Equilibrium

# Equilibrium - first condition for an object to be in...

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Equilibrium Things not Moving (sweet)

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Everyday Forces 1. Weight : This is the force of gravity. Or gravity acting on a mass w = mg 2. Normal Force : The force a surface applies to an object. It is ALWAYS perpendicular to surface
Everyday forces cont. 1. Tension : The force applied by a rope. Or the force in a rope. Ropes only pull. 2. Applied Force : A force applied by some object, like a person, that does not fall into any previous category 3. Friction : The force a surface applies that resists motion or an applied force

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Drawing Free Body Diagrams 1. Draw forces acting on object acting through the center of mass 2. Label “everyday” Forces F N mg
Forces in Equilibrium Σ F = 0 meaning: ΣF x = 0 ΣF y = 0 ΣF z = 0

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Forces in Equilibrium (ex 5.3 p. 157)
Forces in Equilibrium 25 N 12 N 60° F = ? Θ = ? 16 N @ 68°

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Objects in Equilibrium All the forces on an object must add to zero for the forces to be in equilibrium, however this is just the

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Unformatted text preview: first condition for an object to be in equilibrium. • You see, in addition to the object’s center of mass having no acceleration, we also want the object to not rotate 2 nd Condition for Equilibrium Torque • A force applied to an object away from a pivot point (let’s say a distance r) will cause the object to rotate (think of a door or wrench). • A torque is the measure of the tendency of a force to cause or change the rotational motion of a body Torque • Counterclockwise rotations will be POSITIVE • Clockwise rotations will be NEGATIVE (your book arbitrarily chose this) Center of Gravity What is m? Example 11.2 p 410 Example 11.3 p 411 Classic Situations • Diving Board (#11 p. 426) • Sign (#13, 14 p. 426) • Door (on board) • Ladder (#10 p. 426) • No torque hanging chandelier (# 7, 8 p194)...
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Equilibrium - first condition for an object to be in...

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