Question

1. Which of the following do not belong to the same class?
(a) inclined plane
(b) wedge
(c) pulley
(d) screw
2. The output energy of a real life machine is less than input energy because of :
(a) moving parts of machine
(b) friction at the moving parts
(c) both (a) and (b)
(d) none of these​

Answer 1

Answer:

1.Wedge is the answer of the question as lever,screw and inclined plane belong to class 1 lever.

2.Because some of the work input to a machine is always used to overcome friction, the work output of a machine is always less than the work input.

hence (C) will be right answer

Answer 2

1. (a) inclined plane.

2. (c) both (a) and (b).

may its helpful for u dear :)

thnku ✌❤✌