1. “Mechanics of motor proteins and the cytoskeleton” Jonathan Howard
Chapter 2
Mechanical Forces
Dr, Neiman
Yinyun
Sudiksha

2. Protein Molecule

3. Mechanical Forces Acting on The Protein Molecule

4. Introduction to Mass, Spring and Dashpots
Objects
Properties
MASSES
SPRINGS
Dashpots
Basic Pictures
Equation of Motion
Newton’s 2nd Law of Motion
Hooke’s Law
Stokes Law

5. Motion of Masses, Springs and Dashpots

6. Motion In a Dashpot

8. Motion of Springs, Dashpots, and Masses Induced by Applied Forces
Example 2.2

9. Motion of Combinations of Mechanical Elements
(A) Mass & Dashpot (ex 2.3)
(B) Spring & Dashpot(ex 2.5)
(c) Mass & Spring(ex 2.6, 2.7)

10. Motion of a Mass and Spring with Damping
The equation of motion:
Underdamped:
Overdamped:
Inertial forces
(tend to produce oscillations)
v.s.
viscous forces
(tend to damp the oscillations out)

11. Work, Energy and Heat
Work: Potential energy: Kinetic energy: Heat: First Law of Thermal Dynamics: Conservation of Energy.

12. Conservation of Energy

13. Summarization 3 mechanical elements: Mass, Spring, Dashpot
2 ways of responding to mechanical forces:
oscillate or move monotonically
2 ways to generalize the mechanical models : increase the number of mechanical elements or consider the “continuum” solids that have material properties such as elasticity, density and viscosity.