The main source of attraction between two metals, or adhesion, is what causes friction, and any increase of friction requires an increase in adhesion. Friction itself is the force of resistance against two objects as one object slides or rolls over another. This force increases the amount of energy required to move an object a set distance.
Increases in friction can be caused by a change in the surface of the objects in question or by increasing the pressure or volume of the gases or liquids surrounding it. Atmospheric conditions can increase friction by a small amount. An object with higher mass is affected by gravity to a greater degree, increasing its load and the amount of friction it puts into anything it moves against. Objects of sufficient size break up in the Earth's atmosphere because the friction creates heat and resistance that destroys the object.
Friction as a force is not always a factor in the motion of objects. In the vacuum of space, an object may be in motion for long periods without experiencing friction, allowing the object to move at a steady rate in a single direction until it meets an obstacle. Friction is only introduced when this object meets the mass of another object.Learn More
Friction is considered helpful during situations such as, but not limited to, preventing slipping between the shoes and the floor during walking, preventing skidding between tires and the road while driving, in brake pads where friction causes the vehicle to stop, and in order to grip things to hold them properly. In all of these cases, friction is important and very beneficial to completing the task at hand.Full Answer >
Friction happens when one object slides along another object. It is the force that resists the relative motion between the two surfaces. Friction occurs in the opposite direction of the moving object's motion and reduces its speed.Full Answer >
UNSW describes an experiment meant to work out the coefficient of static and kinetic friction. The experiment is set up on a table top surface that’s made of vinyl. Two iron disc, each a mass of 1 kg, are placed such that the lowest seats on a sample of artificial turf. To measure the horizontal force needed to overcome friction, a spring balance attached to the masses is pulled.Full Answer >
Kinetic friction refers to the frictional force of a moving object. If a force is being applied on a stationary object, friction is considered a static force until movement occurs.Full Answer >