# What does 'inertial frame' mean when we say that "the free surface of a liquid is resting in an...

## Question:

What does 'inertial frame' mean when we say that "the free surface of a liquid is resting in an inertial frame."?

## Newtonian Mechanics:

The Newtonian mechanics is based on three equations of motion which are applicable on the frame of reference conformable to state of rest or state of uniform motion the observer's frame of reference. The frame of reference is categorized as an inertial and non-inertial frame of reference.

• Inertial frame, in brief, is the frame of reference which is not accelerating.
• The frame of reference may be in rest state or state of uniform motion.
• All physics laws are conformable to the inertial frame of reference.
• The state when the frame of reference is accelerating with respect to the frame of reference of the observer then it is the non-inertial frame of reference.
• Concept of pseudo is applied in such a frame of reference.
• The free surface of a liquid is resting in an inertial frame means that physics relations can be applied to determine the unknown variables.