Adoc worker loading crates on a ship finds that a 18 kg crate, initially at rest on a horizontal surface requires a 80n horizontal force to set it in motion. however, after the crate is in motion, a horizontal force of 46 n is required to keep it moving with a constant speed. the acceleration of gravity is 9.8m/s^2. find the coefficient of friction between crate and floor

Explanation:

Let the coefficient of static friction be

Let the coefficient of kinetic friction be

Let the normal reaction force be

where is the mass of crate and is the universal gravitational constant.

Given,

It is given that is required to overcome static friction,

So,

It is given that is required to overcome kinetic friction,

So,

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.