4. Write the answers to the following
questions in your own words.
(a) What is meant by
by simple
machines?
(b) Mention the advantages of using
a machine.
(c) What is meant by
meant by complex
machines?
(d) What is the lever ? How arethe orders of the lever determined?
Answers
Answer:
any of various elementary mechanisms formerly considered as the elements of which all machines are composed and including the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw
Answer:
a) A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force.
b) Small work is allocated to each worker to enhance speed, accuracy and efficiency. Work done is much easier for workers and production is faster when machines are used. When the machines are in good conditions, they are much more available and there is a great reliability that there will be production for the day.
C) Complex machines are also called compound machines. Two or more simple machines work together to form a complex machine. Compound machines can do more difficult jobs than simple machines alone. Examples of complex machines are bicycle, wheel barrow, crane, car jack, lawn mover etc.
d) Out of effort (E), Load (L) and Fulcrum (F), the one which is in between the other two determines the order of lever i.e. If L is in between F and E. It is of second order lever. If E is in between L and F, it is Illrd order lever
Explanation: