Physics
Grade-9
Easy
Question
Which one of the following types of motion is possessed by the needle of a sewing machine?
- Circular motion
- Rotational motion
- Periodic motion
- Both rectilinear and rotational motion
Hint:
Oscillatory motion is defined as the to and fro motion of the body about its fixed position. Oscillatory motion is a type of periodic motion. Examples of oscillatory motion are vibrating strings, swinging of the swing etc.
The correct answer is: Periodic motion
In sewing machine used by tailors, the wheel exhibits rotational motion, the needle executes oscillatory or periodic motion and the cloth exhibits translation motion.
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Select topic sentence of below paragraph.
In the developing world, 1.1 billion people still do not have access to safe drinking water, 2.6 billion do not have access to adequate sanitation services, and waterborne diseases are responsible for more than 1.6 million deaths each year (mostly in children under five). Water is often too expensive or inaccessible to the poorest members of society in developing countries, while the wealthy have it piped into their homes. Furthermore, due to the infrastructure used to control water, entire seas are being lost, rivers are drying up, millions of people have been displaced to make room for reservoirs, groundwater aquifers are being pumped down, and water disputes have raised tensions from local to international levels. Fresh water is a scarce resource in many parts of the world, and it is expected to become even more so as the twenty-first century progresses.
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According to popular belief, while the dog is man's best friend, the coyote is his worst enemy. The coyote's bad reputation stems from his fondness for small animals; he hunts at night and is especially destructive to sheep, young pigs, and poultry. However, it is sometimes beneficial to coyotes. If valuable farm animals are protected, the coyote will frequently free the property of other animals, such as rabbits, which are destructive to the crops and certain trees. He is especially useful in keeping the rodent population under control. Where coyotes have been allowed to do their work without being harassed, ranchers and fruit growers have found them to be so valuable that they would not shoot them any more than they would shoot their dogs.
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