Download Dynamics - MSU Engineering

Dynamics
of
Mechanical Systems
Jeff Rhoads and Terry Ballinger
MST @ MSU
2006
Outline
What is Dynamics?
 Kinematics
 Kinetics
 Newton’s Second Law
 Today’s Activity

What is Dynamics?
What is Dynamics?

Scientific Definition
A scientific discipline that deals with systems
undergoing change
What is Dynamics?

Scientific Definition
A scientific discipline that deals with systems
undergoing change

Engineering Definition
Deals with the relationship between forces
and motion of mechanical systems
What is Dynamics?
Dynamics
What is Dynamics?
Dynamics
Kinematics
What is Dynamics?
Dynamics
Kinematics
The study of motion
(mathematical construct)
What is Dynamics?
Dynamics
Kinematics
The study of motion
(mathematical construct)
Kinetics
What is Dynamics?
Dynamics
Kinematics
The study of motion
(mathematical construct)
Kinetics
Relates forces and motion
(based on physical law)
Kinematics

The study of motion
Kinematics

The study of motion
Position
Velocity
Acceleration
Kinematics

The study of motion
Position
Velocity
Acceleration
Spatial
Location
Origin
Object
Kinematics

The study of motion
Position
Velocity
Acceleration
Rate of change of position
(movement, can see it)
Kinematics

The study of motion
Position
Velocity
Acceleration
Rate of change of velocity
(can feel it)
Kinetics

Relates forces and motion
Kinetics

Relates forces and motion
Newton’s Second Law
Kinetics

Relates forces and motion
Newton’s Second Law
Force  Mass  Acceleration
Kinetics

Relates forces and motion
Newton’s Second Law
Force  Mass  Acceleration
Action
Resistance
Motion
Kinetics

Relates forces and motion
Newton’s Second Law
Force  Mass  Acceleration
Action
Resistance
F  ma
Motion
Today’s Activity
Popsicle Stick Slingshot
Objective
Create a slingshot that will propel a ping pong ball as far as
possible.
Design Considerations



Convert as much of the rubber band (elastic
potential) energy into kinetic energy of the ball.
Have a strong and stable enough structure to support
the force of the rubber band.
What is the best possible way to launch the ball?