Newton's laws

Author: Matthew David

NEWTON'S LAWS

NEWTON'S LAWS OF MOTION

Let us begin our explanation of how Newton changed our understanding of the Universe by enumerating his Three Laws of Motion:-

First Law : An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

This law is often called    "the law of inertia".Example
You can remove a paper from beneath a standing clothes pin and the pin will fall into the container beneath it. Discover for Yourself:   Place an index card over the mouth of a heavy drinking glass or jar. Stand a clothespin on top of the card so that it is centered over the glass. Quickly and forcefully thump the card straight forward with your finger. You want only to hit the card and you want the card to move in a horizontal direction.Results: The clothespin falls straight into the glass about half of the time; the other half of the time it flips over landing upside down in the glass.

Reason :
Your finger applies force to the card, moving it forward. The card quickly moves out from under the clothespin and the pin falls straight down due to the pull of gravity. If you do not hit the card straight forward and/or it is not hit with enough force, the cards pulls the bottom of the pin forward and gravity pulls the top of the [pin down, causing the pin to flip before it lands.

Newton's Second Law

Second lawIf the net force on an object is not zero, the object will accelerate. The direction of the acceleration is the same as the direction of the net force. The magnitude of the acceleration is directly proportional to the net force applied, and inversely proportional to the mass of the object.
Force = mass x acceleration
F = maProblem :
A box with a mass of 40 kg sits at rest on a frictionless tile floor. With your foot, you apply a 20 N force in a horizontal direction. What is the acceleration of the box?
Ans.

The object is at rest, so there is no net force except for the force your foot is applying. Friction is eliminated. Also, there's only one direction of force to worry about. So this problem is very straightforward.

F = m * a

F / m = a

20 N / 40 kg = a = 0.5 m / s2

Newtons Third Law

Third Law

Each and every action has an equal and opposite reaction.

In the top picture, a physics student is pulling upon a rope which is attached to a wall. In the bottom picture, the physics student is pulling upon a rope which is held by the Strongman. In each case, the force scale reads 500 Newtons. The physics student is pulling  the same force in each case.

Newtons three law

Newtons three law changed the entire world. They are seen in our day to day life. In this article we are going to learn newtons three laws with some examples so that you understand it very easily.

Newtons First Law of newtons three law

This law states that if a body is at rest it will remain the same unless acted up on by some force and an object in motion continues to be in motion unless acted up on by some external force. This law is often called as Law Of Inertia.

This means that objects keep on doing what they do. Every object resists change of its state. If there is no force acting up on the body it will maintain its state of motion.

From the figure above we can see trolley is moving towards right. It continues to move, but it stopped when it hit a pole. So here pole is the object which put some opposite force on the trolley to change its motion.

This is all about first law in newtons three laws.

Newton's Second Law of newtons three law

This law states that when force is acted up on some body acceleration is produced. The greater the mass of the body the more the force is needed to accelerate the body. If F is the force applied, m is the mass applied and a is the acceleration produced then applied force = mass * produced acceleration.

This can be written in equation form as

                                                                F = ma            

Here force and acceleration are vectors and direction of force vector is same as direction of acceleration vector.

Example below explains you use of second law.

From the above figure we can three kids applying a force of N newtons. They want to accelerate a car weighing 1000 KGS at 1.0 m/s2 . Now by applying the formula F=ma

                                          N = 1000 * 1.0

                                             = 1000 newtons

So the force the three kids needed to apply is 1000 newtons.

This is all about second law in newtons three law.  Let us go to third law in newtons three law.       

Newtons Third Law of newtons three law

This law states that " For every action there is equal and opposite reaction". This tells that if you apply some force there will be equal and opposite force .

From the above figure we can see that rocket ejects gases with heavy force in down ward direction. This is the action. For this action rocket moves upward and this the reaction.

This is all about newtons three laws. Very easy naaaaaaa Koooooolllllllllll.....!!!!!!

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