Frictionless Definition and 468 Threads

Homework Statement Three blocks are pushed up a frictionless plane that is inclined at an angle of 30 degrees with respect to the horizontal as shown below. The blocks move together with constant acceleration a = 3.0 m/s2. The masses of the blocks are: MA = MC = 1 kg, and MB = 2 kg. The next...

I was solving this question in rotational mechanics (not asking for help). The author then goes to solve this using energy conservation, equating the final kinetic and rotational energy to the initial potential energy. Now, he obviously assumed the object rolled on the surface, which, if...

Homework Statement An object rests at the top of a frictionless incline with length L and angle θo. At the moment the object is released the angle begins to decrease at a constant rate w. Thus the angle as a function of time is θ(t)= θo-wt. Value of w is defined to be the rate such that at...

Homework Statement A 2.0 kg block rests on a frictionless wedge that has a 60 deg incline and an acceleration \vec{a} to the right such that the mass remains stationary relative to the wedge. a) Draw the free-body diagram of the block and use it to determine the magnitude of the...

1. Homework Statement Blocks of mass 5, 10, and 25 kg are lined up from left to right in that order on a frictionless surface so each block is touching the next one. A rightward-pointing force of magnitude 14 N is applied to the left-most block. a) What is the magnitude of the force that...

Homework Statement Homework Equations m1 \SigmaFy=N-m1g = 0 \SigmaFx=T=m1a (Because there's no friction i see no opposing force to T) m2 \SigmaFy=m2g-T=m2a \SigmaFx=0 The Attempt at a Solution m2g-T=m2a T=m1a (m1+m2)a=m2g-T+T I notice that the T's...

Figure 5-58 shows three blocks attached by cords that loop over frictionless pulleys. Block B lies on a frictionless table; the masses are mA = 4.40 kg, mB = 9.80 kg, and mC = 12.0 kg. When the blocks are released, what is the tension in the cord at the right? all i could do on this one is...

Figure 5-56 shows a box of mass m2 = 1.3 kg on a frictionless plane inclined at angle θ = 34°. It is connected by a cord of negligible mass to a box of mass m1 = 2.7 kg on a horizontal frictionless surface. The pulley is frictionless and massless. (a) If the magnitude of the horizontal force F...

Homework Statement A box of mass 20.00kg placed on a frictionless surface is pulled by two horizontal forces in the plane of the floor, as shown below. Determine the following quantities. a) acceleration vector. b) magnitude of resultant acceleration and its angle with the x-axis...

Homework Statement A 5.86 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F = 10.00 N at an angle = 35.0° above the horizontal (x-axis). What is the speed of the block 3.70 seconds after it starts moving? Homework Equations Fcos() - ma = 0...

Homework Statement In a frictionless plane, a block of mass M is attached to a spring initially relaxed of constant k which is attached to a wall. A piece of gum of mass m is then horizontally thrown in direction to the block with velocity v_1 hitting it at time t = 0 in a perfectly inelastic...

Homework Statement Figure 5-60 shows a box of dirty money (mass m1 = 2.7 kg) on a frictionless plane inclined at angle θ1 = 28°. The box is connected via a cord of negligible mass to a box of laundered money (mass m2 = 2.4 kg) on a frictionless plane inclined at angle θ2 = 64°. The pulley is...

Homework Statement A 2.50kg object is moving on a plane with coordinates x=2t2-4 and y=3t3-3. Find the magnitude of the net force at t=2.00s Homework Equations \SigmaFy = 0 (no movement on y axis) \SigmaFx = m*a (mass x acceleration) The Attempt at a Solution Alright, first of all...

Homework Statement A 0.280-kg block along a horizontal track has a speed of 1.30 m/s immediately before colliding with a light spring of force constant 43.6 N/m located at the end of the track. What is the spring's maximum compression if the track is frictionless? The Attempt at a...

Homework Statement A large Wedge with mass 10 kg rests on a horizontal frictionless surface (think right triangle on a unit circle, theta <90 deg.). A block with a mass of 5 kg starts at rest (near the top) and slides down the inclined surface of the wedge, which is rough (does this imply...

Homework Statement A 55kg block is released on a ramp which is frictionless. The ramp is 20 meters long and at the bottom it is moving 8m/s. What is the angle of the ramp? Homework Equations I am looking for the angle but cannot for the life of me figure it out. The Attempt at a...

Homework Statement Consider a frictionless roller coaster. The acceleration due to gravity is 9.8 ms-2. Passenger cars start at point A with zero initial speed, accelerate as they go down to a point B, swing around the vertical circular loop B-C-B of radius 15m, then go on towards further...

Homework Statement A box of mass m1 is hanging from a cable of negligible mass, The cable rounds a pulley, where it is connected to a second box of mass m2 on a frictionless plane. The angle of the inclined plane is \theta as measured from the flat ground. Both boxes are initially at rest...

Homework Statement A frictionless, massless pulley is attached to the ceiling, in a gravity field of 9.81 m/s2. Mass M2 is greater than mass m1. The quantities T1, T2, T3 and g are magnitudes. The Attempt at a Solution The Options are Greater than, Less than, Equal To T1 is...

Homework Statement A plank of length 6m is lying on a smooth horizontal surface and has a mass of 100kg. A 50kg girl walks from one end of the plank to the other. In this experiment, how far will the plank shift and what direction? Why?Homework Equations v_g will mean girl's velocity relative...

Homework Statement [PLAIN]http://img72.imageshack.us/img72/6052/jdff.jpg The Attempt at a Solution For part ii i found the centre of mass of the ladder by 80x2/80+25 = 1.52m up the ladder then force of the wall minus the tension Fw - T = 0 Fw = (9.8 x (25x0.51 + 80x0.67)) / 2.83 (height of...

Homework Statement Two identical, uniform, frictionless spheres, each of weight W , rest in a rigid rectangular container as shown in the figure. Find, in terms of a ratio to W, the forces acting on the spheres due to the container surfaces and one another, if the line of centers of the...

Hi, I have this problem about an object moving along a track due to a uniform gravitational field. It moves from being at rest in the higher position A (xA,yA) to the lower position B (xB,yB). There is no friction at all. What I am supposed to be doing is showing that the total time from A to B...

A question came up on a maths Q+A site about the possibility of wrapping a string around a sphere. http://mathoverflow.net/questions/8091/is-it-possible-to-capture-a-sphere-in-a-knot The obvious engineering solution is to just make a net and put the sphere in, and there are a bunch of photos...

Homework Statement You are standing on the edge of a turntable with frictionless bearings. It is initially rotating when you catch a ball, which is moving in the same direction but faster than you are moving and on a line tangent to the edge of the turntable. Assume you do not move relative...

Homework Statement A 2.0 kg mass rests on a frictionless wedge that has an acceleration of 15 m/s2 to the right. The mass remains stationary relative to the wedge, moving neither higher nor lower. (a) What is the angle of inclination, θ, of the wedge? (b) What is the magnitude of the...

hi can some one please help me with this for an exam? A 33.5 kg block (m1) is on a horizontal surface, connected to a 7.10 kg block (m2) by a massless string. The frictionless pulley has a radius R = 0.081 m and a moment of inertia I=0.110 kgm2. A force F = 244.9 N acts on m1 at an angle θ...

Homework Statement I am trying to calculate the estimated final velocity of a R/C hovercraft i am trying to built. The craft's weight is 6lbs and it is powered by a electric ducted fan that produces 21.3 ounces of thrust. Assuming this craft is actually hovering (no friction with the ground)...

2 really tricky ones for me on this homework assignment. I think I got the other one settled (Thanks to help here) -- now I just need to finish this last one. Homework Statement Two blocks sit on this frictionless table, but there is friction between the blocks. Static = .589 Kinetic =...

Homework Statement A 12 kg box is being held on a 23 degree frictionless incline. Find the box's equation once released. Homework Equations Net force=ma Fpull-Fparallel=ma The Attempt at a Solution 12kg x 9.8m/s = 117.6 N (Fpull-mgsin23)= ma sub. known values in...

17. Two masses are connected by a string and pulled along a frictionless surface by another string one is 5kg and the other is 10 kg to which a tension of 40.0 N is applied. The magnitude of the system’s acceleration is A. 8.0 m/s2 B. 20 m/s2 C. 13 m/s2 D. 2.7 m/s2 (For this question I...

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...

Homework Statement A piston can move without friction inside a large tube of .002m^2 of cross sectional area. The weight of the piston is negligible. A mass of kg sits on top of the piston as shown in the figure below. The large tube is connected to a horizontal smaller tube which has 4 x...

1. The Problem: (Collision with a thin rod -- pinned and unpinned) A small object with mass n and an initial velocity of v sticks to a long thin rod of mass m and length l. The motion takes place on a horizontal frictionless surface. Answer the questions for the situation where a) the rod...

Homework Statement A hollow ball goes down a frictionless ramp. The ball starts at a height of 5 m. The ball has a radius of 4 cm and a mass of 0.5 kg. (a) What is the final velocity of the ball at the ball at the bottom of the ramp if it just slides down the ramp to a final height of 0...

Homework Statement Two masses are places in a frictionless pulley system. Solve for the acceleration and tension force. )its a pullz question and the mu=0.1 Homework Equations So i know that Fg=MG Fnet=ma Ff=MFn How can i solve this question? how come Fnet=Ft came out of nowhere...

Homework Statement A block rests on a frictionless horizontal surface and is attached to a spring. When set into simple harmonic motion, the block oscillates back and forth with an angular frequency of 6.6 rad/s. The drawing indicates the position of the block when the spring is unstrained...

Homework Statement A 29.3 kg block, m1, is on a horizontal surface, connected to a 6.70 kg block, m2, by a massless string as shown. The frictionless pulley has a radius R = 0.055 m and a moment of inertia I = 0.100 kg·m2. A force F = 202.5 N acts on m1 at an angle θ = 29.7°. There is no...

The machine part ABC is supported by a frictionless hinge at B and a 10degree wedge at C. There is also a 120 lb force pushing to the right of point A. Knowing that the coefficient of static friction is 0.20 at both surfaces of the wedge, determine (a) the force P required to move the wedge to...

I just want to check whether my answer is right because this worksheet has no answers. Thanks. The following system of masses are connected by light inextensible strings as shown in the diagram. The string connecting the 5.0 kg mass to the 8.0kg mass passes over a frictionless pulley...

Homework Statement A 4.00 kg block carrying a charge Q=50.0 µC is connected to a spring for which k=100N/m (see diagram). The block lies on a frictionless horizontal track, and the system is immersed in a uniform electric field of magnitude E = 5.00x10^5 V/m, directed as shown. If the block...

Homework Statement A ball is dropped from 10m at a speed of 0m/s. Ground is a frictionless plane (0, 0, 0) with a normal of (0, 0, 1). Ground absorbs 20% of incoming velocity. Find position of ball after 20 seconds. Homework Equations If the ball hits a frictionless plane would it...

Homework Statement On banked turns, the horizontal component of the normal force exerted by the road reduces the need for friction to prevent skidding. In fact, for a turn banked at a certain angle, there is one speed for which no friction is required! The horizontal component of the normal...

Picture has two objects, one on top of the other - the bottom object has a mass of 8 kg. The top object has a mass of 4 kg. The coefficient of friction between bottom object and floor is 0.3. The coefficient of friction between the two objects is 0.2. Acceleration is 4 m/s2. A rope is on a...

Homework Statement A wooden block with a length of 10 cm and a mass of 1 kg lies on an icy plane. A projectile with mass of 2 g hits the wooden block with velocity of 300 m/s and breaks through its center of gravity. How much are the final velocities of the wooden block and the projectile...

Homework Statement A wooden block with a length of 10 cm and a mass of 1 kg lies on an icy plane. A projectile with mass of 2 g hits the wooden block with velocity of 300 m/s and breaks through its center of gravity. How much are the final velocities of the wooden block and the projectile...

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...