Lecture 1

Question 1

Definition of Structure

Answer 1

a solid body

can be flexible or rigid

Question 2

definition of machine

Answer 2

structures connected together in a way that allows parts to move relative to one another

Question 3

Whats is Newtons Second Law

Answer 3

sum F = ma

Question 4

Rotational equivalent of Newtons Second Law

Answer 4

sum MG= IG * alpha

Question 5

How many degrees of freedom does a rigid body have

Answer 5

6, 3 rotation, 3 translations

Question 6

idealised elements for dynamics models

Answer 6

spring (stiffness)
damper (damping)
rigid body (mass, moment of inertia)

Question 7

What do we assume about most systems

Answer 7

Linear and obeys additivity

Question 8

What does does additivity mean

Answer 8

if f(a) = A and f(b) = B then f(a + b) = A+B

Question 9

what is homogeneity

Answer 9

f(a) = A then f(Ca) = CA

Question 10

What does a free body diagram show

Answer 10

sketch showig principal forces and motions
simple/clear statement of situation
basis for equations

Question 11

On a free body diagram where will the springs and stiffness be placed on a rigid body generally

Answer 11

Will be placed such that they can resist the movement of the mass