Mechanical efficiency
Kev ua hauj lwm zoo yog hais txog qhov feem pua ntawm kev ua haujlwm (kev ua haujlwm muaj txiaj ntsig) thiab kev ua haujlwm tawm tswv yim (ua haujlwm muaj zog) ntawm lub tshuab thaum lub tshuab ua haujlwm tsis khov. Cov ntsiab lus tseem ceeb suav nrog pulley block, slope efficiency, kev sib hloov qib, kev ua haujlwm nquag, thiab nce kev ua haujlwm.