Are Levers All Labor Saving Differences Between Labor Saving Levers and Labor Saving Levers

Leverage doesn't have to save effort, it can also save distance! In other words, the lever is to sacrifice force or distance, and save distance or force!

For example, the rocking stone is a typical low-effort lever!

The simple crane does not save effort, and it takes a lot of effort to move things a long distance!

No. The lever of the power arm is longer than the resistance arm.

The lever of the power arm is equal to the resistance arm and is effortless and effortless.

The lever of the power arm is shorter than the resistance arm is laborious.

Friction is not taken into account above).

No. The power arm is longer than the resistance arm, so it saves effort.

The resistance arm is longer than the power arm, so it is laborious.

No. Classification of leverage.

1.Labor-saving leverage.

Features: Labor-saving but a certain distance.

2.Laborious leverage.

Features: Laborious, but it must save distance.

3.Equiarm levers.

Features: No effort or distance.

No. The greater the distance between the fulcrum and the force point, the smaller the distance from the key point, and the more effort will be saved.

The smaller the distance between the fulcrum and the force point, and the greater the distance from the key point, the more laborious it will be.

Fulcrum, force point and focus:

For example, use a steel ruler to pry open a milk powder can, the place where the steel ruler is inserted into the lid of the milk powder can is the focus, the place where the steel ruler leans against the edge of the milk powder can is the fulcrum, and the other end of the steel ruler is the force point.

Leverage is divided into 1Labor-saving lever: The power arm is larger than the resistance arm.

2.Laborious lever: The resistance arm is larger than the power arm.

3.Equal arm lever: The power arm is equal to the resistance arm.

Therefore, compared with these three, the labor-saving lever is more labor-saving, the labor-saving lever is the most labor-intensive, and the equal-arm lever is in the middle.

However, although the labor-saving lever saves effort, the distance of the power movement is larger than the distance of the resistance movement.

Although the laborious lever is laborious, the dynamic moving distance is smaller than the resistance moving distance, saving the distance.

No, it depends on whether it is a labor-saving lever or a labor-intensive lever.

Not really. You can try to use your hands and look at it with your short arms.

No, the resistance multiplied by the resistance arm is equal to the power multiplied by the power arm, depending on whether the power arm is longer, if so, it will save effort.

No, it's a laborious lever that saves distance!

Of course not, it's hard to use the short end!

The difference between labor-saving lever and labor-effort lever is different in nature and formula.

1. The nature is different.

Labor-saving lever, as the name suggests, has a longer power arm and less power, so it saves effort; 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 is greater than the resistance, and when the power arm is smaller than the resistance arm, the lever is a laborious lever.

2. The formula is different.

The formula f1l1=f2l2 obtains, the longer the arm, the smaller the force. The lever of the male power arm greater than the resistance arm is the labor-saving lever and fiber rod; The lever where the power arm is smaller than the resistance arm is a laborious lever; The lever where the power arm is equal to the resistance arm is the equiarm lever.

The theorem of leverage

1. Hang equal weights at the two ends of the weightless rod at an equal distance from the fulcrum, and they will be balanced.

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 the same weight at the two ends of the weightless rod at an unequal distance from the fulcrum, and the far end will tilt downward.

4. The action of a heavy object can be replaced by the action of several evenly distributed heavy strips, as long as the position of the center of gravity remains the same. Based on these axioms, Archimedes discovered the principle of the lever, that is, when the two objects are in equilibrium, their distance from the fulcrum is inversely proportional to their weight.

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.

The distance from the line of action of the force to the fulcrum is called the force arm. According to the formula f1 l1 = f2 l2, the longer the arm, the smaller the force. Labor-saving lever, as the name suggests, has a longer power arm and less power, so it saves effort;

However, it is usually labor-saving, leveraging and effort-saving, and the distance will be correspondingly wasted.

The power arm is larger than the resistance arm, and the power is less than the resistance when balanced. It's labor-saving, but it takes a lot of distance.

Corkscrews, juicers, walnut tongs ...... in lifeThe power point of this lever must be close to the fulcrum point of the gravity force, so it is always labor-saving.

Such as: crowbars, wrenches, pliers, nail pullers, bottle openers, iron scissors, wire cutters, nail clippers, car steering wheels, etc.

Labor-saving lever: The power arm is larger than the resistance arm, and the power is less than the resistance when balanced.

It's labor-saving, but it takes a lot of distance.

Let the power arm be L1, the resistance arm be L2, and when L1 is greater than L2, it is a labor-saving bar.

Corkscrews, juicers, walnut tongs ...... in lifeThis leverage force point must be closer to the fulcrum than the key point, so it is always labor-saving.

Such as: pry beam or stick, wrenching slag hole hand, pliers, nail puller, bottle opener, wire cutter, nail clippers, etc.