1. The first chapter is the summary of the notes of physics knowledge required for Grade Two in Senior High School.
The relationship between speed and acceleration is 1, and there is no necessary relationship between speed and acceleration, that is:
(1) When the speed is high, the acceleration is not necessarily high;
(2) The acceleration is large, but the speed is not necessarily large;
(3) When the speed is zero, the acceleration is not necessarily zero;
(4) When the acceleration is zero, the velocity is not necessarily zero.
2. When the relationship between acceleration a and speed v is determined, there are:
(1) If A and V are in the same direction, then V will increase no matter how A changes.
(2) If the directions of A and V are opposite, then no matter how A changes, V will decrease.
2. Summary of notes on physics knowledge of compulsory three in senior two.
1, particle: in the process of studying the motion of an object, if the size and shape of the object can be ignored in the studied problem, the object can be simplified to a point and the mass of the object is concentrated at this point, which is called a particle. 2. frame of reference: any movement is relative to a reference object, which is called a frame of reference.
3. Coordinate system: Coordinate system is used to describe the movement quantitatively.
4. Time and time interval:
The reading indicated by the clock corresponds to a certain time, that is, the time, and the time corresponds to a certain point on the time axis. The interval between two moments is called time, and time corresponds to a segment on the time axis.
The unit of time and torque is seconds, the symbol is s, and the commonly used units are min and h.
5. Distance: the length of the object trajectory.
6. Displacement: indicates the change of the position of the object. It can be represented by a directed line segment from the starting point to the end point, which is a vector. The displacement is less than or equal to the distance.
7. Speed: Physical meaning: indicates the speed at which the position of an object changes.
Classified average speed: the ratio of the displacement passed by an object to the time taken.
Instantaneous speed: the speed at a certain moment (or a certain position).
The difference and connection between speed and speed is vector, and speed is scalar.
Average speed = displacement/time, average speed = distance/time. The instantaneous velocity is equal to the instantaneous velocity.
8. Physical meaning of acceleration: It indicates the speed at which the speed of an object changes.
Definition: the acceleration of an object is equal to the ratio of the change of the object's velocity (vt-v0) to the time taken to complete this change. A = (vt-v0)/t (that is, equal to the rate of change of speed) A is not determined by △v and T, but by F and M. Direction: the same as the direction of speed change, but uncertain with the direction of speed. (or in the same direction as the resultant force)
3. Senior two compulsory three physics knowledge notes summary three
The utilization rate of static electricity is 1. According to the nature that electrostatic energy attracts light and small objects and the principle that like charges repel and opposite charges attract, the main applications are as follows:
Electrostatic copying, electrostatic dust removal, electrostatic painting, electrostatic flocking, electrostatic spraying, etc.
2. The application of electric field generated by high-voltage static electricity includes:
Electrostatic preservation, electrostatic sterilization, crop seed treatment, etc.
3. Ozone generated by electrostatic discharge and aseptic disinfection.
Lightning is a large-scale electrostatic discharge phenomenon in nature, which can produce a lot of ozone, and can synthesize ammonia from nitrogen in the atmosphere to supply plants with nutrition.
4. Senior two compulsory three physics knowledge notes summary four
* * * Force balance point 1. * * * Point force: several forces acting on the same point of an object, or the lines of action intersect at one point;
2. Equilibrium state: the state in which an object keeps moving in a straight line at a uniform speed or at rest is called equilibrium state, that is, the state in which the acceleration is equal to zero;
3. The equilibrium condition of an object under the action of * * * point force: the resultant force acting on the object is zero, that is, ∑F=0. If the equilibrium problem is solved by orthogonal decomposition method, the equilibrium conditions should be: ∑Fx=0, ∑ FY = 0;
4. Common methods to solve the balance problem: isolation method, integral method, graphic method, triangle similarity method, orthogonal decomposition method, etc.
5. Summary of Physics Knowledge Notes of Compulsory Grade Three in Senior Two
Decomposition of force 1, decomposition rule: parallelogram rule or triangle rule,
2, decomposition principle: according to the actual effect of decomposition
3. Decompose the known force into two components
(1), knowing the directions of the two components, find the size of the two components.
② Know the size and direction of one component and find the size and direction of another component.
4. resultant force and component force are "equivalent substitution".
6. High school compulsory three physics knowledge notes summary six
Concept of electric potential (1) definition and definition formula
The ratio of the potential energy of a point charge to its electric quantity in an electric field is called the point potential.
(2) Unit of potential: Volt (V).
(3) The potential is scalar.
(4) Electric potential is a physical quantity reflecting the energy properties of electric field.
(5) Zero potential point
The specified point with zero potential is called zero potential point. In theoretical research, infinity is usually taken as the zero potential point, and in practical research, the earth is usually taken as the zero potential point.
(6) Potential is relative.
The value of potential is related to the choice of zero potential point, and the potential value of the same point is different with different choice of zero potential point.
(7) The potential is getting lower and lower along the electric field line. The direction of electric field intensity is the direction of the fastest potential drop.
(8) Relationship between electric potential energy and electric potential: ε=qU.