Flat block is pulled along a horizontal flat surface by a horizontal rope perpendicular to one of the sides. the block measures 1.0 m × 1.0 m, has a mass of 100 kg and a constant velocity of 1.0 m/s, and is separated from the flat surface by a 0.10-cmthick oil layer of 15 °c sae 20 crankcase oil. find the coefficient of sliding friction for the block. does this coefficient of friction change with the velocity?

The coefficient of sliding friction is 3.13

Solution:

As per the question:

Mass of the block, m = 100 kg

Velocity of the block, v = 1.0 m/s

Thickness of the oil layer, t = 0.10 cm =

Temperature, T =

For SAE 20crankcase oil,

Area, A =

Now,

To calculate the sliding friction coefficient:

Oil friction,

where

= Torque

A = Area

Also,

Therefore,

newton's first law of motion

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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