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A heavy ball is suspended as shown in the figure given above. A quick jerk on the lower string will break that string but a slow pull on the lower string will break the upper string. The first result occurs because:

A heavy ball is suspended as shown in the figure given above. A quick jerk on the lower string will break that string but a slow pull on the lower string will break the upper string. The first result occurs because: Correct Answer The ball has inertia

CONCEPT:

NEWTON'S LAWS OF MOTION

FIRST LAW OF MOTION

A body at rest remains at rest, and a body in motion will remain in motion unless an external force is applied.

SECOND LAW OF MOTION

Force acting on a body is equal to the mass of that body times its acceleration.
F = ma.

THIRD LAW OF MOTION

For every action, there is an equal and opposite reaction.

 

EXPLANATION:

Let the mass of the ball is m.

For lower string,

When we apply a force ‘F’ on the lower string, it create the tension T­­­1 in the string, and the ball started to apply a reaction force (the ball has inertia force), which is greater than the tension of the string and break down the string.

For upper string,

When we pull the lower string gently the tension ‘T’ appears in the upper string,

T = mg + F,

Then the net force is greater than the tension of the string so, it breaks down.

So, the ball has mass and has inertia to keep itself in rest and oppose the motion.

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