What is Position: Definition and 1000 Discussions

The missionary position or man-on-top position is a sex position in which, generally, a woman lies on her back and a man lies on top of her while they face each other and engage in vaginal intercourse. The position may also be used for other sexual activity, such as anal sex. It is commonly associated with heterosexual sexual activity, but is also used by same-sex couples.The missionary position is the most common sex position, but is not regarded as the most favoured one. It may involve sexual penetration or non-penetrative sex (for example, intercrural sex), and its penile-vaginal aspect is an example of ventro-ventral (front-to-front) reproductive activity. Variations of the position allow varying degrees of clitoral stimulation, depth of penetration, participation on the part of the woman, and the likelihood and speed of orgasm.
The missionary position is often preferred by couples who enjoy the romantic aspects of ample skin-to-skin contact and opportunities to look into each other's eyes and kiss and caress each other. The position is also believed to be a good position for reproduction. During sexual activity, the missionary position allows the man to control the rhythm and depth of pelvic thrusting. It is also possible for the woman to thrust against him by moving her hips or pushing her feet against the bed, or squeeze him closer with her arms or legs. The position is less suitable for late stages of pregnancy, or when it is desired for the woman to have greater control over rhythm and depth of penetration.

View More On Wikipedia.org
Recent contents Top users
  1. K

    Position time graph of object moving in a straight line

    Homework Statement The diagram (http://i83.photobucket.com/albums/j282/missingyoub4urgone/Physicsyahoohelp.png) tracks the location of an object moving in a straight line along the x-axis. When is the object (a) farthest from the origin, (b) at rest for an instant, (c) in the midst of being at...
  2. A

    What is the cyclist's end position? I know his displacement.

    Homework Statement I can't figure out part two to a problem. The first part asked us to find the displacement, but I'll let you read for yourselves: Part 1: A cyclist maintains a constant velocity of 5.3 m/s headed away from point A. At some initial time, the cyclist is 259 m from point...
  3. A

    Instantaneous Velocity with Position v. Time graph

    Homework Statement The position v. time graph for a certain object moving along the x-axis is shown. I don't have the graph. Bu I have the points. (0,-2), (1,9), (4,4), (6,4), (8,-4), (9,0) The object's initial position is -2m. Find the instantaneous velocity at ... (m/s) a.) 0.5s...
  4. N

    Why/how does energy change when measuring position?

    Hello, As a concrete model to refer to, I'll work with the one-particle system in a potential box with infinite edges. Inside the box is a potential barrier of height V. Let's say we've measured the energy at one moment to be E < V. The probability of measuring the particle inside the barrier...
  5. O

    Basic Velocity -> Speed -> Position of particle

    Homework Statement A particle's trajectory is described by x=((1/2)*(t^3)-2t^2)m and y=((1/2)*(t^2)-2t)m, where t is in s. a) What are the particle's position and speed at t=0s and t=4s? b) What is the particle's direction of motion, measured as an angle from the x-axis, at t=0s and...
  6. P

    Projectile Measurements: RPM, Position, Velocity, acceleration

    Hello everybody, I'm working on a project and I want to verify a few theories I have. I'm unfamiliar with equipment for taking these types of measurements, so I wanted a little bit of help on this. Basically a bb is fired from an airsoft gun (350-550 fps), and I want to find the...
  7. A

    Two particle of mass, find distance of equilibrium position?

    two particle of mass, find distance of equilibrium position? need a hint to start question, really appreciate
  8. B

    Electrostatic Force position

    Homework Statement An electric point charge of Q1 = 5.23 nC is placed at the origin of the real axis. Another point charge of Q2 = 1.89 nC is placed at a position of p = 2.63 m on the real axis. At which position can a third point charge of q = -2.62 nC be placed so that the net...
  9. C

    Position of a particle given an equation for acceleration

    Homework Statement The acceleration of a particle is given by a(t)= - 2.1 m/s2 + (3.1 m/s3)t Find the initial velocity v0 such that the particle will have the same x-coordinate at time t=3.96 as it had at t=0. What x-coordinate will the particle have at time t=3.96 Homework...
  10. LarryS

    Position Representation in QFT?

    I have read that, in QFT, unlike QM, there is no position probability density function because position is not considered an observable. Then how is a position measurement represented/modeled in QFT? As always, thanks in advance.
  11. K

    Understanding the Balance: Equal Weight, Unequal Position

    Confused about a simple thing... For a common balance, since both arms have equal weight, what causes the pole to choose a horizontal position? Shouldnt it be stable in any other position as the torque around the centre is zero for any other position too?
  12. T

    What Are the Units of Constants A and B in the Equation x=At+Bt²?

    The position of an object is given by x=At+Bt^2, where x is in meters and t is in seconds. a)What are the units of A? (express answers in terms of m and s) b)What are the units of B? (express answers in terms of m and s) I know this may sound silly, but I really don't understand what the...
  13. K

    Preparing to apply for undergrad. research position

    Hey, everyone. I'm preparing to apply for a undergrad. research position. I have the link about the research topic: http://electron.physics.buffalo.edu/hzeng/ For those who did not goto the link, its about nano-scale magnetism. I want to be part of the research project because magnetism is one...
  14. R

    Quantum Mechanics: Particles & Position Explained

    I just started taking a Quantum Mechanics course at my university (only 3 days into it) and some of the topics got me thinking about stuff. Namely, about "particles". I searched on Physics Forums and found some other posts pertaining to my question, but a lot of the responses referenced topics...
  15. P

    What happens to magnets held in certain position indefinitely?

    Hello, Can someone here settle a debate for me? A friend of mine said that if you hold two neodymium magnets 1" or so apart from each other with attracting ends (N-S) facing each other for prolonged periods of time (years and years), nothing will happen to the magnetic field. I stated...
  16. S

    Given position vs time graph, find velocity?

    Homework Statement Given the graph in the uploaded screenshot, what is the bicyclist's velocity at t=10s?Homework Equations I have been trying to do a slope equation? Rise/run. The Attempt at a Solution Tried to do slope equation. Looks like 75/10, which would be 7.5, but that answer is...
  17. A

    3D Projectile Motion: Finding Y and Z Coordinates of Landing Position of Ball

    Homework Statement A perfectly spherical ball is launched horizontally with a linear velocity of 9.9 m/s and an angular velocity (perpendicular to its trajectory) of 4.1 m/s. The ball's mass is 5.0g. (Diagram for explanation of coordinate system)...
  18. H

    How do you observe the position of an electron?

    How do you "observe" the position of an electron? Do you use x-rays? If so, what happens when you hit the orbital of a given atom with x-rays? Will it just accelerate the electron(s) out of the orbital? Also, how can you then infer the position the electron had initially occupied? Do you just...
  19. W

    Interviewed for Top Electronics Co. - Is the Position Mine?

    So I had an interview with a top electronics company last Friday. It came down to me, and one other candidate. When I was flown out to the east coast, and met with my interviewers, I discovered that my competition had taken a position elsewhere! I proceeded through two interviews...
  20. M

    Visualizing system from position data

    Hi, I have a bunch of text documents, each of which contains (among other information) the x- and y-positions of 1,000 different 2-D disks at some given time. I want to write a code in C which takes each text document and outputs a visualization of the system at that instant in time. The...
  21. B

    Applying for Tutoring Position: Retaking Algebra Test

    I'm applying for a tutoring position at my school. I already passed the pre-interview and took the test (basic algebra). I did not pass the algebra test, because it was all stuff I haven't done in a few years. However I have a retest Monday, and this weekend to study. She wouldn't let me look...
  22. L

    Non line of sight position sensor/ detector

    Hi, I am looking for a sensor/ detector (A) which could perform the following: constrain: transmitter/ receiver (B) size must be small so that it can be inserted in human bone to be detected later, diameter 3mm X 6mm length is preferred, however, a bigger size can be consider as well...
  23. N

    Specify the position of the center of mass

    Homework Statement Two identical uniform rectangular flat planks with sides a and b are glued together to form a T-shaped object. Specify the position of the center of mass. State any theorems you use in order to arrive at your conclusion. See the attempted solution for a diagram. :) The...
  24. T

    Using a graph to find velocity and position at a said time

    Homework Statement Consider the plot below describing the acceleration of a particle along a straight line with an initial position of −15 m and an initial velocity of −3 m/s. A) What is the velocity at 5 s? Answer in units of m/s. B) What is the position at 5 s? Answer in units of...
  25. S

    In which position does the baby lie inside the uterus?

    Hello everyone, But I watched a video on youtube that showed another way.That video suggested a pic like this Is the top pic wrong and my final pic right! Thanks! :smile:
  26. 1

    Particle Velocity and Acceleration Equations for Position Function s(t)

    Homework Statement When will the velocity be zero? t is in minutes s is in metres Homework Equations s = 4t^3 - 8t^2 + t - 50 The Attempt at a Solution I came up with the velocity equation by taking the derivative of function s. I came up with the acceleration...
  27. A

    Commutator of the Hamiltonian with Position and Hamiltonian with Momentum

    To prove: Commutator of the Hamiltonian with Position: i have been trying to solve, but i am getting a factor of 2 in the denominator carried from p2/2m Commutator of the Hamiltonian with Momentum: i am not able to proceed at all... Kindly help.. :(
  28. I

    Finding the velocity and position of a particle from a graph

    Homework Statement Consider the plot below describing the acceleration of a particle along a straight line with an initial position of −15 m and an initial velocity of −3 m/s. A. What is the velocity at 5 s? Answer in units of m/s. B. What is the position at 5 s? Answer in units of...
  29. S

    Defining the potential generated by a particle of unknown position and velocity

    Hello, This isn't exactly homework, but I am attempting to learn quantum mechanics on my own and was wondering if this forum could be used for guidance in that direction. What I want to do is familiarize myself, as accurately as I can, with the specific mathematical picture of the universe...
  30. E

    Finding Min Velocity for Projectile from A to B

    Homework Statement What I would like to do is find the minimum velocity needed to launch a projectile from point A to B when B is not at the same height as A. I keep finding myself stuck with two unknowns (initial speed and release angle) and I am not sure how to resolve them. If the problem...
  31. S

    Some Problem Related to Position vs Time Graph

    Hi So Heres the Question:- A player throws a ball upwards with an initial speed of 29.4 m s–1. (a) What is the direction of acceleration during the upward motion of the ball ? (b) What are the velocity and acceleration of the ball at the highest point of its motion ? (c) Choose the x = 0...
  32. W

    Electrodynamics(?): finding position of particles in function of time?

    Im still on high school so I don't know where this question belongs to, I don't know even what is the exact subject of this question, so I would like you more experienced members to help me understand what exactly I am asking and where I can find information about it: "In an empty universe...
  33. S

    Fukushima Has Fukushima Changed Your Position?

    I'm wondering if anyone here has been so moved by events following the 3/11 earquake, that their position has been changed in regard to nuclear power. First, please let us know your position before March of this year. Second, let us know if you position has changed, either for, or against the...
  34. S

    Super position? or super assumption?

    Hello everyone, after examining the double slit experiment and pondering for several days, I came to the conclusion that the notion of superpositions is a bit of a "leap of faith." "Evidence" for superpositions is said to be the double slit experiment, but could the Idea of superpositions be...
  35. D

    Position of Sun at noon between the Equator and Tropic of Cancer

    In the temperate latitudes of the northern hemisphere, the sun is due south when it reaches the highest point in the sky (see for example http://www.solarplots.info/pages/definitions.aspx" ). What about latitudes between the Tropic of Cancer and the equator? Is the sun due north when it reaches...
  36. O

    Position control for DC motor driven actuator

    I am working on a project where I have a ball-screw type linear actuator being driven by a 24V variable speed DC motor. There is another 24V DC motor that drivers a pinion and ring-gear. The linear actuator controls the system's elevation and the ring gear controls the traverse. I would...
  37. J

    The velocity and acceleration of particle give position vector

    the position vector of the particle is given by s=e^-2ti+sin(2t)j+5t^k calculate its velocity and acceleration at t=0 to get the velocity i differentiated with respect to t and substituted in t=0, giving me velocity=-2i+2j and that's the same as the answer given but I am not sure how to get...
  38. G

    Position vs time graph that relates to a constant non-zero acceleration?

    I know that a constant acceleration would mean that the position is changing, and the position would be moving, and the speed would be changing, (increasing). I would eliminate the far right two choices because the position is changing on them and they are moving at a constant speed, and a...
  39. G

    Linear equations for calculating position for the GPS

    I am doing my Extended essay about the maths involved in calculating your position using the GPS. I am reading a very complete book, but the maths are sometimes too hard or not enough deeply explained for my level and I am struggling to follow some parts. Here I post one page of the book where...
  40. bleist88

    Obtaining a Complete Position function in complex system

    Hi, {First off I should share my ultimate goal, which is to have a position function of time of several bodies, let's say in a solar system, so that the position of each body and the acceleration due to gravity on all the other bodies in the system are given at any time t. Although Kepler's...
  41. bleist88

    Complete position function of time for multibody systems and gravity (Newtonian)

    Hi, {First off I should share my ultimate goal, which is to have a position function of time of several bodies, let's say in a solar system, so that the position of each body and the acceleration due to gravity on all the other bodies in the system are given at any time t. Although Kepler's...
  42. J

    Heisenberg's Uncertainty Principle position and momentum

    Homework Statement Heisenberg's uncertainty principle states that you cannot simultaneously know the position and momentum of an object. In this video link, a laser is aimed through a slot and projected onto a wall. As the slot gets narrower, the projection also gets narrower. Eventually...
  43. O

    Possible Values of Angle in Standard Position

    Homework Statement θ is an angle in standard position with domain 0° <θ< 360° and cot θ = . Find all possible values of θ Homework Equations ? The Attempt at a Solution ?
  44. A

    Position of a body moving by Newtons Univ. Law. of Grav., at a point in time

    Hi all, I am trying to code a simulation that pins two bodies against each other and animates their motion. I am using Sun and Earth as example, with preset positions and velocities, and Newtons Law of Universal Gravitation formula. It all works quite alright, up until I have decided to link...
  45. S

    Differential Equation to Position

    Say you have know the fact that, as something moves along a horizontal surface, a retarding force F= -kv acts on it. Obviously you can use a differential equation to solve for velocity as a function of time; let's assume you get something like v(t)=5 e^(-kt/m). I know that this works out right...
  46. M

    Setting Up File.txt Position for Writing Function

    Hi, is possible to set up somehow cursor on end file.txt position for write function ? I can use only read,close, open functions from /fcntl.h/, + anybody know how convert number system from one to another and to write result into the file in correct way... e.g. I need covert [123456]Z7...
  47. V

    Position doesn't exist prior to measurement?

    It is mentioned in the book "Quantum: Einstein, Bohr and the Great Debate about the Nature of Reality" the following: "Once the momentum of particle A is measured, it is possible to predict accurately the result of a similar measurement of the momentum of particle B as outlined by EPR...
  48. T

    Position expectation value in harmonic oscillator

    Hello, I want to find <xftf|x(t)|xiti> in harmonic oscillator. I tried to insert the complete set of energy eigenstates to the right and the left side of x(t), but it yields somewhat more complicated stuff. Thank you
  49. R

    How accurately can the position of a 2.7keV electron be measured?

    Homework Statement How accurately can the position of a 2.70keV electron be measured assuming its energy is known to 3.00%? The answer is (deltaX)>=? Homework Equations (deltaX)(deltaP)>=h/2pi (deltaX)(deltaE)>=h/2pi The Attempt at a Solution My attempt at this solution...
  50. R

    With what maximum accuracy can its position be determined?

    Homework Statement An 2000kg car is traveling with a speed of (22 (+/-) 0.25) m/s. With what maximum accuracy can its position be determined? Homework Equations (deltaX)(deltaP)>=h/2pi The Attempt at a Solution My attempt was solving for deltaX in the above equation. I used...
Back
Top