Without friction, energy transfer would be easier and stopping motion would be more difficult. If there was no friction, there would be no force slowing down motion when two objects rubbed against one another.Continue Reading
A moving ball would stop if it hit a boulder, but without friction it would roll forever along a flat street. No matter how hard a driver jammed on the brakes, his car would not come to a stop, because brake pads rely on friction. Even the simple act of walking down the street would become dangerous. Without friction between the shoe and the street surface, walking would be much like trying to walk on an icy sidewalk. Trying to light a fire with a match would be ineffective, as striking a match relies on friction between the match head and the strike plate or another hard surface.
On the other hand, energy transfer would be more efficient. A person shoving his friend into another person would find that shove to be more powerful, because the person being shoved would not have friction with the ground to slow him down. With friction, lubricants must be used to increase the efficiency of the moving parts of machinery and decrease the heat caused by the parts rubbing together.Learn more about Physics
Mechanical energy is defined as the energy of an object or system due to its motion or position. It is the sum of the kinetic and potential energy of an object. All moving objects have mechanical energy, whether they are in motion or at a position relative to zero potential energy. For example, a moving truck has mechanical energy because of its motion (i.e. kinetic energy).Full Answer >
The laws of motion and mass, as well as conservation and transfer of chemical, elastic and kinetic energy, are some of the physics concepts demonstrated with a toy slingshot. Use of the slingshot also demonstrates how variables affect these concepts.Full Answer >
Actuators depend on transfer of energy – via electricity, hydraulic pressure, human muscle or otherwise – to perform mechanical work that sets a system in motion or controls it. Actuators can be mechanical systems, such as a pneumatic pump, or digital, such as laser printer drivers.Full Answer >
Charging by friction involves rubbing two different materials together that have different pulls towards electrons, so that one material will pull away electrons when the materials are separated and both will become charged. A common example of charging by friction is rubbing a balloon against hair.Full Answer >