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Newton

Primary Information
Secondary Information

Definition

In physics, a Newton (N) is the SI unit of force. It is named after Isaac Newton, the English physicist and mathematician who developed the laws of motion.

One Newton is the force required to accelerate a mass of one kilogram at a rate of one meter per second squared.

Mathematically, this can be expressed as:

  • F = ma
  • where:
  • F is the force in Newtons
  • m is the mass in kilograms
  • a is the acceleration in meters per second squared

For example, if you push a 1-kilogram block with a force of 1 Newton, it will accelerate at a rate of 1 meter per second squared.

Newtons are used to measure the force of gravity. The force of gravity on Earth is about 9.8 Newtons per kilogram.

Newtons are also used to measure the force of other objects, such as the force of a car's engine or the force of a person's punch.

How can the word be used?

Newton was born in Woolsthorpe, England, in 1643.

Newton

Different forms of the word

Noun: The unit of force in the International System of Units (SI).

Adjective: Relating to Newton or his work.

Derivative: Newtonian.

Etymology

The word "Newton" comes from the name of the English physicist and mathematician Isaac Newton (1643-1727). Newton is best known for his laws of motion and his law of universal gravitation.

The word "Newton" was first used in the 18th century to refer to the unit of force. The unit of force is named after Newton in recognition of his contributions to physics.

Question

What is measured in Newtons?

AQA Science Exam Question and Answer

Question:

What is the significance of Newton as a unit of force in physics, and how is it defined?

Answer:

The Newton (N) is a fundamental unit of force in physics, essential for quantifying interactions and motions in the natural world. It is named after Sir Isaac Newton, whose laws of motion revolutionised our understanding of force and motion. Newton is defined as the force required to accelerate a mass of one kilogram by one meter per second squared (1 N = 1 kg × 1 m/s²).

This unit is crucial because it provides a standardised way to express and compare forces across different contexts. For instance, when we push or pull an object, the force applied can be measured in Newtons, allowing us to precisely describe the impact of our actions. Engineers and scientists rely on this unit to design structures, calculate the effects of various forces, and predict how objects will behave under external influences.

In summary, the Newton unit serves as the building block for comprehending the fundamental concept of force in physics. Its definition as the force required for a specific acceleration allows us to quantify, measure, and analyse the effects of forces in a consistent and standardised manner across scientific and practical applications.