Newton’s Laws of Motion | Definition & Examples
Let's start the introduction of "Newton’s Laws of Motion". After reading this article, you will be able to do all the questions about this topic. In this article, all three of Newton's laws of motion are discussed in detail with the examples.
At one time, the matter was known to be anything that occupies space and has mass but with upcoming of the understanding of Newton’s laws of motion developed a new fact about matter defining it to be anything that occupies space and has its own mass and inertia.
There are three Newton's Laws of Motion
Newton’s First Law of motion
According to Newton's First law of motion, Everybody continues in its state of rest or of uniform motion in a straight line unless it is compelled by some external force to change that state.
In other words, an object at rest remains at rest, or if in motion, remains in motion at a constant velocity that tends to retain its inertia until and unless acted on by a net external force. Newton’s first law of motion is also come to be considered as the law of inertia.
The external force is the force acting from outside on an object rather than the force from inside of an object. For instance, the force of gravity that exerts on the moon is the external force on the moon. However, the force of gravity that the inner core of the moon exerts on the outer crust of the moon is an example of internal force on the moon. Internal forces within an object can’t cause a change in the overall motion of that object.
The inherent property of a material body by virtue of which it cannot change, by itself, its state of rest or of uniform motion in a straight line is known as inertia.
It was Galileo who first asserted that objects move with constant speed when no external forces act on them.
The Inertia is of three types:
The tendency of a body to retain in its position of rest is known as the inertia of rest. It’s the ability of the body to resist any change in its state of rest such as
A person standing in a bus fall backward when the bus suddenly starts moving because the person initially at rest continues to be at rest even after the bus has started moving.
When a carpet is beaten with a stick, the dust particles fall vertically downward once they are released and do not move along the carpet before falling off.
A book on the table or a rock on the ground remains at rest until it is moved by some external agency applying the unbalanced force to displace it.
The tendency of a body to remain in its state of uniform motion in a straight line is known as the inertia of motion. For example,
When a passenger gets down from a moving bus, he tends to fall down in the direction of the motion of the bus.
An athlete running a race continues to run for some distance even after reaching the finishing line.
A passenger sitting in a moving car falls forward when the car stops suddenly. The belt used by the car driver is meant to prevent the same when the driver has to apply sudden brakes.
The swirling of milk in glass continues even after the stirring is stopped due to the inertia of the motion of the milk inside the glass.
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