Question

Which of the following safety features are used in vehicles to reduce the negative effects of inertia?
(i) Safety seat belts
(ii) Automatic air bags
(iii) Absorber bumpers
A. only (i) and (ii)
B. Only (ii) and (iii)
C. Only (i) and (iii)
D. (i), (ii) and (iii)

Answer 1

Hint : As a very first step, one could read the question along with the given options. Then, recall the concept of inertia and also the negative impacts it can have in the mentioned situation. Thereby, find which among the given options reduces the negative impacts of inertia and how.

Complete step-by-step solution:
In the question, we are given some options that are certain features of a vehicle. We are supposed to find the ones that are used so as to reduce the negative effects of inertia.
All three of them, be it safety seat belts, automatic air bags or absorber bumpers, all of them are used as a way to reduce the negative impacts of inertia.
Now in order to understand this, you should know what the negative impacts of inertia are.
Effect of inertia is basically the force acting over a time. So, on increasing the time of impact the negative effects of inertia are reduced. All three of the mentioned features increase the time of impact and hence reduces the negative effects of inertia.
Option D is found to be correct.

Note: Inertia can be defined as the property of the matter by virtue of which the body continues its state of rest or of uniform motion until and unless disturbed by an external force. This concept is described by the first law of motion. ‘An object that is not subjected to any net external force would move with constant velocity.