D. Answer the following questions.
1. What is the importance of machines in our life?
2. What is simple machine?
How has invention of wheel benefitted the humans
4. How is wedge useful in our daily activities?
5. Define the three classes of levers. What is the diffe
6. Why is using a screw better than using a nail?
Activity Time
Answers
Answer:
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Answer:
1. What is the importance of machines in our life?
•Machines are very important to a person. Machines bring prosperity and happiness. It is used for addition , substraction , infact , all the mathematical work. They are used in house and offices both.
2. What is simple machine?
•any of the basic mechanical devices for applying a force, such as an inclined plane, wedge, or lever.
3. How has invention of wheel benefitted the humans?
•Early men used the wheel to move heavy objects, as a means of transport & for pottery. People even today make great use of this invention. The invention of the wheel brought about new ways of doing things. This made work easier and inspired even more new ideas for inventions.
4. How is wedge useful in our daily activities?
•A wedge is the sharp edge of an inclined plane and can be used for a number of purposes. Wedges are used to hold doors open, separate surfaces and even out structures. Knives, axes, and other sharp objects are also wedges, but their handle makes them a wedge/lever combination.
5. Define the three classes of levers. What is the difference?
•There are three types or classes of levers, according to where the load and effort are located with respect to the fulcrum. Class 1 has the fulcrum placed between the effort and load, Class 2 has the load in-between the effort and the fulcrum, and Class 3 has the effort between the load and the fulcrum.
6. Why is using a screw better than using a nail?
•When deciding between nails and screws, keep in mind that nails are less brittle, so they provide greater shear strength. ... Screws, on the other hand, may not be as forgiving, but their threaded shafts hold better in wood and draw boards together much more tightly and they have greater tensile strength.
Explanation:
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