True: Different ramps require different force as the slope and length of the ramp can make work easier or hard., Oil is added to a car engine to prevent friction between the moving part, The people rub the ice to make it smoother so the rock will slide easily and so there will be no friction., False: The chains does not prevent the car wheels from sliding on the snow and give grip to the wheels., The chalk dust causes friction between the weightlifter’s hands and the bar so that his hands will slip., When you rub your hands together the friction does not causes anything,

Leaderboard

Visual style

Options

Switch template

Continue editing: ?