The force of attraction of the earth on an object is known as the& x20; - RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

General Knowledge

Easy

Appeared in: RRB Nsg. Superintendent-21 July 2019 (Shift-2nd)

Explanation

The question asks for the term describing the Earth's force of attraction on an object.
This is the scientific definition of 'weight'.
Weight is a force, measured in Newtons (N), that results from gravity acting on an object's mass.
The formula W = m x g directly links weight (W) to the force of gravity (g) acting on mass (m).

Option B: Motion is the change in an object's position. It is a description of movement, not the force causing it.
Option C: Friction is a resistive force that opposes motion between surfaces in contact. It is not the force of attraction from the Earth.
Option D: Mass is the quantity of matter in an object. It is the property that gives the object weight in a gravitational field, but it is not the force itself. Mass is constant, whereas weight changes with gravity.

Visual 1: Diagram - An illustration showing the Earth with an apple falling towards it. An arrow labeled 'Weight (Force of Gravity)' should point from the apple towards the center of the Earth.
Visual 2: Comparison Chart - A side-by-side visual comparison of a beam balance (measuring mass) and a spring scale (measuring weight), highlighting how each works and what it measures.
Visual 3: Infographic - An infographic showing an astronaut on both the Earth and the Moon. It should state that their mass (e.g., 70 kg) is the same in both locations, but their weight is much less on the Moon (approx. 1/6th) due to lower gravity.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition of Weight and its distinction from Mass as background academic context rather than a clinical decision trigger.
While this is a physics concept, the distinction between mass and weight is critical in science and medicine. For example, medication dosages are calculated based on a patient's mass (in kg), not their weight, to ensure accuracy regardless of gravitational variations (though on Earth, the terms are often used interchangeably in a non-scientific context).
Understanding forces like gravity and friction is fundamental to biomechanics, which is essential for nurses when positioning patients, preventing falls, and understanding pressure injuries (SRC_4, SRC_5).
What if? If an object were taken to the Moon, its mass would remain unchanged, but its weight would decrease to about one-sixth of its Earth weight. This demonstrates that weight is dependent on the local gravitational field, while mass is an intrinsic property.

How to Approach the Question

First, identify the key phrase in the question: 'force of attraction of the earth'.
Recognize that this phrase is asking for the definition of a specific physical term.
Evaluate each option based on its scientific definition.
Option A, 'Weight', is defined as the force of gravity on an object. This directly matches the question.
Option D, 'Mass', is a close distractor. Recall that mass is the amount of matter, while weight is the force due to gravity acting on that mass.
Eliminate 'Motion' and 'Friction' as they describe different physical phenomena (change in position and resistive force, respectively).

Concept Tested & Keywords

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