c. Statements given below are incorrect. Write the correct statements. 1. The resistance overcome by a machine is called friction 2. A machine which lifts more load than effort applied has efficiency more than 1. 3. An ideal machine is possible in real life. 4. The force applied on a machine to do some mechanical work is called pressure. 5. The ratio between input energy and output energy is called efficiency of machine.
Answers
Answer:
Correct option is C)
The solution to this problem is as follows,
A. In a simple machine, the input energy is not always equal to output energy as if it is moving there is friction between parts. If it is rotating it has to overcome air resistance. If it is a heat engine we can not extract all heat some is lost to the atmosphere. Hence A is False.
B. In Ideal machanical advantage we have,MA=
F
in
F out78
And ideally F
out
≥F
in
but in Actual machines the F
out
<F
in
, as friction and Air resistance comes to play. Hence B is False.
C.Velocity ratio is defined as the ratio of displacement of effort to the displacement of the load. Hence C is correct.
D. The mechanical advantage of a single pulley is always less than 1 as F
out
<F
in
As some work is produced in overcoming the force of friction. Hence D is also False
Mark as brainlist
Answer:
a not
b not more
c not
d pressure
e energy