Final velocity Definition and 247 Threads

A gear train is a mechanical system formed by mounting gears on a frame so the teeth of the gears engage.
Gear teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping, providing a smooth transmission of rotation from one gear to the next. Features of gears and gear trains include:

The ratio of the pitch circles of mating gears defines the speed ratio and the mechanical advantage of the gear set.
A planetary gear train provides high gear reduction in a compact package.
It is possible to design gear teeth for gears that are non-circular, yet still transmit torque smoothly.
The speed ratios of chain and belt drives are computed in the same way as gear ratios. See bicycle gearing.
The transmission of rotation between contacting toothed wheels can be traced back to the Antikythera mechanism of Greece and the south-pointing chariot of China. Illustrations by the Renaissance scientist Georgius Agricola show gear trains with cylindrical teeth. The implementation of the involute tooth yielded a standard gear design that provides a constant speed ratio.

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  1. B

    Calculating Final Velocity with Spring and Friction on Inclined Plane

    Homework Statement A spring with a spring-constant 2.9 N/cm is compressed 34 cm and released. The 9 kg mass skids down the frictional incline of height 30 cm and inclined at a 24◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a distance of 0.8 m along...
  2. P

    Novice Problem for Final Velocity

    1. A lab was performed where students roller an initially stationary cart down a ramp 1.84m long. It took 1.15s to roll off the end of the ramp. What is the final velocity of the cart? vi=0m/s, D=1.84m, t=1.15s vf=? 2. Vav=d/t, Vav= (vi+vf)/2 3. Vav= 1.84m/1.15s=1.6m/s...
  3. S

    What is the Final Velocity After Deceleration?

    Homework Statement An 9.30 kg body moving at 9.30 m/s begins to decelerates uniformly. After 9.30 s the body is 9.30 m from the location were it started to decelerate. What is the final speed of the body 9.30 s after it started to decelerate? Homework Equations I'm not sure what...
  4. C

    Skier on a slope with friction (looking for final velocity)

    Homework Statement A 75Kg skier starts down a 50m high 10˚ slope. What is his speed at the bottom? Part A: Consider skis frictionless Part B: Assume that the coefficient of kinetic friction between the skis and the surface of the slope is µk=.05Homework Equations |Ff|=µk•|FN|...
  5. S

    Rock's Velocity at Bottom of Hole

    Homework Statement A rock is tossed straight up with a speed of 20 m/s. When it returns, it falls into a hole 10 m deep. What is the rock's velocity as it hits the bottom of the hole? Homework Equations V = Vo + at Y - Yo = Vot + .5at2 v2 = vo2 + 2a(Y - Yo) Y - Yo = .5(Vo + V)t...
  6. 0

    What Is the Final Velocity After Two Balls Collide and Move Together?

    Homework Statement Two balls roll towards each other. Ball A moves to the right with velocity 5 m/s and ball B moves to the left with velocity 3m/s. If both balls have the same mass, m=50kg, determine the final velocity of them if they move off together after collision. In which direction will...
  7. W

    Finding acceleration using kinetic friction, final velocity, weight, and force

    Homework Statement A man pushes a chair that weighs 60N with a force of 25N. The chair has a final speed of 4.0m/s. and a kinetic friction of .27. What is the acceleration? Homework Equations i have no idea where to start, i tired this formula that had me find distance but the...
  8. S

    Car-Minivan Collision: Final Velocity Vector

    Homework Statement A car with a mass of 1000 kg traveling with a velocity of 15m/s east collides with a 1200 kg minivan traveling at a velocity of 20m/s north. After the collision the car and the minivan are stuck together. Draw to the scale the final velocity vector of the car and minivan...
  9. B

    Finding final Velocity given mass, force, and displacement

    Homework Statement 2.78 kg block is pulled (from rest) by a force (horizontal surface) of 15.8 N. The coefficient of kinetic friction is .106. What is the velocity after 2.88 m? Homework Equations fk=N(uk) Vf=sqrt((2*W)/m The Attempt at a Solution I attempted to find the final...
  10. W

    Calculate the final velocity of an object accelerating towards a mass

    I need to be able to calculate the final velocity of an object accelerating towards a mass from a distnce with an initial velocity. From my little knowledge of calculus, I am only a junior in high school, i have figured out that this is probably a derivitive problem. But i have no knowledge of...
  11. M

    Calculating Final Velocity on a Ramp

    Homework Statement I'm going to be doing a lab, in which I am going to push a block down a ramp. So right now, the problem I'm going to ask is conceptual, and not actually with numbers. So basically, I need to find the theoretical acceleration, and the theoretical velocity. Then, I need...
  12. T

    Calculating Final Velocity: Need Help!

    final velocity...need help! Homework Statement An object is to be thrown through a window 3.25 m high a distance 8 m away. It is launched at an angle 75 degree above the horizontal. The initial launch speed at the specified angle which will allow the projectile to pass through the window is...
  13. T

    Calculating Final Velocity of Free Falling Objects

    just a quick question! will the final velocity of a free falling object always be negative even if the answer is positive?
  14. T

    Solve Final Velocity & Time for Train Traveling 200m

    Homework Statement A train on a straight, level track has an initial speed of 35.0 km/h. A uniform acceleration of 1.50 m/s sq is applied while the train travels 200 m. (a) What is the speed of the train at the end of the distance? (b) How long did it take for the train to travel the 200m...
  15. M

    Momentum and Impulse. find final velocity

    Homework Statement A 0.10-kg object moving initially with a velocity of 0.20 m/s eastward makes an elastic head-on collision with a 0.15-kg object initially at rest. What is the final velocity of the .10 kg object after the collision ? Homework Equations im not sure which equation to...
  16. E

    Calculating Final Velocity of Matter into Black Hole Event Horizon

    If this is in the wrong section, my apologies, but I'm wondering if it's possible, with known equations, to calculate the final velocity of matter accelerating into the event horizon of a black hole, and what those equations would be. I don't think this is an easy question, so any help is...
  17. D

    Final Velocity of Mass on Frictionless Incline

    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...
  18. D

    Find the final velocity of the two pucks after the collision

    Homework Statement Two hockey pucks approach each other as shown in the figure below. Puck 1 has an initial speed of 21 m/s, and puck 2 has an initial speed of 14 m/s. They collide and stick together. Homework Equations The Attempt at a Solution The pucks didn't have a mass so I...
  19. S

    Kinematics Final Velocity Question

    Hi all. New to the forums. Rookie to Physics. I know this is a really simple question, but I am struggling with it. Help would be greatly appreciated. Q: Determine the displacement of a plane that experiences uniform acceleration from 66 m/s to 88 m/s in 12s. Wouldn't I use...
  20. C

    Sandbag dropped from balloon - find final velocity

    1. Experiencing a constant horizontal 1.10 m/s wind, a hot-air balloon ascends from the launch site at a constant vertical speed of 2.50 m/s. At a height of 205 m, the balloonist maintains constant altitude for 10.0 s before releasing a small sandbag. What is the horizontal displacement of the...
  21. Monocerotis

    Rearranging equations final velocity

    Rearranging equations ! Homework Statement Rewrite the equations to solve for the following 1) final velocity 2) initial velocity 3)time interval Homework Equations Aav = Vf-Vi/t Aav is average acceleration Vf is final velocity Vi is initial velocity t is delta T which is the...
  22. P

    Finding time and final velocity

    Homework Statement A photographer in a helicopter ascending vertically at a constant rate of 12.5 m/s accidentally drops a camera out the window when the helicopter is 60.0 m above the ground. -How long will it take the camera to reach the ground? What will its speed be when it hits? a= -9.8...
  23. K

    How Does Projectile Motion Determine Final Velocity?

    Homework Statement A baseball thrown at an angle of 65.0° above the horizontal strikes a building 18.0m away at a point 5.00m above the point from which it is thrown. Ignore air resistance. 1- find the magnitude of the initial velocity of the ball.-found 2- find the magnitude of the...
  24. W

    Rolling ball down a slope, how to find final velocity?

    Homework Statement A ball is rolled down a rough hill with coefficient of \mu<tan\theta. The hill has a height of h. The ball has moment of inertia of I, mass of m, and radius of r, which are all constant. What is the final velocity of the ball at the bottom of the hill? P.S. I made this...
  25. T

    Help with lab - final velocity of total distance

    Homework Statement All right so this will probably sound a little muddled but I'll try anyway. We conducted a lab today in class. We were given a hot wheels car, a meter stick, a ramp, and a stopwatch. We were told to find final velocity of total distance. We were not told how to actually...
  26. J

    Finding final velocity given 2 charges

    Homework Statement A small metal sphere, carrying a net charge of q_1 = -2.70 \mu C, is held in a stationary position by insulating supports. A second small metal sphere, with a net charge of q_2 = -7.60 \mu C and mass 1.50 g, is projected toward q_{1}. When the two spheres are 0.800 \rm m...
  27. P

    Finding Final Velocity [Need Assistance]

    Homework Statement Question: A motorcycle traveling at 40 ft/s is given an average acceleration of 4 ft/s^(2) for 10 s. Find the final velocity. Homework Equations Average Velocity= [displacement][/total travel time ] v= [[x][/2] - [x][/1]][/[t][/2]...
  28. F

    Acceleration in free fall: find final velocity and height

    Homework Statement A student drops a ball from the top of a tall building; it takes 2.5 s for the ball to reach the ground. A.What was the ball’s speed just before hitting the ground? B.What is the height of the building? Homework Equations v=V(not) + at x=V(not)t + 1/2at(Squared)...
  29. J

    Calculating Final Velocity of 4kg Block with T=35N

    Homework Statement You have a 4kg block attached to a string with T=35N. If the block begins at 5m/s and is lowered 10m what is approxaimate final velocity of block? So I got the question right: Find Fnet and times it by 10m and set (Fnet)(10)= work = KE and find velocity from KE. But...
  30. T

    Final velocity of the mass on an incline?

    A spring with a spring-constant 3.4 N/cm is compressed 27 cm and released. The 9 kg mass skids down the frictional incline of height 13 cm and inclined at a 17◦ angle. The acceleration of gravity is 9.8 m/s2 . The path is frictionless except for a dis- tance of 0.5 m along the incline...
  31. E

    Trebuchet Help: Calculating Final Velocity & Acceleration

    Trebuchet help! 1. Hi, I am writing a report for a trebuchet project, and trying to find the final velocity of the tennis ball, my teacher told us to just use this :F=m(v^2/r) for initial velocity. so I am really confused right now. I don't know how to find final velocity. Also, which equation...
  32. T

    Two moving blocks, find small blocks final velocity

    Homework Statement A small block (mass m) slides down a circular path (radius R) which is cut into a large block (mass M), as shown. M rests on a table and both blocks slide without friction. The blocks are initially at rest, and m starts at the top of the path. Determine the velocity of m...
  33. M

    How Do You Calculate Final Velocity and Time for an Object on a Sloped Surface?

    Homework Statement A 20kg object is on a 10 m long, 15 degree slope , that has a coefficient of friction that is 0.2 Calculate the time to slide down the final velocity at the bottom [b]2. Homework Equations [/b Fg=mag Fn=Fgcos(theta) Fp=Fgsin(theta) mu=Ff/Fn Fr=MAr The Attempt...
  34. B

    How Fast Does a Ball Move When Pushed by Compressed Air?

    final velocity of a ball pushed by compressed air..pls. help! Homework Statement Compressed air is used to fire a 1.72 kg ball vertically upward from a 1.50 m long tube. The air exerts a upward force of 28.7 N on the ball as long as it is in the tube. With what velocity does the ball leave...
  35. C

    Help me find the final velocity tnx

    0.5Kg snowball moving at 20m/s strikes and sticks to a 70Kg man standing on the frictionless surface of a frozen pond. what is the final velocity?
  36. M

    Solving the Yo-yo Problem: Final Velocity Calculation

    Homework Statement A yo-yo has mass of 400 kg and radius of 1.5m. Its axle of rotation has a radius of 0.1m. Its string is attached to a crane. What is its final velocity after it is released. mass (m)=400 kg Radius (R)= 1.5 m axle of yo-yo (r)= 0.1 m...
  37. C

    Calculating Final Velocity of 100kg Object Dropped from 100m

    How can I calculate the impact speed(final velocity) of an object of mass 100kg, dropped from a height of 100m, only considering gravity.
  38. M

    Work Problem/Graph Given/Find final velocity.

    Homework Statement The graph shows the net external force component F cos θ along the displacement as a function of the magnitude of the displacement s. The graph applies to a 65 kg ice skater. http://img9.imageshack.us/img9/3441/0671.gif (a) How much work does the net force component do on...
  39. D

    What is the Final Velocity of Two Repelling Magnetic Masses?

    Homework Statement Consider 2 magnetic masses, m1 and m2; these 2 repel each other for a distance s with force f (relative to each other)...which applies from m1 to m2. Predict final velocity of m1 and m2. Assume final distance to be v1 and v2 Assume the force that f acts is constants, i.e...
  40. F

    Minimizing final velocity on a balistic trajectory

    I thought of the following academic problem while watching a baseball movie. I ballplayer wishes to throw the game-winning ball to a kid in the stands. He wants to minimize the final velocity of the ball. Not the horizontal component of the velocity, but the the total magnitude of the...
  41. T

    Finding components of final velocity- on homework

    The problem states that a plane approaching a mountain peak at a speed of 50 m/s is located at a vertical distance of 100.0 m above the peak. I calculated the distance at which the plane should release the package so it lands on the peak (first question), but the second question ask what the...
  42. D

    Deriving formula for final velocity in 2 repelling bodies

    Homework Statement Consider 2 magnetic masses, m1 and m2; these 2 repel each other for a distance s with force f (relative to each other)...which applies from m1 to m2. Predict final velocity of m1 and m2. Assume final distance to be v1 and v2 Assume the 2 masses at rest initially...
  43. M

    Calculating Work & Final Velocity of a 70kg Mass

    Homework Statement A 70kg mass is in a space and moving at 2.5 m/s. You push it with 200N for 4 m. You then move to the front of the mass and push it backwards with 170N for 3 m. What was the total work done? What was the final velocity? Homework Equations W = rest energy + F1*r -...
  44. S

    What is the final velocity of an asteroid on a collision course with Earth?

    Homework Statement A NASA satellite has just observed an asteroid that is on a collision course with the Earth. The asteroid has an estimated mass, based on its size, of 5 × 10^9 kg. It is approaching the Earth on a head-on course with a velocity of 611 m/s relative to the Earth and is now 5.0...
  45. I

    Finding final velocity in a perfectly elastic collision

    [solved] finding final velocity in a perfectly elastic collision ~~~Two marbles with equal masses collide. Marble A has an initial velocity of 1.69 m/s while marble B is initially at rest. If marble A comes to rest as a result of the initial collision, what is the final velocity of marble B...
  46. S

    Momentum/Impulse [Final Velocity]

    Homework Statement "A truck weighs four times as much as a car, If the truck coasts into the car at 12 km/h and they stick together, what is their final velocity." Homework Equations Change in momentum a = change in momentum b OR m1v1 = m2v2 OR (delta)P system = 0 The Attempt at...
  47. D

    Shooting An Arrow: The Final Velocity

    Homework Statement http://www.angelfire.com/punk/slayer_coool/arrow.jpg The information is there. Its vertical sorry. But I need to know the final velocity.
  48. H

    Using Gravitational constant to get the final velocity

    Homework Statement Evil Alien has put an Asteroid with mass of 1,000,000kg to destroy mankind. Distance from center of the Earth to Asteroid (assume negligible center) is 10^8m and let's the gravitational force do the work. Earth radius is 6.4 x 10^6m and its mass is 5.98 x 10^24kg...
  49. J

    Finding particle one's final velocity in inelastic collision

    Homework Statement particle 1 with mass 6.7 kg going 7.3 m/s collides inelastically with a particle of mass 4 kg at rest. find the final velocity of particle one after the collision. Homework Equations Ki = Kf but, mechanical energy is not conserved in an inelastic collision. pi = pf...
  50. I

    What is the final velocity of mass

    Homework Statement A ball of mass 20.0kg (mass A) traveling at a initial speed of 5.0m/s, collides with a ball of mass 10.0kg (mass B) which was traveling at a initial speed of 1.0m/s. What is the final velocity of mass A, what is the final velocity of mass B? mA = 2mB Homework...
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