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Answer:
5.Smooth surface- polished marble floors, water splitter on a floor. rough surface- our blackboard, wood. Answer: Smooth surfaces are those surfaces which has a negligible amount of friction on their surface or lesser surface drag.
6.A spring scale or spring balance or newton meter is a type of mechanical force gauge or weighing scale. ... It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position.
7.An easy way to measure the coefficient of static friction is to place two objects together and then tilt them until the top one slides. The angle at which one object starts to slip on the other is directly related to the coefficient. When the two objects are horizontal there is no frictional force.
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