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Answers to Readers' Questions on Physical Science:

Machines

The following 2 comments and questions have been sent in. They are listed according to date.

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• What kind of motion is in a sewing machine?
• Using levers in health care

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What kind of motion is in a sewing machine?

Question

June 4, 2010

What kind of motion (linear or oscillatory) is shown by sewing machine?

Ramesh - Nepal

19839

Answer

A sewing machine usually has a wheel and shaft that are in rotating motion. The shaft turns a crank that moves the needle up and down in oscillating motion. The movement of the cloth under the needle is usually linear or straight line motion.

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Using levers in health care

Question

March 13, 2010

How does levers applied in health care provition?

abednego - Ghana

19364

Answer

There are many devices using levers in health care. The brake on a wheelchair uses a lever. Levers are used to adjust the level and inclination of a hospital bed. Levers are sometimes used to life heavy hospital equipment.

I am sure if you would be observant and look around where health care is being provided, you will see other examples of levers being used.

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