Hi friends,

You have to understand that there is a concept of physics with which you can interrogate and test as much as possible, so I do not rely on hypotheses.

kinetic energy

Your motor vehicle has kinetic energy, you increase the speed of your vehicle, the kinetic energy of your vehicle increases. The higher the kinetic energy of the vehicle, the greater the effort required to stop the vehicle. It is an important fact to know that kinetic energy increases exponentially, it means that if you double the speed of your vehicle, the kinetic energy of your vehicle increases four times. It also means that your brakes and stopping distance will also be doubled four times.

The work done on an object involves the force exerted on it, which according to Newton's second law can be related to the acceleration of the product. We will use this in the job definition:


Acceleration in turn implies a change in speed. One defines a quantity called the kinetic energy of an object as 


Where it can be shown


Kinetic energy (and as we will see below, all forms of "energy") have the work units, which are Joules. Therefore, the work done on each object goes into changing the kinetic energy of the object.


As an example, we can calculate the power of a 1000 kg sports car that can accelerate between 0 and 100 km / h in 10 seconds. In order to be able to get our calculation directly in Joules we first convert the speed to meters / second.


Then the work of the car engine is equal to the change in the kinetic energy of the car, we have it


The corresponding power in watts (unit of measurement of electrical power) is obtained by dividing the work done in Joules by the elapsed time, so that the power is 386,000 / 10 = 38,600 watts. In terms of horsepower, we see that the car has 38,600 / 746 = 52 hp in the car, most of the work is done by an engine that overcomes the friction and air resistance, so the 53 hp engine (horsepower) will not produce the type of acceleration mentioned in the example This is ideal.


Now that we know that work changes kinetic energy, we can give further interpretation to the idea of ​​negative work. Positive work performed on an object increases its kinetic energy as stated above, while negative work will decrease its kinetic energy. It also clarifies our previous example of negative work: if the vehicle deteriorates towards you and you push the vehicle against, it causes a slowdown in its speed and a decrease in its kinetic energy.


I hope in this way everything can be understood

Good Day....

Hi friends,

You have to understand that there is a concept of physics with which you can interrogate and test as much as possible, so I do not rely on hypotheses.

kinetic energy

Your motor vehicle has kinetic energy, you increase the speed of your vehicle, the kinetic energy of your vehicle increases. The higher the kinetic energy of the vehicle, the greater the effort required to stop the vehicle. It is an important fact to know that kinetic energy increases exponentially, it means that if you double the speed of your vehicle, the kinetic energy of your vehicle increases four times. It also means that your brakes and stopping distance will also be doubled four times.

The work done on an object involves the force exerted on it, which according to Newton's second law can be related to the acceleration of the product. We will use this in the job definition:


Acceleration in turn implies a change in speed. One defines a quantity called the kinetic energy of an object as 


Where it can be shown


Kinetic energy (and as we will see below, all forms of "energy") have the work units, which are Joules. Therefore, the work done on each object goes into changing the kinetic energy of the object.


As an example, we can calculate the power of a 1000 kg sports car that can accelerate between 0 and 100 km / h in 10 seconds. In order to be able to get our calculation directly in Joules we first convert the speed to meters / second.


Then the work of the car engine is equal to the change in the kinetic energy of the car, we have it


The corresponding power in watts (unit of measurement of electrical power) is obtained by dividing the work done in Joules by the elapsed time, so that the power is 386,000 / 10 = 38,600 watts. In terms of horsepower, we see that the car has 38,600 / 746 = 52 hp in the car, most of the work is done by an engine that overcomes the friction and air resistance, so the 53 hp engine (horsepower) will not produce the type of acceleration mentioned in the example This is ideal.


Now that we know that work changes kinetic energy, we can give further interpretation to the idea of ​​negative work. Positive work performed on an object increases its kinetic energy as stated above, while negative work will decrease its kinetic energy. It also clarifies our previous example of negative work: if the vehicle deteriorates towards you and you push the vehicle against, it causes a slowdown in its speed and a decrease in its kinetic energy.


I hope in this way everything can be understood

Good Day....