Mechanical Equilibrium Chapter 2 Rope Tricks Break up

Mechanical Equilibrium Chapter 2

Rope Tricks Break up into groups of 3 (2), one of 4 Do the Discover on pg. 12 of book. Each person, answer questions on loose leaf.

What is a Force? • Force is needed to change an object’s state of motion. • Net Force – combination of all forces acting on an object. • Newton (N) scientific unit of Force • Weight – acts downward on an object due to the Earth’s gravity. • Tension – stretching force applied to an object that causes it to go tight or slack (wire, rope, springs)

Force Vectors • Vector – arrow represents the magnitude and direction of a quantity. • Vector quantity – needs both magnitude and direction for a complete description (Force). • Scalar quantity – can be described in magnitude only (Time, area, volume)

Support Forces • Support Force – upward force that balances the weight of an object on a surface. • For an object at rest – support force must equal the object’s weight. • Upward forces are positive (+), downward are negative (-)

Mechanical Equilibrium • ME – State wherein no physical changes occur. • If the net force on an object is zero, the object is at Mechanical equilibrium - Equilibrium Rule • SF=0 • Equilibrium Problems

More Equilibrium • Static Equilibrium – objects at rest • Dynamic Equilibrium – object moving in a straight-line path in a constant speed

Net Forces and Vectors • Parallel vectors add if in the same direction. • Parallel vectors subtract if in the opposite direction. • Vectors at an angle – use parallelogram (diagonal is the resulting vector) • As the angle between the vectors increase, tension increases, or vector length. • Net Forces & Vectors • Nellie's Rope Tensions

Works Cited Rope - http: //dev. physicslab. org/img/ac 273033 -6314 -4 c 9 e-b 7 f 1 -ad 9033 c 58 df 1. gif Force - https: //image. slidesharecdn. com/forcesandtheireffects-110727203328 phpapp 01/95/forces-and-their-effects-pps-3 -728. jpg? cb=1311799213 Vector - http: //www. physics 4 kids. com/files/art/motion_vector 1_240 x 180. gif ME - https: //image. slidesharecdn. com/ch 2 presentationteacher-110801153257 phpapp 01/95/mechanical-equilibrium-18 -728. jpg? cb=1312212949 Support force - http: //i. imgur. com/Yu. Rs 2 J 4. png Dynamic Equilibrium http: //uoitbiology 12 u 2014. weebly. com/uploads/2/5/8/3/25832527/6242737_orig. jpg Nellie - https: //i. ytimg. com/vi/h. SQM 0 ho. S 6 VE/maxresdefault. jpg