Sliding Definition and 716 Threads

Homework Statement http://streetrodjohn.home.comcast.net/~streetrodjohn/physics.jpg A 1-kg block is pushed against a 4-kg block on a horizontal surface of coefficient of friction 0.25, as shown in the figure. Determine the minimum force needed to ensure that the 1-kg block does not slip...

Homework Statement A chain lies on a frictionless table at rest, half off the edge, and half on. As soon as it is let go, it begins accelerating due to gravity only. Determine the acceleration of the chain as a function of time. The mass is m, gravity is g, and the length of the chain is L...

A railroad car has crates in it with a coefficient of .5 w/ the car's floor. The train is moving at 22m/s, how short a distance can it be stopped w/o letting the crates slide? Fnet = 0 because you don't want sliding. a = coefficient of static friction x gravity When I solved for a...

Homework Statement A particle of mass m slides down a fixed frictionless sphere of radius R starting from rest at the top. a. In terms of m, g, R, and Θ, determine each of the following for the particle while it is sliding on the sphere. i. The kinetic energy of the particle. ii...

Homework Statement 75 kg boy, starting from rest, slides down a 30 degrees hill htat is 70 m long. He arrives a thet bottom with a speed of 15 m/s. How much thermal energy has been shared btwn the surface of the hill and the seal of his pants Homework Equations d=(vf2-vi2)/2a KE=1/2Mv2...

Homework Statement The block shown in Fig. 4-48 lies on a smooth plane tilted at an angle = 25.0 degrees to the horizontal. Ignore Friction. Determine the acceleration of the block as it slides down the plane. Picture: http://img504.imageshack.us/my.php?image=webassignplanesa0.jpg...

Homework Statement Question Details: A rope attached to a 19.0 kg wood sled pulls the sled up a 18.0 kg snow-covered hill. A 9.0 kg wood box rides on top of the sled. If the tension in the rope steadily increases, at what value of the tension does the box slip? So far none of the...

Hopefully I posted this in the right place. The setup is standard - A ladder 10 ft long rests against a vertical wall. The bottom of the ladder slides away from the wall at a rate of 1 ft/sec. If we let y be the vertical distance and x the horizontal distance, we use the Pythagorean theorem...

I have been wrestling with this problem for a few days and it is really frustrating me. The image below shows a bar of length l whose endpoints are constrained to move along the lines shown. Point A moves at a constant velocity to the right and I want to find the angle theta as a function of...

Homework Statement In a physics lab, a cube slides down a frictionless incline as shown in the figure (Intro 1 figure) , and elastically strikes another cube at the bottom that is only 1/6 its mass. The picture is located in the attachement. If the incline is 30 cm high and the table is 90...

Homework Statement In this problem, I am supposed to find something wrong with a formula dealing with the problem. There is a block with mass m on a ramp of height h inside a box truck moving with constant velocity u. The angle of the ramp doesn't matter, as this problem will be using energy...

Homework Statement A 5.0 kg block slides along a frictionless horizontal surface with a speed of 7.0 m/s. After sliding a distance of 3.0 m, the block makes a smooth transition to a frictionless ramp inclined at an angle of 40° to the horizontal. How far up the ramp does the block slide...

A particle can slide along a track with elevated ends and a flat central part, as shown in Figure 8-53. The flat part has length L = 40 cm. The curved portions of the track are frictionless, but for the flat part the coefficient of kinetic friction is µk = 0.32. The particle is released from...

Homework Statement A 1.79-kg block slides down a frictionless ramp, The top of the ramp is h1 = 1.54 m above the ground; the bottom of the ramp is h2 = 0.287 m above the ground. The block leaves the ramp moving horizontally, and lands a horizontal distance away. Calculate the distance...

Homework Statement A firefighter whose weight is 812 N is sliding down a vertical pole, her speed increasing at the rate of 1.45 m/s2. Gravity and friction are the two significant forces acting on her. What is the magnitude of the frictional force? Homework Equations Fk = ukFn uk =...

I am having much trouble with these two questions. When you answer can you please xplain the laws you used and why you did what if you can. Thanks. Please click on url to view question http://img410.imageshack.us/img410/6031/physicshj1.th.jpg http://g.imageshack.us/thpix.php myemail...

Homework Statement A 1.79-kg block slides down a frictionless ramp, as shown in the figure below. The top of the ramp is h1 = 1.54 m above the ground; the bottom of the ramp is h2 = 0.287 m above the ground. The block leaves the ramp moving horizontally, and lands a horizontal distance...

Homework Statement http://i450.photobucket.com/albums/qq230/JJBladester/06_p51.jpg?t=1223753179 The 2.0kg wood box in the figure 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...

Hello all - This is my first post, so please be gentle. I have a general question about the coefficient of sliding friction. An object, say a flat stone, is at rest on an incline at 30 degrees to the horizontal. Is it possible to calculate said coefficient without knowing the mass of an object?

Homework Statement A cube of mass m slides down a circular path of radius r cut into a larger block of mass M. M rests on a table, and friction is ignored. Both blocks start at rest and m starts at the top of the circular path. What is the velocity v of the the small cube as it leaves the...

Homework Statement A block of mass m starts from rest from a height h and slides down along a loop with radius r. What should the initial height h be so that m pushes against the top of the track with a force equal to its weight? (ignore friction) Homework Equations U = mgh K = 1/2 mv^2 F = mg...

Homework Statement A mass m1 on a horizontal shelf is attached by a thin string that passes over a frictionless pulley to a 2.8 kg mass (m2) that hangs over the side of the shelf 1.6 m above the ground. The system is released from rest at t = 0 and the 2.8 kg mass strikes the ground at t =...

Hello everyone..so I am new to this forum. I missed the first couple weeks of my AP physics class due to injury and have so much work to catch up on. The problem is, I need a lot of help even though I'm still at a pretty basic level. I keep mixing up a lot of things. Homework Statement "A...

Homework Statement This is from Fundamentals of Physics 8th ed, by Halliday and Resnick: A boy is initially seated on the top of a hemispherical ice mound of radius R = 13.8m. He begins to slide down the ice, with a negligible initial speed. Approximate the ice as being frictionless. At what...

The alarm at a fire station rings and a 96.0-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 3.55 m). Just before landing, his speed is 1.79 m/s. What is the magnitude of the kinetic frictional force exerted on the fireman as he slides down the pole...

Homework Statement A plum bob suspended from a frame settles to a steady position as the frame slides down a frictionless inclined plane. What is the angle the plumb bob makes with the vertical during the slide? http://img261.imageshack.us/img261/2128/442by1.th.jpg...

Homework Statement A mass m slides on a plane. It is attached to an inextensible massless string, the other end of which is attach to an equal mass. you can assume the pulley is frictionless , but that the surface has a coefficient of static friction. and the frictional force has the form F(f)...

Homework Statement A mass slides on an incline plane with friction at an angle theta from the horizontal. The mass starts at rest at a height of h1 + h2 and then slides off a ramp at height h1. a) If the coefficient of friction when a block is sliding down a plane is mu, what is the...

I'm trying to solve the http://www.geocities.com/kemboja_4a/problem.JPG". I have done the following, using Newton's Second Law \frac{N}{\sqrt{2}}i + \frac{N}{\sqrt{2}}j - mgj = m(\ddot{x} i + \ddot{y}j) where N is the normal force on the block m. Comparing the coefficients where...

Homework Statement Refer to diagram for this question: A uniform flexible chain of length 1.50 m rests on a fixed smooth sphere of radius R=\frac{2}{pi}such that one end A of the chain is at the top of the sphere while the other end B is hanging freely. Chain is held stationary by a...

1. Maximum potential of a sliding box down a hill 1. A 150 kg box (with dimensions of 1.30 m on a side) sits at the top of a hill 4.35 m long angled at 30.0° to the horizontal. The box has 250 loops of wire wrapped around it. The loops lie in the plane of this paper. The box is allowed to slide...

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Homework Statement Ugonna stands at the top of an incline and pushes a 100 kg crate to get it started sliding down the incline. The crate slows to a halt after traveling 1.5m along the incline. The initial speed is 2.0 m/s and the angle of incline is 30 degrees. What is the coefficient of...

Homework Statement You are trying to move a heavy crate by sliding it across a rough floor. Identify the forces involved in actually getting it to move. Homework Equations ?? The Attempt at a Solution forces of gravity, air resistance, friction??

Homework Statement The equation below describes a physical situation: 1/2(1.70kg)(3.30m/s)2 + (1.70kg)(9.8m/s2)(2.35m)sin 30º = 1/2(1.70kg)(1.08m/s)2 + 0.320(1.70kg)(9.8m/s2)(2.35)cos 30º Which description best fits the equation? A. A 1.70 kg block slows down while...

Homework Statement A 3kg mass starts at rest and slides a distance d down a smooth 30deg incline, where it contacts an unstressed spring. It slides an additional 0.2 m as it is brought momentarily to rest by compressing the spring (k=400N/m) What is the initial separation d between the...

Homework Statement A block with mass m = 5.00 kg slides down a surface inclined 36.9 degrees to the horizontal (the figure View Figure ). The coefficient of kinetic friction is 0.23. A string attached to the block is wrapped around a flywheel on a fixed axis at O. The flywheel has mass 28.0...

When I started looking into this problem I thought it would be rather easy. As I got into it further I found it getting more difficult. I will explain the image first. These components are circular, but I have unwrapped them for simplification. The block on the top is a complete ring. Force...

Homework Statement A 5.50 kg block (m1) is connected by means of a massless rope to a 3.15 kg block (m2). The pulley is frictionless. Calculate the maximum value for the coefficient of static friction, if the 5.50 kg block is to begin sliding. The diagram is attatched to the post...

My problem states, 2s is required for the mass to slide the distance d from a resting position. If the height h is increased by a factor of 4, while holding theta(angle) at 30, how long does it take the mass to slide the new distance d from rest? height h =5. My main question is (don't...

Homework Statement A block with mass m = 24.6 kg slides down an inclined plane of slope angle 38.4 o with a constant velocity. It is then projected up the same plane with an initial speed 4.90 m/s. How far up the incline will the block move before coming to rest? Homework Equations...

In a physics lab, a small cube slides down a frictionless incline as shown, and collides at the bottom (where it is now moving horizontally) with a cube that is only one-half its mass. If the incline is 30 CM high and the table is 90 CM off the floor. where does each cube land? the teacher...

Homework Statement "A boy is initially seated on the top of a hemispherical ice mound of radius R = 13.8m. He begins to slide down the ice, with a negligible initial speed. Approximate the ice as being frictionless. At what height does the boy loose contact with the ice?" Homework...

Homework Statement Assume g= 10 m/s^2 A plane 25m in length is inclined at an angle of 36.9 degrees. A block of weight 250N is placed at the top of the plane and allowed to slide down. The coefficient of friction is 0.5. The velocity is negative and the block weighs 250N. The mass of the...

Homework Statement The path that a block slides along is frictionless until the block reaches the section L shown in the figure below. The length L = 0.75 m begins at height h = 2.0 m on a ramp of angle θ = 30º. In that section, the coefficient of kinetic friction is 0.40. The block...

Homework Statement A small block starts at rest on top of a frictionless hemisphere (like an igloo) of radius 1.7m. Then the block slides down from the top. At what height above the ground (in m) is the block moving fast enough that it leaves the surface of the hemisphere? Homework...

A 3.00kg box, initially at rest, slides 1.50m down a frictional plane inclined at 20degrees to the horizontal? a) The work done on the box was ? B) the final velocity of the box? a= 3kg*9.8m/s *sin(20)=10.05N 10.05N *1.5m= 15.08N*m b= square root of 2* 10/3 * 1.5...

Homework Statement A block of ice at 0°C whose mass initially is m = 50.0 kg slides along a horizontal surface, starting at a speed vo = 5.72 m/s and finally coming to rest after traveling a distance d = 21.37 m. Compute the mass of ice melted as a result of the friction between the block...

1. A person driving a truck has a box in the back. They are driving at a constant speed (v_0) when they notice a red light and have to stop. What is the maximum acceleration the truck can have without causing the box to slide forward? (Answer must be given in terms of variables, as no values are...

Homework Statement With what frictional force must the road push on a 1200 kg car if the driver exceeds the speed for which the curve was designed by deltav = 14km/hr? The Attempt at a Solution I actually have no clue where to begin with this question. Don't I need the radius to figure...