The three levels of physics are different based on fulcrum, potential force, and resistance force.
物理学的三个层次根据支点、势能和阻力的不同而不同。
VOA Special 2019年10月合集
As the Syrian city of Idlib fell to coalition forces, the group's leadership worked to create an active and growing resistance force.
随着叙利亚城市伊德利卜落入联军之手，该组织的领导层致力于建立一支活跃且不断壮大的抵抗武装力量。
英语百科
Resistance force
In physics, resistance force is the force which an effort force must overcome in order to do work on an object via a simple machine. Resistance force, like most other forces, is measured in newtons or in pounds-force.
For an ideal (frictionless) mechanism in which no energy is lost, resistance force obeys the relation: