Labor saving levers Labor saving leverage, what are the labor saving levers?

Levers in life are not invisible, hehehehehehe.

Method: Think about the force you use and the effect you achieve. For example: car killing, can you use the force of the killer to kill the car outside, impossible, then it will save effort.

Compare the length of the power arm and the resistance arm.

The length of the power arm is the labor-saving lever.

The power arm is short, which is a laborious lever.

Levers in life:

Labor-saving: crowbars, wrenches, pliers, nail pullers, bottle openers.

Labor: arms, tweezers, fishing rods, chopsticks, tongs.

Equal arms: balances, seesaws.

Scissors are also levers, but there are labor-saving and labor-saving ones, and it is best not to use them as examples I hope you can be satisfied!

When the power point is far away from the fulcrum, it is a labor-saving lever.

When the power point is close to the fulcrum, it is a laborious lever.

When the resistance point is close to the fulcrum, it is a labor-saving lever.

When the resistance point is far away from the fulcrum, it is a laborious lever.

In short, being closer to the power point is labor-saving.

Being farther away from the power point is laborious.

It depends on whether the fulcrum is close to the power point or the resistance point.

My answer is the same as above. Use the long end to save effort, and the short end to labor.

In general, find the fulcrum first, and then look at the force arm. Divide the force arm into two from the fulcrum, and in order to balance, the force required for the short arm is larger, and the force required for the long arm is smaller. The formula is f1l1=f2l2 (f is the force used l is the force arm of the bearing force) Is the answer satisfactory, miss?

The short one you use is laborious.

The long one you use is labor-saving.

Laborious levers include scissors, chopsticks, arms, castanets, tweezers, leopards, iron gates, cranes, rods, sewing machine pedals, and paddles. Wait.

The lever balance condition is that the power multiplied power arm is equal to the force multiplied by the resistance arm, then under the condition of lever balance, the dynamic (f1) is greater than the force (f2), and the power arm (l1) is less than the resistance arm (l2), the lever is a laborious lever.

Laborious lever refers to a lever where the power is greater than the resistance and the power arm is smaller than the resistance arm.

The laborious lever can save the distance of the power movement, so that in the case of a small movement, the distance of another segment can be moved a lot, so as to achieve the intended purpose. In other words, although it is laborious, the distance of the dynamic movement is smaller than that of the resistance, and the distance is saved.

Extended Materials. Levers: Archimedes was the first to propose the principle of leverage in his book "On the Equilibrium of Plane Figures". He began by citing some of the practical experience of leverage"A self-evident axiom"Then, starting from these axioms, using geometry through rigorous logical arguments, the lever principle is derived.

The axioms are: (1) hang equal weights at the ends of weightless rods at equal distances from the fulcrum, and they will balance;

2) Hang unequal weights at the same distance from the fulcrum at both ends of the weightless rod, and the heavy end will tilt downward;

3) Hang equal weight at the two ends of the weightless rod at an unequal distance from the fulcrum, and the far end will be tilted down;

4) The action of one weight can be replaced by the action of several evenly distributed weights, as long as the position of the center of gravity remains the same. Conversely, several evenly spaced weights can be replaced by one suspended at their center of gravity; The center of gravity of the shape is distributed in a similar way.

Laborious lever refers to the lever that the power arm is shorter than the resistance arm, and there are many common laborious levers in life, such as:

Chopsticks: The finger-controlled arm is short, and the tip of the chopsticks holds the food with a long arm;

Fishing rod: the hand-held arm is short, and the arm of pulling the line is long;

Almost all muscles pull bones with laborious levers, such as wrist wrenching: the biceps tendon is focused on the base of the radius, the arm is short, and the arm at the wrist at the point of force is long.

Crowbars, wrenches, pliers, nail pullers, bottle openers, tin scissors, wire cutters, nail clippers, car steering wheels, etc., are labor-saving levers.

Tailor scissors, chopsticks, arms, fans, castanets, tweezers, spoons, iron gates, cranes, fishing rods, sewing machine foot pedals, paddles, scissors for barbers, clothes poles, etc., are laborious levers.

Labor-saving: crowbars, wrenches, pliers, nail pullers, corkscrews laborious: arms, tweezers, fishing rods, chopsticks, tongs, etc. Arms: balances, seesaw scissors are also levers, but labor-saving and labor-saving are available.

The lever with a power arm longer than the resistance arm is called a labor-saving lever;

The lever where the power arm is larger than the resistance arm is called the laborious lever;

The lever where the power arm is equal to the resistance arm is the equiarm lever.

Labor-saving levers: claw hammer, scissors for iron scissors, wrenches, pliers, wheelbarrows, shovels, moving pulleys.

Laborious levers: scissors for cutting cloth, brooms, tweezers, chopsticks, oars, sewing machine pedals, fishing rods.

Equal arm lever: balance fixed pulley.

Strenuous levers include: chopsticks, fans, tweezers, fishing rods, paddles.

1. Chopsticks. Chopsticks refer to the commonly used eating tools in China, usually made of bamboo, wood, bone, porcelain, ivory, metal, plastic and other materials. One of the symbols of Chinese food culture is one of the world's most common tableware, which was invented in China and later spread to Korean culture, Japan, Vietnam and other Chinese character cultural circles.

2. Fan. The fan is a wind-inducing product and a must-have for summer time. The traditional Chinese fan culture has a profound cultural heritage and is an integrated part of the Chinese culture, which is closely related to bamboo culture, Taoist culture and Confucian culture.

3. Tweezers. Niè zi is a tool used to pick up lumps of medicine, metal particles, hair, thorns and other small things. It can also be used for mobile phone repair, using it to clamp wires, components and integrated circuit pins.

4. Fishing rods. A fishing rod is a fishing tool in the shape of a long, slender and knotted rod, usually with a handle, which tapers and sharpens from the handle to the back end, and is used by connecting a fishing line to a hook with bait.

5. Paddle. Use oars to make the boat move forward, our country is the hometown of the "boat", but also the hometown of the oar. In the Neolithic period of the Hemudu culture more than 10,000 years ago, at the same time as the appearance of canoes, oars also came into being and quickly took shape. The paddles of that time were very different from the oars of today:

The grip is shorter, and the paddle board is narrow and long.

The lever balance condition is that the power multiplied by the power arm is equal to the resistance multiplied by the resistance arm, so under the condition of lever balance, when the power arm is smaller than the resistance arm, the lever is a laborious lever.

Common levers in life are: tweezers, fishing rods, chopsticks, tongs,

Laborious levers refer to: the force point is close to the fulcrum, and the resistance point is far away from the fulcrum, such as: fans, tweezers, fishing rods, chopsticks, paddles, etc., are some laborious levers.

Laborious levers include fans, tweezers, chopsticks, ordinary scissors, fishing rods, oars, wire clips, and more.

Examples of labor-saving levers are: crowbars, wrenches, pliers, nail pullers, bottle openers, wire cutters, nail clippers, bicycle pedals;

Common examples of strenuous levers are: chopsticks, arms, fans, castanets, tweezers, spoons, iron gates, cranes, fishing rods, sewing machine pedals, paddles, scissors for barbers, clothes poles.

Common examples of equal-arm levers are: balances, seesaws, Ferris wheels.

First, the nature is different.

1. Labor-saving lever, as the name suggests, has a longer power arm and less power, so it is labor-saving.

2. The lever balance condition is that the power multiplied by the power arm is equal to the resistance multiplied by the resistance arm, then under the condition of lever balance, the power (F1) is greater than the resistance (F2), and when the power arm (L1) is less than the resistance arm (L2), the lever is a laborious lever.

Second, the formula is different.

1. The formula f1l1=f2l2 can be obtained, and the longer the arm, the smaller the force.

2. Formula: l1 f1 = l2 f2, l1f2.

3. The examples in life are different.

1. Labor-saving levers: crowbars, wrenches, pliers, nail pullers, bottle openers, iron scissors, wire cutters, nail clippers, car steering wheels, etc.

2. Laborious levers: tailor scissors, chopsticks, arms, fans, castanets, tweezers, soup spoons, iron gates, cranes, fishing rods, sewing machine pedals, oars, scissors for barbers, drying clothes.

Labor-saving levers include: wrenches, bottle openers, bicycle pedals, nail clippers, pliers, nail pullers, crowbars, etc.

Laborious levers include: fans, castanets, tweezers, spoons, chopsticks, tongs, tweezers, fishing rods, etc.

Equal arm levers include: balances, seesaws, ferris wheels, fixed pulleys, etc.

Labor-saving lever: The power arm is larger than the resistance arm, and the power is less than the resistance when balanced. Features: Although it saves effort, it takes a lot of distance.

Laborious lever: The power arm is always larger than the resistance arm belt base, and the resistance is less than the power when balanced. Features: Although it is laborious, the dynamic moving distance is smaller than the resistance moving distance, saving the distance.

Equal arm lever: The power arm and resistance arm are the same length, which is neither labor-saving nor labor-saving, neither distance nor distance-saving.