View source for User:John R. Brews/Forces

==Forces==
{{Gallery-mixed
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|Force and couple.PNG|Force and its equivalent force and couple
|Centripetal force in circular motion.PNG|Centripetal force '''''F<sub>C</sub>''''' upon an object held in circular motion by a string of length ''R''. The string is under tension '''''F<sub>T</sub>''''', as shown separately to the left.
|Ball on banked turn.PNG|Upper panel: Ball on a banked circular track moving with constant speed ''v''; Lower panel: Forces on the ball.
|Polar unit vectors.PNG|Polar unit vectors at two times ''t'' and ''t'' + ''dt'' for a particle with trajectory '''r''' ( ''t'' ); on the left the unit vectors '''u'''<sub>ρ</sub> and '''u'''<sub>θ</sub> at the two times are moved so their tails all meet, and are shown to trace an arc of a unit radius circle. 
|Local unit vectors.PNG|Local coordinate system for planar motion on a curve.
|Rotating-sphere forces.PNG| Exploded view of rotating spheres in an inertial frame of reference showing the centripetal forces on the spheres provided by the tension in a rope tying them together.
|Rotating spheres in rotating frame.PNG|Rotating spheres subject to centrifugal (outward) force in a co-rotating frame in addition to the (inward) tension from the rope.
|Whirling table.PNG|The "whirling table". The rod is made to rotate about the axis and (from the bead's viewpoint) the centrifugal force acting on the sliding bead is balanced by the weight attached by a cord over two pulleys.
|Forces on rotating water.PNG|Force diagram for an element of water surface in co-rotating frame.
|Moving coordinate system.PNG| An object located at '''x'''<sub>A</sub> in inertial frame ''A'' is located at location '''x'''<sub>B</sub> in accelerating frame ''B''.
|Orbiter.PNG| An orbiting but fixed orientation coordinate system ''B'', shown at three different times. 
|Center-facing orbiting coordinate system.PNG| An orbiting coordinate system ''B'' in which unit vectors '''u'''<sub>j</sub>, j <nowiki>=</nowiki> 1, 2, 3 rotate to face the rotational axis.
|Carousel walk.PNG |Crossing a rotating carousel walking at constant speed, a spiral is traced out in the inertial frame, while a simple straight radial path is seen in the frame of the carousel.
|Centrifugal couple.PNG|Rotating shaft unbalanced by two identical attached weights.
Image|Torque.PNG|Torque vector '''''T''''' representing a force couple.
|Oblate ellipsoid.PNG|An ellipsoid showing its axes
|Pendulum.PNG|While the pendulum ''P'' swings in a fixed plane about its hanger at ''H'', the planes of the Earth observer rotate.
|Unit vector differentials.PNG|As time progresses each unit vector's change is orthogonal to it.
|Carousel toss & catch.PNG|Tossed ball on carousel. At the center of the carousel, the path is a straight line for a stationary observer, and is an arc for a rotating observer.
|Carousel center of curvature.PNG|From the center of curvature of the path, the ball executes approximate circular motion.
|Carousel notation.PNG|Some useful notation for the ball toss on a carousel.
|Carousel circular motion.PNG|The ball follows a nearly circular path about the center of curvature.
|Carousel inertial forces.PNG|The inertial forces on the ball combine to provide the resultant centripetal force required by Newton's laws for circular motion.
|Carousel path statistics.PNG|Stats for a particular path of ball toss.
|Earth coordinates.PNG|Tangent<nowiki>-</nowiki>plane coordinate system on rotating Earth at latitude φ.
|Wind deflection.PNG|Wind motion in direction of pressure gradient is deflected by the Coriolis force.
|Low pressure pattern in northern hemisphere.PNG|In the northern hemisphere, Coriolis force forms a counterclockwise flow.
|Carousel for four rates of rotation.PNG|Path of ball for four rates of rotation. Catcher positioned so the catch is made at 12 o'clock in all cases.
|Coriolis flowmeter.PNG|A fluid forced through a rocking tube experiences a Coriolis acceleration.
}}

==Particles==
{{Gallery-mixed
|caption=Particles
|width=200
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|Standard Model.PNG|The fundamental particles and messenger quanta of the Standard Model.
|Yukawa pion exchange.PNG|A neutron and proton trade identities by exchange of a &pi;<sup>−</sup> in the Yukawa model.
}}