Question 146: Centre of Mass and Rotational Motion

Question

Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$
Assertion A : An electric fan continues to rotate for some time after the current is switched off.
Reason R : Fan continues to rotate due to inertia of motion.
In the light of above statements, choose the most appropriate answer from the options given below.

Accepted Answer

The correct answer is Both A and R are correct and R is the correct explanation of A.
Explanation:
Assertion A
: An electric fan continues to rotate for some time after the current is switched off. This is a correct statement. When you switch off the fan, it doesn't stop immediately but continues to rotate for some time.
Reason R
: Fan continues to rotate due to inertia of motion. This is also a correct statement. Inertia is the resistance of any physical object to any change in its state of motion. This includes changes to the object's speed or direction of motion. An object will stay in its state of motion unless a force acts on it. In the case of the fan, after the current is switched off, the fan blades have inertia and continue to move due to this inertia until the frictional forces (like air resistance and friction in the fan's bearings) cause it to stop. Therefore, inertia of motion is the correct reason for the fan's continued motion after the current is switched off.

Answer

A is not correct but R is correct

Answer

A is correct but R is not correct

Answer

Both A and R are correct and R is the correct explanation of A

Answer

Both A and R are correct but R is NOT the correct explanation of A

Centre of Mass and Rotational Motion

Choose the correct answer: