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A three **body force** is a **force** that does not exist in a system of two objects but appears in a three **body** system. In general, if the behaviour of a system of more than two objects cannot be described by the two **body** interactions between all possible pairs, as a first approximation, the

The tidal **force** is a secondary effect of the **force** of gravity and is responsible for the tides . It arises because the gravitational **force** per unit mass exerted on one **body** by a second **body** is not constant across its diameter , the side nearest to the second being more attracted by

A non-contact **force** is a **force** applied to an object by another **body** that is not in direct contact with it. The most common example of a non-contact **force** is gravity . A non-contact **force** is different from a contact **force** , which is a **force** applied to a **body** by another **body** that

**wikipedia.org** | 2011/8/15 14:57:59

example making it zero in the case of levitation . Contents 1 Definition 2 Relation with g **force** and mechanical resistive forces 3 Case without non-gravitational external forces 4 Objects at rest 5 Objects accelerating vertically 5.1 Free-fall 5.2 "Beyond" free-fall

**wikipedia.org** | 2011/5/11 0:06:55

Vietnam and North Vietnam in which the United States was deeply involved. The United States Air **Force** was deployed to South Vietnam as part of this effort. Contents 1 Air Bases Used by the USAF in South Vietnam 2 Chronology of the USAF involvement in Vietnam 2.1 Advisory Years

In classical mechanics , the central **force** problem is to determine the motion of a particle under the influence of a single central **force** . A central **force** is a **force** that points from the particle directly towards (or directly away from) a fixed point in space, the center, and whose magnitude

If objects are far from a star, planet, moon, or other such massive **body** , so that they experience very little gravitational interaction with them, or if the objects are at a point that has equal gravitational attraction from multiple masses (such as a Lagrangian point ), they will experience

A fluid flowing past the surface of a **body** exerts a surface **force** on it. Lift is the component of this **force** that is perpendicular to the oncoming flow direction. [ 1 ] It contrasts with the drag **force** , which is the component of the surface **force** parallel to the flow direction

objects) which are considered or idealized as a particle, [ 8 ] in the sense that the extent of the **body** is neglected in the evaluation of its motion, i.e., the object is small compared to the distances involved in the analysis, or the deformation and rotation of the **body** is of no importance

The two **body** problem in general relativity is to determine the motion and gravitational field of two bodies interacting with one another by gravitation , as described by the field equations of general relativity . Solving the Kepler problem is essential to calculate the bending of light by