Sliding Definition and 716 Threads

Problem: A 65kg create is to be accelerated at 7 m/s/s up an incline making an angle of 25 degrees with the horizontal. If the coefficient of sliding friction is .2, what force is needed to accomplish this motion? Well I've tried manipulating this equation to give me either a Ff or an Fn for...

A 10kg box slides 4.0m down a frictionless ramp, then collides with a spring whose spring constant is 250 N/m. (Also, the ramp is angled at 30 degrees). a). What is the maximum compression of the spring? b). At what compression of the spring does the box have its maximum velocity? I started...

My first post :D I have an incline of angle (θ) to the horizontal, and a chain of length (l) of a uniform mass (m), I place the chain so that one end is at the bottom of the incline, the entire system is frictionless. I need to find what the velocity is as the last end leaves the incline, and...

Sliding Block Problem (Please Help!) http://img441.imageshack.us/img441/1809/physicsyj6.jpg The drawing shows a large cube(mass=25 kg) being accelerated across a frictionless surface by a horizontal force P. A small cube(mass=4.0 kg) is in contact with the front surface of the large cube...

A box of textbooks of mass 24.4 rests on a loading ramp that makes an angle a with the horizontal. The coefficient of kinetic friction is 0.230 and the coefficient of static friction is 0.360 . I figured out that the angle is 19.8 and acceleration is 1.2m/s^2. I would like to know how to...

A firefighter with a weight of 712 N slides down a vertical pole with an acceleration of 3.00 m/s^2, directed downward. What are the magnitudes and directions of the vertical forces (a) on the firefighter from the pole and (b) on the pole from the firefighter?? I think the magnitudes would be...

I have a question about this problem: "A block is given an initial velocity of 5.00 m/s up a frictionless 20.0(degrees) incline. How far up the incline does the block slide before coming to a rest?" The book gives a clue stating that mgx = -mgsin20.0 and mgy=-mgcos20. My question is...

The 30 lb box A is released from rest and slides down along the smooth ramp and onto the surface. Determine the distance s from the end of the surface to where the box stops. The coefficient of kinetic friction between the cart and the box is \mu_k\,=\,0.6...

https://www.physicsforums.com/attachment.php?attachmentid=6991&stc=1&d=1148442038 rocket1.JPG Given the data in the drawing, find the total distance the sled travel. I got stuck after summing all the forces in the X direction. Help! Here's what i have so far. Sum of all Forces in X Dir...

In Fig. 8-49, a block slides down an incline. As it moves from point A to point B, which are 7.2 m apart, force acts on the block, with magnitude 4.4 N and directed down the incline. The magnitude of the frictional force acting on the block is 5.5 N. If the kinetic energy of the block increases...

Problem 1: I have a mathematical pendulum with a mass m connected to a string of length l. The pendulum is damped by air resistance that is proportional to the velocity, Ffric = -k*v. I need to derive the damping effect the air resistance has on the pendulum - that is, the decrease of the...

Problem 1: I have a mathematical pendulum with a mass m connected to a string of length l. The pendulum is damped by air resistance that is proportional to the velocity, Ffric = -k*v. I need to derive the damping effect the air resistance has on the pendulum - that is, the decrease of the...

3.4kg rock starts at 25 cm on a plane with a 33degree angle. upon reaching the bottom the box slides along the horizontal. friction coeff is .19. how far does the box slide on the horizontal before coming to a rest? ok i need to use .5MVi2 + MGy1 = .5MVf2 + MGy2 + Ffrd first i need to...

Two blocks with masses 4.0kg and 8.0 kg are connected by a string and slide down a 30 degree inclined plane. The coefficient of kinetic friction between the 4.0 kg block and the plane is 0.25; that between the 8.0 kg block and the plane is 0.35 a) calculate the acceleration of each block...

1) I would like to know if I found the deceleration correctly. Since the force of friction is coefficient of friction * Normal Force, and F = ma, would the deceleration be force of friction/mass? 2) How do I calculate the total distance a sliding block traveled? (The block was pushed.)

Here is the question: Block A, with weight 3w, slides down an inclined plane S of slope angle 36.9 degrees at a constant speed while plank B, with weight w, rests on top of A and is attached by a cord to the wall. If the coefficient of kinetic friction is the same between A and B and between S...

Can anyone help me with this problem? A flight attendant pulls her 70.0 N flight bag a distance of 258 m along a level airport floor at a constant speed. The force she exerts is 32.0 N at an angle of 52.0° above the horizontal. Find the work she does on the flight bag and the work done by the...

I've been looking at this question for the last two hours, here's the question and what I've done so far The picture shows 3 blocks, A B and C, block C is ontop of block A. Block B is connected to block A by a rope, and is hanging over the edge. here it is, Blocks A and B have weights...

Hi, could someone please help me? Here is the problem: "A 265 kg piano slides 4.6 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40. (a) Calculate the force...

A 2.0 kg wood box slides down a vertical wood wall while you push on it at a 45 degree angle. What magnitude of force should you apply to cause the box to slide down at a constant speed? (Problem 51, Chapter 5, Knight) I can't figure out this problem and do not have the text to refer to...

The problem is as follows. We know the angle of the wedge to the horizontal. Let's say its a given. We don't know the mass of the wedge or the mass of the block. The planes are frictionless. The mass rests on a "frictionless table". There is a force pushing the entire system. The...

A 36 kg block of ice slides down a frictionless incline 1.2 m long and 0.48 m high. A worker pushes up against the ice, parallel to the incline, so that the block slides down at constant speed. (a) Find the magnitude of the force exerted by the worker. (b) Find the work done on the block by...

Two masses m1=100g and m2=200g slide freely in a horizontal frictionless track and are connected by a spring whose force constant is k=.5N/m. FInd the frequency of oscillatory motion for this system. I don't really know how to go about this problem. I'm assuming that the equation to find...

A crate of oranges weighing 180N rests on a flatbet truck 2.0m from the back of the truck. The coefficients of friction between the crate and the bed are us=0.30 and uk=0.20. The truck drives on a straight, level highway at a constant 8.0 m/s. (a) What is the force of friction acting on the...

"a 5m ladder is placed against a wall. the top of the ladder is sliding down the wall at 0.5m per second. at what rate is the bottom of the ladder moving away from the wall when the bottom of the ladder is 3m from the wall. ? " Dirac.

Hey folks, I was trying to work out a problem on conservation of energy and am totally stuck. Was hoping someone could help... the problem was this... A 38 kg block slides with an initial speed of 7 m/s up a ramp inclined at an angle of 35o with the horizontal. The coefficient of kinetic...

The coefficient of friction between a certain brass block and a large revolving turntable is µ = 0.09. How far from the axis of rotation can the block be placed before it slides off the turntable if the turntable rotates at a constant rate of 33 1/3 rev/min (so that it requires time T = 60/33.33...

Hello, Below are two questions i am unsure of. :rolleyes: Can someone please verify my answers and tell me if i am doing something wrong. thank-you for your help. :smile: 1. A rigid beam 30 m long is leaning against a vertical wall. If the bottom of the beam is pulled horizontally...

A wooden block slides directly down an inclined plane, at a constant velocity of 6 m/s. How large is the coefficient of kinetic friction, if the plane makes an angle of 25 degrees with the horizontal?

Enjoy. http://www.puzzleworld.org/SlidingBlockPuzzles/quzzle.htm To start, try A1236 63266 A4578 ...

An eraser slides down a slope of height 1m that makes an angle of 35 degrees with the ground. It takes the eraser 1,8s to do this. Find the coefficient of friction. I have no clue how to do this. I've not been able to solve any of the equations I've tried, because there is always the mass of...

There is a block of W Newtons and a ramp is A degrees above the horizontal. At this angle the block begins to slide. How do I find the force of friction and then it should be quite easy to find coefficient of friction. (I already have already solve for the normal force Fw and the force...

I've been working on this problem all afternoon and i just have a complete blackout and no idea how to solve it: the question is what force, parallel to the plane has to be applied if the object is moving up an inclined speed at a steady speed of 3.2 m/s. i have the object's mass and the angle...

I have several problems like this and am confused at how to solve. A small box of mass 9 g is initially at some angle with respect to the ploar axis of a spherical dome of radius 3 m as shown in the figure. Starting from rest, the box slides down along the frictionless spherical surface. The...

Does anybody know a website that gives sliding friction (blocks on planes, etc.) example problems? I am trying to figure out how to calculate the coefficient of sliding friction, but I'm having problems doing so. I know the general equation is: coefficient of sliding friction = friction...

A 393 kg piano slides 3.7 m down a(n) 27° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. (a) Calculate the force exerted by the man. (b) Calculate the work done by the man on the piano...

Here is the problem: The velocity of a 2.3 kg block sliding down a frictionless inclined plane is found to be 1.12 m/s. 1.20 sec. later it has a velocity of 5.08 m/s. What is the angle of the plane with respect to the horizontal? There is quite a bit of information here. I have gathered some...

Can a bead desecnd down a helix have zero vertical component for its acceleration? (i.e. If I found my result to only has coefficients for its horizontal radial component unit vector (e_r), but zero for that of the vertical unit vector (e_z) ! ... That means I got zero vertical component for...

Hi, this is my first post on here hope I can answer some in the future. I've finished everything except these two problems. I've got the answers except I can't figure out how to arrive at the conclusions. 1) A 4.2-kN piano is to be slid up a 3.5-m frictionless plank at a constant speed. The...

I have to do a lab this grading period, which I chose out of a hat. The lab is on the coefficient of sliding friction. I have to have an experiment, but I do not want to just have different objects slide off a ramp or anything simple like that. Does anybody have a good experiment idea that...

http://geomaps.wr.usgs.gov/parks/deva/racetrack.pdf [link updated] 6/20/09 New Paper Claims Explanation https://www.physicsforums.com/showthread.php?t=60676&page=5#90

A block of mass m is attached to a horizontal spring with constant k. resting on top of this block is another block of mass m. a coefficient of static friction mu exists between the two blocks. now suppose the spring is initially at equilibrium length, and someone gives it a push. the block...

This isn't really homework because I'm not doing it for school. I'm on my holidays at the moment, and I'm trying to do a bit of Physics on my own. As you can imagine, I have not gotten far, and am stuck on this problem: A stone slides in a straight line across a frozen pond. Given that the...

A 26.0 kg box slides 4.0 m down the frictionless ramp shown in the figure, then collides with a spring whose spring constant is 170 N/m. 1-- What is the maximum compression of the spring? 2-- At what compression of the spring does the box have its maximum velocity? this is killing...

Hi we're doing a project in class where we make roller coasters and we test them out by sending a marble down them. As a bonus question my teacher asked why there would be an error in the calculations we do (finding speed at different locations of the roller coaster) if we're using a...

Hey I am having trouble doing this question--> A gardener exerts a force of 150 N [ 22 degrees below the horizontal] in pushing a large 18 Kg box a distance of 1.6 m. The coefficient of kinetic friction between the box and the floor is 0.55. Question --> Use Newton's law to...

Let say we have a sliding box. The box is sliding because of an constant force perpendicular to the box. There is no friction and no air restistance. Does the speed of the box increase or is it constant. ?

Consider a block of mass 'm' kept on the hypotenuse of a right triangular wedge of mass 'M'. Calculate the accelaration of the wedge and the block. Hence find the force that should be applied to 'M' so that 'm' does not move?

Two blocks, a one foot cubic block in sitting on top a four foot cubic block. Both blocks are moving forward at 36 fps and instantly begin to decelerate...the larger block with cof of .9 (-28.98 fps/sqr) and the top block with cof of .3 (-9.66 fps/sqr). Trying to determine the time/distance...

Can you solve the "particle sliding on a movable inclinded plane" problem... ...using Newtonian Mechanics? No Lagrangians.