There are two point charges. The absolute value of the charge quantity is Q. take the charge quantity of △ Q from one charge and add it to the other charge, then the interaction force between them is compared with the original () A. It must be larger B. it must be smaller C. It remains unchanged D. because the electrical properties of the two charges are uncertain, it is impossible to judge

There are two point charges. The absolute value of the charge quantity is Q. take the charge quantity of △ Q from one charge and add it to the other charge, then the interaction force between them is compared with the original () A. It must be larger B. it must be smaller C. It remains unchanged D. because the electrical properties of the two charges are uncertain, it is impossible to judge

According to Coulomb's Law: the original force F1 = kq2r2, take off the amount of charge of △ Q from one charge and add it to the other charge, then according to Coulomb's Law: F2 = K (Q − Δ q) (Q + △ q) R2 = Q2 − (△ q) 2r2, so F2 < F1, so choose B

The distance between the centers of the two balls is 3R. If the Coulomb force between the two balls with the same charge q is F1, and the Coulomb force between the two balls with the same charge Q and - Q is F2, then ()
A.F1> F2 B.F1

Different charges attract each other, which makes the distance closer than the same charge, so the Coulomb force is larger

The correct understanding of acceleration is ()
A. If the acceleration value is large, the velocity can be very small. B. if the acceleration value is large, the variation of velocity must be large. C. if the acceleration value is large, the velocity can be reduced quickly. D. if the acceleration value is small, the velocity of the object will be reduced

A. B. according to a = △ V △ T, the acceleration is very large, and the change of speed is not necessarily very large. So B is wrong. C. the acceleration is very large, and the change of speed is very fast. If the direction of acceleration is opposite to the direction of speed, the speed decreases very fast. So C is correct. D. when the direction of acceleration is the same as the direction of speed, add When the speed decreases, the speed still increases. So D is wrong. So select: AC

Some concepts of basic physical quantities
How big is 1n? How long is 1m? How big is 1pA? How long is 1 second? How big is 1 candela?
For example, some people step 0.8 meters, which is a specific concept

The weight of two eggs is about 1n
There is no need to explain the 1 meter. It's almost a big step forward
1 pa is very small. When you reach 1 meter deep, the water pressure is already 10000 Pa. 1 mm deep water can produce 1 PA pressure
Candela is probably the intensity of candlelight

What is the meaning of physical quantity in science

Physical quantity is the measurement of some physical quantities with units
You can express the amount of matter in an object as mass
Length is the length of an object
Speed, a physical quantity, represents how fast an object moves!

Pressure is the physical quantity reflecting the action of force (). In physics, the pressure on () is defined as pressure

Effect unit area

Pressure is the physical quantity of the effect of pressure. Is the pressure the same//
In other words, does pressure describe the deformation degree of pressure? Because it is said in the book that pressure is the physical quantity describing the effect of pressure

The definition of pressure is: one is the force that the object bears perpendicular to the surface, and the other is the force to subdue people. From the first definition, we can see that pressure is originally a concept in physics, that is, when a force acts on an object, the stressed object will produce deformation, which is called pressure

What is pressure? Direction of pressure? Physical meaning of pressure. Definition of pressure
1. What is pressure? 2. Direction of pressure? 3. Physical meaning of pressure. 4. Definition of pressure
Not too long!

In physics, the force that presses vertically on an object is called pressure
The direction of pressure is perpendicular to the contact surface
In physics, the force on the unit area of an object is called pressure. The unit is Pascal, or simply Pascal. 1pA = 1n / m2. The physical meaning means that the pressure on the object per square meter is 1n

Objects______ What's wrong with you_____ It's called pressure. Its physical meaning is to express pressure______ The physical quantity of the system
The sign of pressure is_____ The unit of pressure is_____ The symbol of the area under force is______ The unit of force area is______ The sign of pressure is______ The unit is______ For short______ .

Objects__ Unit area____ What's wrong with you_ Pressure____ It's called pressure. Its physical meaning is to express pressure__ Pressure deformation effect____ The sign of pressure is__ F___ The unit of pressure is___ N__ The symbol of the area under force is__ S____ The unit of force area is___ Square meter___ The sign of pressure is__ P____ , single

The pressure is expressed as______ Physical quantity

Definition of pressure: pressure on unit area formula of pressure: P = Fs from the definition and formula point of view, the size of pressure is related to the size of pressure and stress area, pressure is expressed by the two physical quantities of pressure and stress area, so pressure is a physical quantity reflecting the effect of pressure. So the answer is the effect of pressure