Why is f equal to ma

Why is f equal to ma

When the force is applied to the same object, the magnitude of the force is directly proportional to the acceleration generated. When the same force is applied to objects with different masses, the acceleration generated is inversely proportional to the mass of the object, so f = ma

When the speed of the object is maximum, the resistance is equal to the tractive force. Can the tractive force be calculated by F = ma?

No, it's at the maximum speed, which means it's moving at a constant speed and there's no acceleration. It should be f = f = μ mg

When calculating the combined external force, why is f-f = ma? When calculating the combined external force, why is gravity and supporting force not included
When a cart with a mass of 30kg on a flat road is subjected to a horizontal thrust of 60N, the acceleration is 1.5m/s #. If the cart is pushed, what is the acceleration of the cart? Excuse me: when calculating with combined external force, why not calculate gravity and supporting force?

In fact, it's force analysis, mainly to get the size of the resultant force. It's not always said that. The vertical direction is balanced, so only the horizontal direction is combined with the external force

The meaning of the element symbol is --——

Represents an element
An atom representing this element

What are the meanings of the numbers around the element symbols?
For example, in the upper left corner and lower left corner, what do the numbers represent?

The upper left corner represents the atomic weight, generally the relative atomic mass
In the upper right corner is the charge number, which is generally used for ions. The single substance is written as 0, but it is rare for Cu ions to be 2 +. The number is written in the front, and the charge property is written in the back
The lower left corner represents the atomic number, which is also the nuclear charge number. For example, C is 6
For example, the s with + 6 valence is written before the positive and negative, and the number is written after the number
The lower right corner is the number of atoms. For example, hydrogen is H2
On the left and the same size as the sign of the element are the numbers. For example, 2C stands for two carbon atoms
Send me a message if you don't understand

What does the element symbol mean

There are two meanings of element symbol: 1. Macroscopically, it represents an element; microcosmically, it represents an atom of this element; 2. For substances directly composed of atoms, it can also represent this simple substance

The representation and significance of element symbols
There are two

A preliminary study on the meaning of element symbols [author] Xie Hongyan's chemical symbols and their rules of use are unique words in chemistry. They are important tools for chemical science to study the composition, structure and change law of substances. They are the basis for our study of chemistry. From the beginning of junior high school chemistry, we should attach importance to and do a good job in the teaching of chemical terms, so that students can learn

What do you mean MC on the thermometer

There's a big C outside with MC
The full name is
China Metrology Certification
China Metrology Equipment Certification
This is the minimum requirement for measuring equipment
The product conforms to the national standard

What is the symbol C on the thermometer
Physics problem, help!

The unit of the measured data is centigrade
Because in addition to the centigrade scale, there is also the Fahrenheit scale, in degrees Fahrenheit
In the field of astronomy and other scientific research, the thermodynamic temperature scale is used
Thermodynamic temperature scale is also called Kelvin temperature scale, or absolute temperature scale, with the symbol K
……
You see, if so many temperature scales are not marked with a C, how can we know the unit of the measured data?

The symbol ℃ on the thermometer indicates what temperature is used

Centigrade