BLE Class 8 Science: Solving Simple Machine Numericals Without Errors

Simple machine numericals in BLE evaluate conservation of energy and mechanical ratios.

The 3 Classes of Levers

• First Class: Fulcrum in the middle (Crowbar, scissors). $MA$ can be $>1, =1, <1$.
• Second Class: Load in the middle (Wheelbarrow, nutcracker). $MA$ is always $>1$.
• Third Class: Effort in the middle (Shovel, human forearm). $MA$ is always $<1$, but gains speed.