Chapter 2 Review of Forces and Moments - Brown University

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Swivel joints don’t often appear in 2D problems. When they do, they look just like a pinned joint. Ball and socket joint Your hip joint is a good example of a ball and socket joint. The joint prevents motion, but allows your thigh to rotate freely relative to the rest of your body. Reaction forces: Prevents any relative motion. There must be three components of reaction force. Reaction moments. Allows free rotation about all 3 axes. No reaction moments can be present. Ball joints don’t often appear in 2D problems. When they do, they look just like a pinned joint. Slider with pin joint Allows relative motion in one direction, and allows relative rotation about one axis Reaction forces: Motion is prevented in two directions, but allowed in the third. There must be two components of reaction force, acting along directions of constrained motion. Reaction moments: Relative rotation is prevented about two axes, but allowed about a third. There must be two components of reaction moment.
2D slider joints are often represented as shown in the picture below A A or A A (2) (1) R (1/2) Ay A R (1/2) Ay R Ay Slider with swivel joint: Similar to a swivel joint, but allows motion in one direction in addition to rotation about two axes. Reaction forces: Relative motion is prevented in two directions, but allowed in the third. There must be two components of reaction force acting to prevent motion. Reaction moments: Rotation is permitted around two axes, but prevented around the third. There must be one component of reaction moment.
Page 1 and 2: Chapter 2 Review of Forces and Mome
Page 3 and 4: US units have a frightfully confusi
Page 5 and 6: 3. Specify the distance you need to
Page 7 and 8: Selecting a load cell As an enginee
Page 9 and 10: TABLE OF POSITIONS OF CENTER OF MAS
Page 11 and 12: where L is the length, and η is th
Page 13 and 14: Applications of electrostatic force
Page 15 and 16: Archimedes’ principle gives a sim
Page 17 and 18: manufacturers usually use the proje
Page 19 and 20: Interatomic forces Engineers workin
Page 21 and 22: 2.2.2 Resultant moment exerted by a
Page 23 and 24: An arbitrary strip of the beam with
Page 25 and 26: Thus, the force on the left exerts
Page 27 and 28: Similarly, the perpendicular distan
Page 29 and 30: The trick gives you a quick way to
Page 31 and 32: 2.3.2 Pure moments, couples and tor
Page 33 and 34: (v) Moments appear as internal forc
Page 35 and 36: (1) Does the connection allow the t
Page 37 and 38: 2.4.4 Reaction Forces and Moments a
Page 39: Example2: Some types of bearing all
Page 43 and 44: Three rules that help to establish
Page 45 and 46: 2.4.6 Some short-cuts for drawing f
Page 47 and 48: The forces and moments shown are th
Page 49 and 50: When we do engineering calculations
Page 51 and 52: (ii) The critical force required to
Page 53 and 54: 2.5.3 Experimental values for frict
Page 55 and 56: (1) All surfaces are rough; (2) All

Chapter 2 Review of Forces and Moments - Brown University

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