Does anyone know how to do this? the scenario is ""dominique reads that race cars have wide tires because the increased area of contact between the tire and the road results in a stronger force of friction. she hypothesizes that the force of kinetic friction on an object is directly proportional to the area of the object in contact with the surface and wants to test this hypothesis. dominique and blake take a long wooden plank and cut the plank into pieces that have different lengths but the same width and height. the students also have access to other equipment commonly available in a school physics lab.