Oh,,Physical,Physical,Physical,Physical

Power is the force that drives, and resistance is the force that prevents you from moving the object, such as the end of the lever you press with your fingers, and the fingers have a force on the lever to drive the lever to rotate, that is, power; At the same time, there is an object hanging on the other end, then that object has a force on the lever to organize its rotation, that is, resistance; When the lever is stationary, these 2 forces are the equilibrium force for the lever, and when the power is greater than the resistance, the fulcrum moment and other issues are not considered here.

If the lever is able to rotate around a fixed point under the action of force.

A fulcrum is a point that rotates around.

Power is the force that makes a lever turn.

Resistance is the force that prevents the lever from turning.

The power arm is the vertical distance from the fulcrum to the line of action of the power.

The resistance arm is the vertical distance from the fulcrum to the line of action of the resistance.

The action of force is mutual, and there must be resistance when there is motivation.

Very simple. Power: The force that makes a lever turn.

Resistance: The force that prevents the lever from turning.

You just have to look at the movement trend of the leverage (it doesn't have to move).

The same thing as the trend of the movement is the motivation.

The opposite of the movement trend is resistance.

These are all man-made regulations, and they are in line with living habits.

You just have to remember.

Lever: If it can rotate around a fixed point under the action of force, this hard rod is called a lever.

Fulcrum: The point at which the lever turns.

Power: The force that makes a lever turn.

Resistance: The force that prevents the lever from turning.

Power arm: The vertical distance from the fulcrum to the line of action.

Resistance arm: The vertical distance from the fulcrum to the line of action of resistance.

Because the action of force is reciprocal, there must be momentum and resistance.

The force that moves an object is the motive force.

The force that hinders the motion of an object is the drag.

In the issue of leverage.

The force that causes the lever to turn is the driving force.

The force that prevents the lever from turning is the resistance.

The other way around.

That force is useful to people, and it is customary to think of it as motivation.

You want that movement, that is the motivation, and the other is the help.

Resistance and momentum are a pair of reaction forces.

The force that hinders the motion of an object is the drag.

The force that helps in the motion of an object is the driving force.

What is useful to promote the completion of the work is motivation, and what hinders the completion of the work is resistance.

The force exerted by a person is generally a driving force.

Generally speaking, what does useful work is the driving force, and the reaction force of this work is the resistance.

First calculate the pressure of the plank on the ground: p1=12n, and then the pressure of the person on the ground: p2=6000-120=5880paThe gravity of the person is g=5880pa*

The mass of secondary school students was m=588n10=

The contact area of the human to the wooden board is: s2 = 200 cm2 2 = 400 cm2 = the pressure of the human to the wooden board is: p3 = 588n

p=f s so f=ps=600n

So the weight g = 600-12 = 588n mass = 588

His pressure on the plank p2=g s=588 =29400 pa

When R1 and R2 are connected in series, R1 and R2 are divided into pressure, R1 is divided, and R2 is divided. The current in the circuit is i=u r1+r2=

w1 =uit=

w2=uit=

Total work w = when r1 and r2 are connected in parallel, the voltages of r1 and r2 are equal, the current through r1 is i1 = and the current through r2 is i2 =.

w1=uit=6*

w2=uit=6*

Total work w=54+36=90j

Series: wr1: uit= wr2: uit= total work w= +

Parallel: wr1: uit=6* wr2: uit=6*total work w=54+36=90j