is \theta. The trianguilar block is free to slide on a horizontal plane. Assume that all surfaces are frictionless. What is the acceleration of the mass M? Homework...

Homework Statement Two packages at UPS start sliding down the 20° ramp shown in Figure P8.25. Package A has a mass of 5.5 kg and a *coefficient of friction of 0.20. Package B has a mass of 10 kg and a coefficient of friction of 0.15. How long does it take package A to reach the bottom...

Homework Statement A small rock with mass 0.22 kg is released from rest at point A, which is at the top edge of a large, hemispherical bowl with radius R = 0.60 m (the figure ). Assume that the size of the rock is small compared to R, so that the rock can be treated as a particle, and assume...

Homework Statement You are driving with a friend who is sitting to your right on the passenger side of the front seat of your car. You would like to be closer to your friend so you decide to use physics to achieve your goal by making a quick turn. If the coefficient of static friction between...

If an object is sliding down a frictionless ramp will the force on the object by the ramp just be 0? or will it be equal to the normal force? Thanks :smile:

Coefficient of Friction of object sliding down ramp.. need help! Homework Statement An 10.0kg object slides down an inclined plane that is 10.0m in length. THe height of the incline is 6.0m and the speed of the object at the bottom is 9.0 m/s. What is the coefficient of friction of this...

Homework Statement How to find the uk of a box sliding down a hill with only an angle and acceleration Given: angle= 30 acceleration= 3.1 m/s2 Homework Equations 1. uk= fk/fn 2. f=ma The Attempt at a Solution i did the cosine of my angle but i am not sure that is the answer

Homework Statement http://online.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys211/oldexams/exam3/sp08/fig23.gif A child sends a hula hoop (moment of inertia I = MR^2) sliding without rolling across a smooth floor. The hoop has an initial velocity Vsliding. The hoop...

Homework Statement A box initially at rest at the top of a frictionless ramp is allowed to slide to the bottom. At the bottom its speed is 4 m/s. Next, the box is again slid down the ramp, but this time it does not start from rest. It has an initial speed of 3 m/s at the top. How fast is it...

A 5kg block is placed on top of a 15kg block that rests on a frictionless table. The surface between the top and bottom blocks is roughened so that there is no slipping between the blocks. A 40N horizontal force is applied to the top block. What is the minimum coefficient of static friction...

Hi! This is my first post, so if I do anything incorrectly I apologize :redface: Homework Statement A block of wood slides first down and then up a ramp inclined at 25°. Assume the block/ramp kinetic friction coefficient = 0.2. The block starts from rest at position located 3.2 m up...

A very heavy unit sitting on a plane at 1degree angle... i checked that with friction only the unit will stop sliding Vi = initial Velocity is 10m/hr Vf = Final velocity is 0 (as it has stopped) the question is hom much distance will it cover until stopping completely and how long will it...

Homework Statement A point particle of mass m is sliding down a wedge inclined at an angle of \alpha to the horizontal. The wedge has a mass m and is free to slide on a smooth horizontal surface. When the mass has fallen a height h, what will be the speed of the wedge? Homework Equations...

Homework Statement A bullet of mass m is fired with horizontal velocity u at a block of mass M. The bullet embeds itself inside the block. The force of resistance of the block is constant. Find the depths of penetration in the cases: a) The block is held fixed. b) The block is free to...

Homework Statement A particle of mass m is tied to the middle of a light, inextensible string of length 2L. One end of the string is fixed to the top of a smooth vertical pole. The other end is attached to a ring of mass m, which is free to slide up and down the pole. The particle moves in a...

Homework Statement A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.18 and the push imparts an initial speed of 4.1 m/s? Homework Equations MG of the object = mass * 9.8 Friction = mg * 0.18 The...

Homework Statement A block of mass m lies on a wedge of mass M as shown in figure. Answer the following parts separately. (a) - With what minimum acceleration must the wedge be moved towards right horizontally so that the block m falls freely? (b) - Find the minimum friction co-efficient...

1. a box of mass 12 kg slides at a speed of 10 m/s acros a smooth level floor, where it enters a rough portion 3.0 m in length. In the rough portion, the box experiences a horizontal friction force of 72N. a) how much work is done by the frictional force? b) what is the velocity of the box...

1. a box of mass 12 kg slides at a speed of 10 m/s acros a smooth level floor, where it enters a rough portion 3.0 m in length. In the rough portion, the box experiences a horizontal friction force of 72N. a) how much work is done by the frictional force? b) what is the velocity of the box...

If I have an extended (uncoiled) rope sitting on a table, and part of it is hanging off the edge of the table so that it starts to slide (there is friction), how would the normal force of the table acting on the rope change as it slides off? This has been bugging me for weeks, because people...

This isn't homework, but I thought that it's probably better in here, as it's a fairly quick question. OK, so I have 2 identical balls (exact same mass and radius). They rest on the same position on 2 identical slopes (same gradient) and begin to move down the ramps. The only difference 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...

Homework Statement A Planck of length L2 leans against a wall. It starts to slip downwards without friction. Show that the top of the plank loses contact with the wall at 2/3 of it's original height. Homework Equations F*R = torque Moment of Inertia of Rod (I) = 1/3 M4L^{2} Mgh =...

Homework Statement A block is sent sliding up a 50 degree ramp at an initial speed of 9m/s. The coefficient of kinetic friction between the ramp and the block is 0.51. Find the acceleration of the block.Homework Equations Fk = (Fn)uk F=maThe Attempt at a Solution umgsin50 = ma ugsin50 = a...

Starting from rest, a 5.00 kg block slides 2.50 m down a rough 30.0 incline. The coefficient of kinetic friction betwen the block and incline is .436 i need to find the work done by the force of gravity, work done by the friction force between block and incline and the work done by the normal...

Homework Statement Two blocks, of weights 3.6 N and 7.5 N, are connected by a massless string and slide down a 30° inclined plane. The coefficient of kinetic friction between the lighter block and the plane is 0.10; that between the heavier block and the plane is 0.20. Assuming that the...

Homework Statement A m = 2.7 kg wood box slides down a vertical wood wall while you push on it at a θ = 35° angle. What magnitude of force should you apply to cause the box to slide down at a constant speed? Homework Equations The Attempt at a Solution I got 64.5766 N for the...

what is the required force to start moving a sliding door weighing 100 kg with two rollers. what are the forces acting on the system? shall i used rolling friction on this? what formula to use? thanks a lot.

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)...

Homework Statement Johnny jumps off a swing, lands sitting down on a grassy 20 degree slope, and slides 3.5m down the slope before stopping. The coefficient of kinetic friction between grass and the seat of Johnny's pants is 0.5 Homework Equations F=ma Frictional force = \muN...

1. The Problem Two small blocks, each of mass m, are connected by a string of constant length 4h and negligible mass. Block A is placed on a smooth (frictionless) tabletop as shown above, and block B hangs over the edge of the table. The tabletop is a distance 2h above the floor. Block B...

Homework Statement A 2.0 kg wood block is launched up a wooden ramp that is inclined at a 30 ^\circ angle. The block's initial speed is 10\;{\rm m}/{\rm s}. The coefficient of kinetic friction of wood on wood is \mu_k=.200. What speed does it have when it slides back down to its starting...

Homework Statement A block with mass m = 5.0 kg slides down an inclined plane of slope angle 36.5o with a constant velocity. It is then projected up the same plane with an initial speed 1.05 m/s. How far up the incline will the block move before coming to rest? The Attempt at a Solution...

1. A block of mass m2 = 4.00 kg block is placed on top of another block of mass m1 = 12.0 kg block that rests on a frictionless, horizontal table. The coefficient of static friction between the two blocks is 0.600. http://www.flickr.com/photos/43001762@N07/3963579065/ (a) What is the maximum...

Homework Statement A block of mass m is pulled across a level surface by a rope that makes an angle θ with the horizontal. The coefficient of friction is μ. (a) Determine the amount of force F required to slide the block at a constant velocity. (b) Determine the optimum angle at...

1. Homework Statement A block of mass m=1.62 kg slides down a frictionless surface (see below). The block is released at a height h=3.91 m from the bottom of the loop. Assume the bottom of the ramp indicated between the dashed lines in the diagram is a segment of a circle with R = 1.5m...

Homework Statement A block of mass m=1.62 kg slides down a frictionless surface (see below). The block is released at a height h=3.91 m from the bottom of the loop. Assume the bottom of the ramp indicated between the dashed lines in the diagram is a segment of a circle with R = 1.5m...

Homework Statement The coefficent of static friction between the floor of a truck and a box resting on it is 0.38. The truck is traveling at 69.7 km/hr. What is the least distance in which the truck can stop and ensure that the box does not slide? Homework Equations The Attempt at...

A 3kg block starts from rest at the top of a 30degree incline and slides a distance of 2m down the incline in 1.5s find the magnitude of the acceleration. I have always though to find the acceleration you can just use x/(t*t) but i use this formula but i couldn't get the same as the book. is...

Homework Statement This is a concept question rather than a homework question, so i don't have any value for the question. From the figures below, the object is turning horizontally. how do we know the object will start sliding up or sliding down at what angular velocity if there is no...

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...

How is a sliding wheel is opposed by static friction? Static friction acts only when the body is about to move. My point is if the wheel is has a linear velocity and angular velocity than kinetic friction should act on the body rather than static friction.

Homework Statement A small mass m slides on a hemisphere of mass M and radius R is also free to slide horizontally on a frictionless table. An imaginary vertical line is drawn from the center of the hemisphere to its highest point, where the small mass is originally placed at rest. The angle A...

Homework Statement There are two tires separated by a few feet, with a weighted beam attached on top of them. The beam's weight isn't distributed evenly. One of the tires is a fixed point. The other tire slides (doesn't roll) 90 degrees. How do you determine the force required to slide the...

Homework Statement A small cube (m=0.450 kg) is at a height of 393 cm up a frictionless track which has a loop of radius, R = 58.95 cm at the bottom. The cube starts from rest and slides freely down the ramp and around the loop. Find the speed of the block when it is at the top of the loop...

A 44.9-kg seal at an amusement park slides from rest down a ramp into the pool below. The top of the ramp is 1.80 m higher than the surface of the water and the ramp is inclined at an angle of 33.9° above the horizontal. If the seal reaches the water with a speed of 4.51 m/s, what is the work...

Hello: I have an inclined triangular wedge of angle Ø (meaning, this wedge makes angle Ø with the horizontal) and a block is lying on the wedge. the coefficient of friction between the wedge and block is u. (a) determine the max value of Ø for the block to remain motionless on the wedge...

Something strange showed up while I was thinking about the following problem: I'd like to prove, by the only mean of the principle of maximum entropy, that the thermodynamic destiny of a block sliding on an infinite horizontal plane is to stop and come to thermal equilibrium with the plane...

Homework Statement A block of mass m=1.3 kg slides down a frictionless track, as in the attachment diagram. The block is released at height h=4m. The radius of the curvature of the track at the bottom is R=1m. What is the force of the track on the block at A? Homework Equations...