I don t understand some of the questions about leverage

The part outside the force point and the part from the force point to the fulcrum point are only the force at the force point.

Here's an explanation of your original question, which you would have understood if you were in high school.

This is how the question should be explained.

The biggest feature of the lever is the fulcrum, which causes the angular velocity at both ends of the lever to be equal.

Now suppose there is a force f1 that does work on an object and moves a distance s1 (s1 is so small that circular motion can be equated with linear motion), and work done w1 = f1 s1

There is a lever with length L1+L2 and a fulcrum at L1 from one end.

Now with a vertical lever of magnitude f1, acting at one end from the fulcrum l1, through the lever to do work on the object, f1 still moves l1, and does work w2=f2 s2

Without taking into account losses: w1 = w2

f1×s1=f2×s2

f1×v1×t= f2×v2×t

f1×v1= f2×v2

f1×l1×w=f2×l2×w

f1×l1= f2×l2

I don't think the power arm makes any sense, it's just the ratio of the power arm to the resistance arm.

w1 must be equal to w2 because energy cannot be created and disappeared out of thin air.

In fact, it is all forced, for example, in your diagram, the left end is hung with a heavy object, and the right side does not give force but the rod is extended indefinitely, and eventually the lever will fall to the right (for example, you take a pencil under a ruler, the left end of the pencil part of the ruler is very short, the top square eraser, the right end of the ruler is very long, generally speaking, it will be like falling again) But if you do the problem, you generally do not consider the force and force of the rod.

In economics, leverage is the addition of borrowed currency to existing funds for investment；Leverage, the ratio of assets to bank capital. The rational use of the principle of leverage will help to accelerate the development and improve efficiency of enterprises and individuals, but there is also a risk that it will not be able to repay when due, and leverage is debt, and leverage ratio is the debt ratio. Financial leverage is simply a multiplier sign.

Using this tool, the final result of the uproar is a gain or a loss, which will increase in a fixed proportion.

Leverage. When one financial variable changes in a small increment, another related variable changes in a larger way. In other words, the change rate of earnings per common share generated by the use of debt financing methods (such as bank loans, bond issuance, and preferred shares) is greater than the change rate of EBIT.

In physics, a hard object that can rotate around a fixed point under the action of force is called a lever, and a hard rod that can rotate around a fixed point under the action of force is called a lever. Depending on the needs in life, levers can be made straight or curved.

A lever is a simple machine.

A hard rod that rotates around a fixed point under the action of force is a lever

The lever does not necessarily have to be straight or curved, but it must be guaranteed.

Levers in physics books.

It's a hard stick. Seesaws, scissors, wrenches, crowbars, etc., are all levers.

The pulley is a deformed lever, and the fixed pulley is an equal-arm lever, and the movable pulley is a lever that is twice the power arm and the resistance arm.

The fixed point at which the lever rotates is called.

The force by which the fulcrum makes the lever turn is called.

Motivation, (the point where the force is applied is called the point of action).

The force that prevents the lever from turning is called.

resistance, (the point where the force is applied is called the point of resistance).

When the rotational effects of the force and resistance on the lever cancel each other, the lever will be in equilibrium, and this state is called.

Leverage balance, but leverage balance is not a balance of forces.

The lever is balanced at a stationary or constant rotation.

A straight line in the direction of the force through the point of application of the force is called.

The line of action of the force.

The vertical distance L1 from the fulcrum O to the line of action of the dynamic F1 is called.

The vertical distance of the power arm from the fulcrum O to the line of action of the resistance f2 L2 is called.

Conditions for Balance of Resistance Arm Lever:

Power Power Arm = Resistance Resistance Arm.

Or write it as f1 l1=f2 l2

When levers are used, if the lever is stationary or rotates at a constant speed around the fulcrum, then the lever is in equilibrium.

Power Arm Power = Resistance Arm Resistance, i.e., L1F1 = L2F2, which can evolve to F2 F1 = L1 L2

The balance of the lever is not only related to the power and resistance, but also to the point of action of the force and the direction in which it is acted.

If the power arm is n times that of the resistance arm, then the power is 1 n of the resistance

Leverage principle. Big head sinks"

The longer the power arm, the less effort, and the longer the resistance arm, the more laborious.

Labor-saving leverage fee distance; Laborious lever saves distance.

The equal-arm lever is neither labor-saving nor labor-intensive. It can be used for weighing. For example; Balance.

leverage, which adds borrowed currency to existing funds for investment; Leverage, the ratio of assets to bank capital. The rational use of the principle of leverage is helpful for enterprises and individuals to accelerate their development and improve efficiency, but there is also a risk that they cannot be repaid when due. ”

For example, if you spend 500,000 yuan to buy a house of 2 million yuan, you can't buy a house with 500,000 yuan, but you buy it through a bank loan, which is equivalent to you using 500,000 yuan to leverage 2 million assets, which is leverage.

What are the following three types of leverage? What is it for?

The first type of leverage: saving effort, changing the direction of force; The second category: labor-saving, does not change the direction of the force; The third type of lever: saves distance and does not change the direction of the force.

Laborious levers and multiply distancesEffortful levers save distance, such as long shears for cutting hair.

What's the deal with changing direction? For example, if you use a crowbar to pry a heavy object, the gravity is downward, and to resist the force, you should use upward force, and if you use a crowbar, you can change it to downward force, so that people can work hard.

The weight of the 20 ox hangs on the thin end, and the point of gravity of the rod is on the other side of the fulcrum, and the whole lever is affected by these two vertical downward forces. If the gravity of the rod itself is regarded as the driving force, the force of the weight of 20 N is the resistance, and the distance between the place where the weight is hung and the fulcrum is 2m is the resistance arm.

Because there are unequal numbers of hooks on both sides just balanced, so if the left hook (G1) is close to O and the right (G2) is far away from O, L1 is smaller than L2 and G2 G1

Since both sides subtract the weight of g0, it is necessary to compare (g1-g0)l1 with l2(g2-g0), because g0 is subtracted, so (g1-g0) (g2-g0).

Because (g1-g0) (g2-g0), the left side sinks.

According to the principle of leverage equilibrium, g1*l1 g2*l2

l1＜l2g2＜g1

When both sides are far away from the length of L0, the left side of the lever = G1*(L1+Lo).

Leverage right = g2*(l2+lo).

Left-right = g1*(l1+lo)-g2*(l2+lo)=g1*l1-g2*l2+(g1*-g2)*l0 0

L1 is sinking this side.

You can use your brain to imagine or draw a diagram to hypothesize.

This question should be a short-answer question, and I don't think it's too cumbersome.

Hypothesis: There are 5 hooks on G1 and 1 tick on G2.

Lever o g1 away from o point 1 unit g2 away from o point 5 units has: 1 * 5 = 5 * 1 two hook codes at the same time outward translation 1 unit has: 2 * 5 is not equal to 6 * 1 2 * 5 > 6 * 1

If the two hooks are translating outward at the same time, 1 unit is: 3*5 is not equal to 7*1 3*5>7*1

And so on. So it will sink to the left.

If the lever is balanced after moving, then the left and right arms of the lever are l3 and l4 respectively, because f1*l1=f2*l2 , f1*l3=f2*l4, so l1 l3=l2 l4=m where m<1 (because l3 and l4 are far away from o).

Because l1 so l3 because now l3=l4

So tilt towards L3.

That is, to the left.

Valve operating force: 3cm x 5th power PA = 36 N.

B-point force: 36 Nt x oa ob = 9 N.

Mass: 9 N 10n kg =