Change in the velocity of an object per unit time is called \ \ \ \ \ \ \ \ \ \ & 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

Acceleration is defined as the rate of change of an object's velocity with respect to time.
The formula for acceleration is a = Δv / Δt, where 'a' is acceleration, 'Δv' is the change in velocity, and 'Δt' is the change in time.
It is a vector quantity, meaning it has both magnitude (how much the velocity changes) and direction.
An object is accelerating if its speed is increasing, decreasing (deceleration), or if it is changing direction.

Option A: Angular velocity is the rate of change of angular displacement, not linear velocity. It describes how fast an object rotates or revolves around an axis.
Option B: Angular displacement is the angle through which an object moves in a circular path. It is a measure of rotation, not the rate of change of velocity.
Option C: Displacement is the change in an object's position from a starting point to an ending point. It is a measure of distance and direction, not the rate of change of velocity.

Visual 1: Diagram: A simple diagram showing a car at three points in time: starting from rest (v=0), moving (v=10 m/s), and moving faster (v=20 m/s), with arrows indicating the increasing velocity and constant acceleration.
Visual 2: Graph: A velocity-time graph showing a straight, upward-sloping line, illustrating constant positive acceleration.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition of Acceleration in Physics as background academic context rather than a clinical decision trigger.
While a physics concept, understanding acceleration is foundational to biomechanics in healthcare. It helps in analyzing patient movements, the mechanics of falls, and the forces involved in traumatic injuries.
For example, the rapid deceleration in a car crash is what causes whiplash and other internal injuries. Understanding this helps in patient assessment and education on safety measures like seatbelts.
What if the question asked for 'change in position per unit time'? The answer would then be 'velocity', as velocity is the rate of change of displacement (position).

How to Approach the Question

This is a direct recall question testing a fundamental definition in physics.
First, break down the key phrases in the question: 'Change in velocity' and 'per unit time'.
'Per unit time' signifies a rate of change.
Therefore, the question is asking for the definition of 'the rate of change of velocity'.
Recall the definitions of the given options: displacement (change in position), velocity (rate of change of position), and acceleration (rate of change of velocity).
Match the definition from the question to the correct term, which is acceleration.

Concept Tested & Keywords

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