General Physics(ppt) Ch 12

General Physics(ppt) Ch 12 - Chapter 12 Static Equilibrium...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 12 Static Equilibrium and Elasticity Two forces F 1 and F 2 are equivalent if and only if F 1 =F 2 and if and only if the two produce the same torque about any axi They are not equivalent. if and only if the two produce the same torque about any axis . Two forces of equal magnitude form a couple if their lines of action are different parallel lines. Chapter 12 Static Equilibrium and Elasticity Two necessary conditions for equilibrium of any object : 1. The resultant external force must equal zero. -> translational equilibrium 0 = Σ F 2. The resultant external torque about any axis must be zero. -> rotational equilibrium 0 = Στ Static equilibrium 0 = CM v and 0 = ω No linear or angular speed
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Chapter 12 Static Equilibrium and Elasticity 4 4 3 3 2 2 1 1 F r F r F r F r × + × + × + × = Σ Ο τ 4 ' 4 3 ' 3 2 ' 2 1 ' 1 O F r r F r r F r r F r r ' × - + × - + × - + × - = Σ ) ( ) ( ) ( ) ( τ ) ( 4 3 2 1 ' 4 4 3 3 2 2 1 1 F F F F r - F r F r F r F r + + + × × + × + × + × = If the net force is zero 0 = + + + 4 3 2 1 F F F F O O ' τ τ Σ = Σ If an object is in translational equilibrium and the net torque is zero about one point, then the net torque must be zero about any other point. Chapter 12
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 28

General Physics(ppt) Ch 12 - Chapter 12 Static Equilibrium...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online