The speed is the speed of the object movement, that is, the speed is the size of the speed or equivalent todistanceRate of change.It is the ratio of the distance △ S passed by the moving object and the time △ t spent passing this distance.Namely (S1-S0)/(t1-t0), v=s/t
rateIt refers to the speed of the object movement, that is, the speed is the size of the speed or equivalent todistanceRate of change.It is called speed in junior high school physics, but it should be consistent withHigh School PhysicsThe speed in.
formula
It is the ratio of the distance △ S passed by the moving object and the time △ t spent passing this distance.That is, (S1-S0)/(t1-t0) v=s/t
difference
Speed is the ratio of distance to time, and speed is the ratio of displacement to time;Speed is a vector, with size and direction. It describes the speed of object movement and reflects the direction of object movement;Rate is scalar, with size but no direction.
Average rateDescribe the average speed of object movement over a period of time.The calculation method is v=△ S/△ t.average velocity：v=x/t。
Average speed is not "absolute value of average speed".Cannot be zero.
Because ifparticleWhen the object returns to the starting point in a period of time when it moves in a curve or a straight line with a round trip, the average speed during this period is zero, but the average speed is not zero.
In order to accurately describe the speed of object movement, take a very short time period Δ t. If Δ t is very, very small, it can be considered that Δ x/Δ t (displacement ratio time) represents the speed of the object at time t. This speed isInstantaneous velocity。Instantaneous speed is a vector, which is the ratio of displacement to time. It has a direction (the direction of object movement). The magnitude of instantaneous speed is also called instantaneous speed.
The rate is usually expressed in absolute terms.The V in the V-t image we learned in junior high school is speed by default in junior high school, but it means speed in senior high school.
The vehicle speedometer cannot display the direction of vehicle movement, and its reading is actually the speed of the vehicle."Speed" in daily life, primary school and junior high school physics refers toAverage rateAverage speed refers to the ratio of physical travel distance to time, whileaverage velocityMeansdisplacementRatio to time.
one-wayUniform linear motionThe average speed is equal to the instantaneous speed, the average speed is equal to the instantaneous speed, and the speed is equal to the speed.[1]
Digital concept
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The rate is also the number of frames that the digital camera built in the video conference product can transmit in one second. Since the pixel of the camera sensor used in the video conference system is not very high, the rate is concentrated between 15 frames/second and 30 frames/second, and this rate is enough to meet the needs of the products in the video conference.
Chemical concept
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The rate is also a chemical reactionSpeed (average reaction speed), usingAmount of reactants or products per unit timeTo represent.stayConstant volumeOfReaction vesselMedium,usuallyuseWithin unit timereactantReduction of concentration or increase of product concentrationTo represent.Expression: △ v (A)=△ c (A)/△ tUnit: mol/(L · s)Or mol/(L · min) affects chemistryreaction rateFactors: main factors: nature of reactants, external factors: temperature, concentration,pressure, catalyst,light, laser, reactant particle size, contact area between reactants and reactant state.In addition,X ray，Gamma rayThe surface area of solid materials, the contact area with reactants, and the concentration of reactants also affect the chemical reaction rate.
The chemical reaction rate is related to the catalyst.
