Friction is a force that works against motion. While walking, friction helps us maintain our stability and prevents us from slipping. Friction also works the same way with cars and vehicles in general, preventing them from skidding and helping them stop when the brakes are applied.Know More
Consider two different situations. In one situation, you are walking on a pavement on a nice warm day, feeling the concrete beneath your shoes. In the second situation, you are walking on the same pavement on an icy winter day, feeling the slick ice beneath your shoes. In the second scenario, the ice reduces the friction, which causes you to slip. In the first scenario, there is more friction between your shoes and the concrete. Since friction is a force that works against motion, the friction between your shoes and the concrete works against the motion of you slipping and falling.
Friction is also necessary to perform many simple tasks in our daily lives. Take writing for example. When you hold your pen or your pencil, it is the friction between your finger tips and the pen that keeps the pen from sliding out of your hand. Think of trying to sand a block of wood or cutting a block of wood in half with a saw: friction is at work in both cases.
Even though friction is popularly viewed as a force that increases the gas consumption of vehicles or one that causes heat to be generated between moving parts, it makes the world a much safer place to live in and most certainly helps us increase our productivity.Learn more about Electricity
An ampere (or amp) is a measure of the amount of electricity, called "current," in a circuit, while voltage is a measure of the force behind that electricity's motion. In a common textbook analogy in which a circuit is imagined as a garden hose, current (measured in amps) would be the volume of water within the hose and voltage would be the pressure that pushes it onward.Full Answer >
An electric force is an attractive or repulsive force between two charged objects. Electric forces are attractive when two objects have opposite charges and repulsive when two objects have like charges. Electric forces are different from magnetic forces, although the two are strongly related.Full Answer >
A static force refers to a constant force applied to a stationary object. A static force is too weak to move an object because it is being countered by equally strong opposite forces.Full Answer >
Electromotive force is the difference in electrical potential between two points that compels electricity to flow to an area of lower potential in order to equalize charge. According to the HyperPhysics website, the force is measured in volts and frequently abbreviated as "emf."Full Answer >