Q1. Dust can be removed by beating a kantha or a blanket
with a stick, why?
Ans: Dust can be removed by beating a kantha or a blanket
with a stick because of the sudden application of force, which creates
vibrations and a rapid change in momentum. These vibrations and forces dislodge
the dust particles that are loosely attached to the fabric. As the fabric is
struck, it moves suddenly, and the inertia of the dust particles causes them to
separate from the fabric and fall away or become airborne, effectively cleaning
the item.
Q2. Spin bowlers bowl from almost a standing position, but
pace bowlers run from a distance. Why?
Ans: Spin bowlers bowl from almost a standing position, but
pace bowlers run from a distance because of the different techniques and
physical principles involved in their bowling styles:
Spin Bowlers:
Technique: Spin bowlers rely on their wrist and finger
movements to impart spin on the ball. The primary objective is to deceive the
batsman with the ball's spin and turn, which requires precise control and
subtle variations.
Position: Since the effectiveness of spin bowling depends
more on the rotational force rather than the linear speed, they do not need a
long run-up. A standing or short approach allows them to focus on the intricate
movements needed to spin the ball.
Pace Bowlers:
Technique: Pace bowlers aim to deliver the ball at high
speeds, often exceeding 140 km/h (87 mph). The speed of the ball is a crucial
factor in unsettling the batsman and inducing mistakes.
Position: To achieve such high speeds, pace bowlers need to
generate significant momentum. A long run-up allows them to build up this
momentum gradually. As they approach the crease, they convert their running
speed into the kinetic energy required for the fast delivery of the ball.
In summary, spin bowlers focus on precision and spin,
requiring less momentum, while pace bowlers focus on speed, requiring a longer
run-up to build the necessary momentum.
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