Mechanics 2 PDF - Excel First Review

EXCEL FIRST REVIEW AND TRAINING CENTER, INC. Cebu: JRT Bldg. Imus Ave, Cebu City | Davao: 2nd Fl. MERCO Bldg. Rizal St. cor. Bolton St. Physics – Mechanics (Statics and Manila: CMFFI Bldg. R. Papa St. Sampaloc | Baguio: 4th Fl. De Guzman Bldg., Leg...

EXCEL FIRST REVIEW AND TRAINING CENTER, INC. Cebu: JRT Bldg. Imus Ave, Cebu City | Davao: 2nd Fl. MERCO Bldg. Rizal St. cor. Bolton St. Physics – Mechanics (Statics and Manila: CMFFI Bldg. R. Papa St. Sampaloc | Baguio: 4th Fl. De Guzman Bldg., Legarda Road Dynamics) where: r = radius of circle Force is a very D = diameter of circle common concept used in D. Ellipse y Engineering Mechanics. There ab3 Ix = are different types b 4 and classifications a a x of forces. b a3b where: N = normal force Iy = Gravitational Force 4 F = frictional force A force that is exerted by the earth’s R = resultant force gravity on a certain object. Normally, this  = coefficient of friction where: a = length of semi-major axis force is represented by the weight of the  = angle of friction b = length of semi-minor axis object, a force that is directed towards the center of the earth. Dynamic friction is the friction for a With Respect To The Base body in motion. It is always less than the The weight of the object is defined as: static friction. A. Rectangle Excel Review Center W = mg g = 9.81 m/s2 g = 32.2 ft/s2 Moment of Inertia bh3 h Ib = 3 Moment of inertia is also called the Normal Force b-axis second moment of area. A force that is perpendicular to the b surface of contact, if there are two With Respect To Centroid Axis: objects or planes that are in contact with each other. B. Triangle Excel Review Center Centroidal moment of inertia is the C. moment of inertia of the figure with bh3 respect to an axis passing through the Ib = Friction Force centroid. h 12 A force that is parallel to the surface of contact, if there are two objects or planes A. Rectangle b-axis that are in contact with each other. It is b y also defined as the limited amount of resistance to sliding between the bh3 For composite figures and for axis not at surfaces of two bodies in contact. Friction Centroid Ix = 12 the centroid nor at the base, moment of is oftentimes defined as the force that tends to oppose the motion, hence its h x inertia may be calculated using the transfer formula, which is as follows; direction is opposite the direction of the actual motion (for kinetic friction) or the b3h impending motion (for static friction). Iy = 12 Kinetic friction is the friction against a b I = Ig + Ad2 moving object while static friction is the friction against a stationary object. B. Triangle where: d = distance from the centroid to the axis The coefficient of static friction A = area of the figure depends upon the type of materials or h bh3 the nature of surfaces in contact. It is x Ix = 36 independent of normal reaction, length and area of contact. b C. Circle y r 4 D4 tan =  Ix = = 4 64 x Excel Review Center Ix = Iy Website: www.excelreviewcenter.com.ph Facebook: Excel Review Center