Question 2: Laws of Motion

Question

Assertion : A glass ball is dropped on
concrete floor can easily get broken
compared if it is dropped on wooden floor.
Reason : On concrete floor glass ball will take
less time to come to rest.

Accepted Answer

Both the assertion and the reason are true, and the reason is the correct explanation of the assertion.
When a glass ball is dropped on a concrete floor, it comes to rest in a much shorter time compared to when it is dropped on a wooden floor. The hard, rigid nature of concrete means that it does not deform much upon impact, causing a rapid deceleration of the glass ball. This rapid deceleration results in a large force being exerted on the glass ball due to Newton's Second Law of Motion :
$$ F = ma $$
where :
$ F $ is the force,
$ m $ is the mass of the glass ball,
$ a $ is the acceleration (or deceleration) of the glass ball.
Since the time to stop ($ t $) is shorter, the deceleration ($ a $) is higher. According to :
$$ F = m \frac{\Delta v}{\Delta t} $$
where $ \Delta v $ is the change in velocity, and $ \Delta t $ is the change in time, a smaller $ \Delta t $ results in a larger force $ F $.
On the other hand, a wooden floor may deform slightly upon impact, increasing the time over which the glass ball comes to rest. This longer time reduces the deceleration and, consequently, the force exerted on the glass ball, making it less likely to break.
Thus, the correct option is :
Option A
If both assertion and reason are true and reason is the correct explanation of assertion.

Answer

If both assertion and reason are true and reason is the correct explanation of assertion.

Answer

If both assertion and reason are true, but reason is not the correct explanation of assertion.

Answer

If assertion is true, but reason is false.

Answer

If both assertion and reason are false.

Laws of Motion

Assertion : A glass ball is dropped on concrete floor can easily get broken compared if it is dropped on wooden floor. Reason : On concrete floor glass ball will take less time to come to rest.

Choose the correct answer: