V. Abstraction The mass of the objects in contact increases or decreases frictional force. The greater the mass, the greater the frictional force. In the activity, the AA battery has greater mass than the AAA battery. The AA battery therefore exerts greater force on the surface. Because of this, the frictional force of between the AA battery and the floor is greater compared to the frictional force between the AAA battery and the floor The type of a surface increases or decreases the distance travelled by moving objects Smooth surface allows the object to travel greater distance due to lesser frictional force. Conversely, rough surface has greater frictional force. This is the reason why ramps, sidewalks, and roads are not overly smoothened so as to allow traction and increase friction The desirable effects of friction allow us to grip or hold things. Basically, any way that friction can make the human life better is a desirable effect of friction. On the other hand, some of the undesirable effects of friction makes objects difficult to move continuously. It also converts some energy into heat, noise, and causes wear and tear on materials. If the desirable effects of friction are those that improve the lives of humans, it can be said then, that the undesirable effects of friction encompass all things that make human lives less easy due to friction. Application 1. Why are there thread patterns in tires and spikes in shoes?
