If there's a see-saw, there should be levers, and if there's a slide, there should be ramps. All of these devices use simple machines to convert linear movement into rotary motion. A swing uses a parallel pair of ropes or chains that are attached at their other ends to two objects that can rotate about separate axes (for example, two balls tied to each end of a piece of string). By pulling on the ropes or chains, you can cause the objects they're attached to to turn. Swings were often used in medieval times as instruments for measuring grain. The farmer would put out two buckets, one full and one empty, and then measure how much corn he had by how far the full bucket was from being level with the empty one.
Today, swings are most commonly used as children's toys. They're easy to make using rope and wood, and they work on the same principle as the instrument called a jack-screw which uses a series of interlocking parts—called screws—to provide lifting ability.
This describes what happens to a tree when wind blows across its limbs. The wind causes the branches to move back and forth, just like the arms of a child's swing.
Levers are the most common type of mechanical actuator. The term is applied to any device that converts energy from the manipulation of a lever into another form, such as mechanical power or an electrical signal.
A nail cutter is a tool used for cutting nails. It consists of a handle with a sharp blade attached to one end and a flat surface at the other end where you place your finger to pull the knife across it in a sawing motion. Nail cutters can be manual or electric. Manual nail cutters require physical effort from you to push down on the handle to create enough force to cut through a person's nails. Electric nail cutters use electricity to power a motor which in turn drives a blade that cuts through your nails.
Manual nail cutters are more powerful but also more labor-intensive than electric models. They can cut through up to three layers of skin, while electric models can only cut through two layers. Also, manual nail cutters require regular maintenance to remain effective. The blade needs to be replaced after every few uses because it will eventually dull if not done properly.
Lever The Leverage A lever is a lengthy instrument, such as a pole or a rod, that is used to raise an item. When paired with a fulcrum, the lever becomes more efficient. For example, if we were to connect a rope to the top of the pole and have someone stand under it, they could lift their body weight plus some amount of additional weight due to the effect of gravity on the rope (called "load"). In this case, the pole serves as a lever, because its length allows us to increase our lifting power over what we could do by hand alone.
For example, if I had a 1-meter-long pole and I wanted to be able to lift 100 N, then I would need a force amplifier of 100 N/1 m = 100 kg/m. This means that if I made a mechanical link between my hand and the top of the pole that is 100% efficient at transferring forces from my hand to the pole, then I could lift 100 N. But if the pole was only 1 m long, then I would need to find some way to fix the pole in place while I lifted it, because 100 N will break most poles within minutes. However, if I tied one end of the rope to the pole and the other end to my waist, then I have now created a lever where the pole is longer than my arm.
Levers aid in the lifting and moving of large weights. Seesaws, rakes, baseball bats, scissors, hammers, brooms, and even pencils are examples of levers. 8. When utilizing a lever, the effort is reduced if the fulcrum is near to the weight. This is called "nearness of the fulcrum to the load." 9. If the force acting on the lever is uniform throughout, then the distance between the point of application of the force and the fulcrum will be equal to one-half the length of the lever. 10. The power of a lever is the product of its two components: force times distance. For example, if you pull back on a rope with your arm fully extended, then you will be able to lift something heavy from the ground.
Lifting weights requires muscle force. The more muscle fibers you have using the maximum strength possible, the more weight you can lift. Muscle fibers are like strings on a violin; the more strings you have playing at once, the higher note you can play. Similarly, if you have many muscles working together, you can exert more force than if you were alone against an object. 11. Simple machines help us lift weights that we could not otherwise move. We need only to identify the right tool for the job.
There's the inclined plane, the wedge, the pulley, the lever, the screw, and the wheel and axle. These are called "simple" machines because they only use one part of any machine: weight, force, or momentum to do work. The modern playground is full of simple machines. An elevator is used to lift weights such as tires or balls. A teeter-totter is used for balancing people or objects back and forth. A seesaw can be used for playing games. A swing is used to lift someone into the air.
Simple machines were most likely first invented for use by farmers or builders who needed easy ways to lift heavy objects. But today their uses have been expanded to include play. The equipment found in playgrounds is designed to be fun and interactive for children of all ages. Simple machines are just as effective at play as they are at work. A child can enjoy pushing his or her body up an incline, swinging back and forth, or jumping on and off a device without doing any real physical work.
In addition to being fun, another reason why simple machines are included in playground designs is because they are easy to build. Any kid with some basic tools can put together most of these machines.
Similarly, one would wonder what kind of basic mechanism a seesaw is. A seesaw is a basic mechanism that belongs to the lever family. To move something, a lever is a long bar or stick that is pushed or pulled against a fulcrum. If you push on one end of a straight-armed lever, it will swing back and forth like a pendulum until it hits another object which stops it from moving further.
In other words, a seesaw is a device used for showing equal action at unequal distances from a central point of support. It can be used as a tool for demonstrating the principle of action and reaction.
There are two types of levers: straight-pull and curved-pull. The straight pull means that the force applied to the handle remains constant regardless of how far you lift it. With a curved pull, however, the force increases as you lift the handle farther away from the fulcrum. Curved pulls are more suitable for longer levers because they provide greater lifting power at the cost of less control. For example, a curved pull is used to lift a heavy load close to a wall without hurting yourself while a straight pull would break under the same circumstances.
Straight pulls are stronger than curved pulls because more of the weight of the lever is over a shorter distance making it easier to resist the force trying to bend the lever.