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,

increasing transnational kinetic energy. because the transnational kinetic energy formula consists of only two variables, mass and velocity, increasing one of those properties is the only way to increase an object's transnational kinetic energy. increases to mass and velocity, however, do not have the same impact.

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