Force and motion
Force and Motion
Lever categories
Another set of advanced categories is based on the class of lever utilized in the mechanism. Here are four categories based on the class of lever. Challenge students to sort their mechanisms according to these four science categories:
1st -class levers: Pivot is between input and output (scissors, pliers)
2nd -class levers: Output is between pivot and input (nutcracker, garlic press)
3rd –class levers: Input is between pivot and output (tweezers, salad tongs)
** **Complex lever systems: more than one lever (nail clippers, vise grips)