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RoseWind [281]
3 years ago
12

A horizontal force of 90.0 N is required to push a 75.0 kg along a horizontal surface at a constant speed. What is the magnitude

of the force of friction (90.0N)
Physics
1 answer:
mariarad [96]3 years ago
6 0

== You're pushing the load <u><em>straight</em></u> along the horizontal surface at a <u><em>constant speed</em></u>.

== The speed and direction of the load are not changing, so there is <u><em>no acceleration.</em></u>

== From Newton's 2nd law of motion, we know that  F = m A .  Since A=0, F must also be zero.  That means <em>NO NET FORCE</em> is acting on the load.

== But how can that be ? You're pushing it with 90 N !

== The NET force is zero.  So something else must be pushing the box, also with <em>90 N of force, exactly opposite to YOUR force, </em>and they add up to zero.

== THERE's your force of friction !

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