Friction helps us hold objects.
Which of the following helps us to hold objects together?
Of the following statements choose the correct combination that helps reduce friction: A) Grease is used to reduce friction in bicycle chain B) Ball bearings are used to reduced friction in a fan C) Oil can be used to increase friction in a car engine D) Talc can be used to reduce friction when an object is sliding on a surface.
Explain how friction helps us to walk.