Revision class 8 science
3. Write short notes on:
A. Blog
B. Lysosomes.
C. Cell membrane.
D. Modern periodic law.
E. Sub-atomic particles.
F. Relative velocity.
G. Atmospheric pressure.
G. Metallic minerals.
G. Non-metallic minerals.
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simple machine
1. The efficiency of a simple machine is never 100%. The efficiency of a simple machine is never 100% because some of the input energy is lost due to friction and heat produced on a machine. Also, some energy is used to move the parts of machine. It means there will be less output work than input work.
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