The forces that attract water molecules to one another cause surface tension. Water molecules can form hydrogen bonds with each other, and each molecule is attracted to those around it. Molecules at the surface are more attracted to water than the surrounding air, creating surface tension.Know More
The bonds formed by the water molecules at the surface of a volume of water are strong enough to create some unique effects. When water falls through the air in small amounts, instead of falling in a stream, the water tends to form spherical droplets due to the surface tension created by hydrogen bonds. As the water falls through the air, gravity distorts the sphere into the familiar raindrop shape. The same property allows objects that are light enough to float on the surface of the water without breaking the surface. Some insects, for instance, can run across the surface of still water due to the fact that their weight is insufficient to break the tension created by hydrogen bonds on the surface.
The reason hot water seems to wash clothes and dishes more completely than cold water is due to surface tension. Heated water molecules vibrate and move around, reducing the surface tension and allowing the water to soak into soiled areas of clothing or dishes. Adding soap or detergent further decreases the surface tension, allowing the water to serve as a powerful solvent.Learn more about Motion & Mechanics
The equation for tension in a rope is weight plus the product of mass and acceleration. This can be expressed as T = W + ma.Full Answer >
Forces are measured by using devices such as bathroom scales and spring balances, also known as force meters or Newton meters. When the mass and acceleration of an object are given, forces can also be measured using the equation F = ma, where "F" indicates the force, "m" denotes the mass and "a" represents acceleration.Full Answer >
Coplanar forces are forces on a single plane. This means that all points of application are inside that plane and that all forces are running parallel to that plane.Full Answer >
Concurrent forces are forces that all go through one point of intersection. When forces are concurrent, all vectors can be added together to obtain the resultant. If the forces are in equilibrium, the resultant will be zero.Full Answer >