Without friction, the best way to move would be with rocket propulsion. If there are solid objects on this frictionless surface, it would also be possible to move by pushing off of them.Know More
Rocket propulsion and pushing off of objects are both possible because of the physical principles described by Newton's Third Law of Motion: Every action has an equal and opposite reaction. For example, using a fire extinguisher for rocket propulsion would send the foam from the extinguisher flying in one direction and the user would be pushed in the opposite direction. On a completely frictionless surface, something as simple as a person blowing air from his mouth would allow for movement. By pushing the air one way, a person or an object is sent in the opposite direction.
The same sort of thing would happen when pushing against an object in the environment. An example of this can be seen in the real world; ice is a very low-friction surface, so if a stationary ice skater pushes another stationary ice skater, they both move in opposite directions.
Walking does not work on a frictionless surface because taking a step requires gripping the ground through friction. The foot usually stays in place while the rest of the body moves forward. On a frictionless surface, a person trying to walk would essentially be doing the moonwalk in place.Learn more about Motion & Mechanics
Since friction opposes movement, it causes resistance that makes it harder for a sliding object to move, thus slowing down movement. Friction can be seen through the example of a car making a stop; the wheels and breaks cause friction, making the car slow down. In addition to affecting solid objects, friction also causes resistance with glass and liquids by causing a collision that results in heat.Full Answer >
To create a science fair project about wheels reducing friction, the exhibitioner could give live demonstrations of how difficult it is to push identical objects across a surface with and without wheels. Friction is the resistance of a body to motion in contact with another body and is directly proportional to the contact area between two surfaces; wheeled bodies move more smoothly over surfaces because their contact areas are reduced.Full Answer >
A lever makes work easier because it allows a person to move an object using less force. To reduce the force that is necessary to move the object, the person using the lever has to increase the distance for the area they are applying the force.Full Answer >
Friction is unwanted in any situation in which free and continuous motion of mechanical parts is necessary. Some examples include the moving parts inside of an engine, door hinges and water slides.Full Answer >