Physics Ideas

13 examples of Newton’s second law in everyday life

In  Newton’s second law , known as the Fundamental Principle of Dynamics, the scientist states that the greater the mass of an object, the more force it will take to accelerate it. That is, the acceleration of the object is directly proportional to the net force acting on it and inversely proportional to that of the object.

We know that an object can only accelerate if there are forces on that object. Newton’s second law tells us exactly how much an object will accelerate for a given net force.

In other words, if the net force doubled, the object’s acceleration would be twice as great. Likewise, if the object’s mass doubled, its acceleration would be halved.

Examples of Newton’s Second Law in Real Life

Newton’s law applies to real life, being one of the laws of physics that most affects our daily lives:

1- kick a ball

When we kick a ball, we exert force in a specific direction, which is the direction it will travel.

Also, the harder the ball is kicked, the stronger the force we exert on it and the more it is.

2- Capture the ball manually

Professional athletes move their hands backwards when they catch the ball, as this gives the ball more time to slow down, as well as applying less force on your part.

3- Push a car

For example, pushing a shopping cart with twice the force produces twice the acceleration.

4- Push two cars

On the other hand, pushing two shopping carts with the same force produces half the acceleration because it varies inversely.

5- Push the same car full or empty

It is easier to push an empty shopping cart than a full one, as a full cart has more mass than an empty one, so more force is needed to push the full cart.

6- Push a car

To calculate the force needed to push the car to the nearest gas station, assuming we move a one-ton car around 0.05 meters per second, we can estimate the force exerted on the car, which in this case will be about 100 Newtons.

7- Drive a truck or car

The mass of a truck is much greater than that of a car, which means it requires more force to accelerate to the same extent.

When, for example, a car is driven 100 km on a highway for 65 km, you will certainly use much less gas than if you had to drive at the same speed for the same distance in a truck.

8- Two people walking together

The same reasoning above can be applied to any moving object. For example, two people who walk together, but one person weighs less than the other, even though they walk with the same amount of force, who weigh less go faster because their acceleration is undoubtedly greater.

9- Two people pushing a table

Imagine two people, one stronger than the other, pushing a table in different directions.

The person with the greatest strength is pushing to the east, and the person with the least strength to the north.

If we add the two forces together, we get a result equal to the table’s motion and acceleration. The table will therefore move in a northeasterly direction, albeit with a greater tilt to the east, given the force exerted by the strongest person.

10- Playing golf

In a golf game, the ball’s acceleration is directly proportional to the force applied to the club and inversely proportional to its mass. The path is influenced by air force which can cause a small change in its direction.

11- Open a door

When we open a door, we will have to carry out different forces depending on the material it is made from. Although it may have the same proportions, a greater force will have to be exerted on an iron sheet door compared to a wooden door.

12- Bicycle Pedaling

According to Newton’s law, the acceleration of a bicycle will depend on the force exerted. The more force, the more acceleration. Therefore, cyclists are generally very thin and professional bikes are very light.

13- Use a ketchup bottle

To extract the ketchup from the bottle, we must press it so that it comes out of the slit. Depending on the force applied, the ketchup can either come out slowly and land on the hamburger or come out at high speed and spread all over the plate.

Newton’s Laws

Isaac Newton (January 4, 1643 – March 31, 1727), an English mathematician and physicist famous for his law of gravitation, was a key figure in the 17th century scientific revolution and developed the principles of modern physics.

Newton first introduced his three laws of motion in the Principia Mathematica Philosophiae Naturalis in 1686.

Considered the most influential book in physics and possibly in all of science, it contains information on almost every essential concept in physics.

This work offers an accurate quantitative description of moving bodies in three basic laws:

1 – A stationary body will remain immobile, unless an external force is applied to it;

2- The force is equal to the mass multiplied by the acceleration and the change in movement is proportional to the applied force; 

3- For every action, there is an equal and opposite reaction.

These three laws helped to explain not only elliptical planetary orbits, but almost every other movement in the universe: how the planets are held in orbit by the force of the sun’s gravity, how the moon revolves around the Earth and the moons of the Earth. Jupiter revolves around it and like comets revolve in elliptical orbits around the sun.

The way almost anything moves can be resolved using the laws of motion: how much force it will take to accelerate a train, whether a cannonball will hit its target, how air and ocean currents move, or whether a plane will fly, are all applications of Newton’s second law.

In conclusion, it is very easy to observe Newton’s second law in practice, if not in mathematics, as we have all found empirically that it takes more force (and therefore more energy) to move a heavy grand piano than to slide a stool. in floor.

Or, as mentioned above, when catching a fast-moving cricket ball, we know it will do less damage if the arm is moved backwards while the ball is being caught.

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