Spring (device)

A spring is a bouncy tool.

It can stretch out long. It can also squash down short.

Some springs can even twist.

When you pull a spring, it wants to snap back. This helps it store power. A bow is like a spring. It stores power to shoot an arrow.

Most springs are made of metal. Some are made of wood. Many springs look like a coil.

Springs can be flat. They can be shaped like a circle. Some are even shaped like a cone.

Springs are all around us. They help many things work.

A spring is a tool made of elastic material. Most springs are made of metal called spring steel.

Some springs are even made of wood, like a bow.

Springs work by storing power. When you squash, stretch, or twist them, they hold onto that power. This is called elastic potential energy.

There are many ways to use a spring. A tension spring stretches out when you pull it. A compression spring gets shorter when you push it. A torsion spring works by twisting.

Many springs look like a coil. These are called helical springs. Some coils are shaped like a cone. Others are flat, like a leaf spring.

In 1676, a scientist named Robert Hooke shared a rule. He said the force a spring uses is tied to its change in length. This is known as Hooke's law. It helps us understand how much a spring will push back.

Springs are in many things, like clocks and car parts.

A spring is a clever tool made of elastic material. Most springs are made from a tough metal called spring steel.

Some springs are even made from things like wood. A bow is a great example of a non-metallic spring. When you pull a bow, it stores energy to shoot an arrow. Springs are very important because they can store energy in different ways. They hold energy when they are compressed, extended, or even twisted.

There are several ways a spring can work. A tension or extension spring stretches out when you pull it. A compression spring gets shorter when you push it.

A torsion spring is different because it works by twisting. When you twist it, it produces a torque, which is a twisting force. Some springs are shaped like a coil, which is also called a helical spring. Other designs include flat leaf springs or even small, disc-shaped Belleville washers.

People have used springs for a very long time. Simple springs like the bow have been used throughout human history. During the Bronze Age, people used more complex spring devices like tweezers. A person named Ctesibius of Alexandria found a way to make bronze springs stronger. He used a special mix of bronze and tin. Later, coiled springs appeared in door locks during the 15th century. This helped lead to the invention of spring-powered clocks and watches.

In 1676, a British physicist named Robert Hooke discovered an important rule. This rule is called Hooke's law. It says that the force a spring exerts is proportional to how much it is stretched. This means if you pull twice as hard, it stretches a predictable amount. In 1850, a man named John Evans started a business in New Haven, Connecticut. He was a Welsh blacksmith who moved to the United States in 1847. His company made flat springs for carriages and became a very old springmaker.

You can find springs in almost everything around you. They are inside the watches on your wrist to keep time. They are also used in car suspension systems to make rides smooth. Some springs, like the ones in a tape measure, help the metal band snap back. Even small battery contacts often use a tiny spring to stay in place. Springs turn simple movements into stored power that we can use every day.

A spring is a device made from an elastic but largely rigid material. Most modern springs are manufactured from spring steel.

However, non-metallic materials can also function as springs. A traditional bow made of yew wood is a non-metallic spring. When the bow is drawn, it stores energy to propel an arrow. Springs are essential because they can store energy in several ways. They can store energy when they are compressed, extended, or twisted.

When a conventional spring is moved from its resting position, it exerts an opposing force. This force is approximately proportional to the change in length. This relationship is known as Hooke's law. In 1676, British physicist Robert Hooke postulated this law. It states that the force a spring exerts is proportional to its extension. The rate of this force is called the spring constant. The spring constant is the change in force divided by the change in deflection. This value is the gradient of the force versus deflection curve.

Springs can be classified by how a load force is applied to them. A tension or extension spring is designed to operate with a tension load. This means the spring stretches as the load is applied. A compression spring operates with a compression load. This causes the spring to get shorter when loaded. A torsion spring works through a twisting force called torque. When a torsion spring is twisted about its axis, it produces torque proportional to the angle.

There are many specific designs for springs used in different machines. A coil spring, or helical spring, is made by winding wire around a cylinder. A balance spring, or hairspring, is a delicate spiral used in watches. A cantilever spring is a flat spring fixed at only one end. Leaf springs are flat springs used in vehicle suspensions. Some specialized designs include the volute spring, which is shaped like a cone. This shape prevents coils from pressing against each other during compression.

Humanity has used spring mechanisms for thousands of years. Simple non-coiled springs, like the bow, have been used throughout history. During the Bronze Age, more sophisticated devices like tweezers appeared. Ctesibius of Alexandria developed a method to make bronze springs stronger. He used an alloy of bronze with a higher proportion of tin. Coiled springs appeared in door locks during the 15th century. This led to the first spring-powered clocks. By the 16th century, these evolved into large watches.

In 1850, John Evans opened a business in New Haven, Connecticut. Evans was a Welsh blacksmith who emigrated to the United States in 1847. His company, John Evans' Sons, manufactured flat springs for carriages. It became known as "America's oldest springmaker" and still operates today. Springs are also used to manage electrical properties. Beryllium copper is used for springs that carry electric current. Other metals like titanium are used when a part needs corrosion resistance.

In physics, a spring-mass system can exhibit simple harmonic motion. This occurs when energy fluctuates between kinetic energy and potential energy. In an ideal system, the total energy remains the same. The potential energy depends on the spring constant and the displacement. The kinetic energy depends on the mass and the velocity. The period is the time it takes to complete one full cycle. The frequency is the number of oscillations that happen per unit of time.