1) Which of the following statements about friction is TRUE? a) Friction opposes motion of objects. b) Friction occurs between non-rubbing surfaces.  c) Friction causes moving objects to move faster. d) Friction acts in a direction similar to the direction of an object’s motion 2) When can we say that friction on a floor is greater? a) If the floor is wet. b) If the floor is tiled. c) If the floor is rough. d) If the floor is smooth. 3) Which force causes a rolling ball to stop after a few seconds? a) friction b) gravity c) magnetic d) motion 4) Why is difficult to move heavy objects on a rough surface? a) rough surface is slippery b) there is no friction on a rough surface c) there is lesser friction on a rough surface d) there is greater friction on a rough surface 5) What is the direction of friction between a moving object and a surface? a) toward the direction of object’s motion b) similar to the direction of object’s motion c) opposite to the direction of object’s motion d) perpendicular to the direction of object’s motion

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