Yell at student: get up, etc.
This is a force
Problem is: how much
Difficult to quantify
Force is good stuff: can do several different types of things
Change an object's velocity (magnitude & direction)
Cause an object to start moving, or move faster
Cause an object to stop moving, or move slower
Change the direction an object is moving
Can also change the shape of an object
Hit a rock with a hammer
The "bounce back" is due to the rock snapping back into its original shape after deformation by the hammer
We will study 4 different types of energy systems
And the forces that drive them
Including methods of quantification
Equilibrium is the key to understanding force
DIGRESS TO: balanced vs. unbalanced force
Unbalanced forces cause in a disruption of equilibrium
The system must adjust in an attempt to restore equilibrium
This results in work being done
The amount of force applied directly affects the amount of work performed