P2207_fall10_lecture12 - f s F As the applied force F is...

Info iconThis preview shows pages 1–12. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: f s F As the applied force F is increased, how does the static friction force f s vary? (Assume F is less than that needed to make the block move.) 1 N f s (A) F 1 N 1 N f s (B) F 1 N 1 N f s (C) F 1 N 1 N f s (D) F 1 N 0 0 0 0 0 0 0 0 Today: Kinetic friction What force acting on a car produces its acceleration? Fluid friction Series and Parallel Combinations in Muscle Structure of Striated Muscles: Basic Building Block: The Sarcomere Microscopic mechanism of muscle force production and contraction: Some Numbers: Sarcomere length: fully extended: 2.3 m fully contracted: 1.0 m Force per myosin head: ~ 5 pN = 5 10-12 N. How to get a big motion/contraction? Connect M sarcomeres together in series : x tot = M ( x of one sarcomere) Muscle contracts by ~40% of its length. How to get a big force? Connect N actin filaments together in parallel : F tot = N # of parallel filaments For typical striated muscle, F max 30 N for each cm 2 of muscle cross- sectional area. Microscopic Origin of Friction:...
View Full Document

This note was uploaded on 12/18/2011 for the course PHYS 2207 at Cornell University (Engineering School).

Page1 / 20

P2207_fall10_lecture12 - f s F As the applied force F is...

This preview shows document pages 1 - 12. Sign up to view the full document.

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