Question

15. What do you mean by the mechanical advantage
of a lever ?
16. Which class of lever has the mechanical advantage
always more than 1 ? Give an example.
17. Which class of lever has the mechanical advantage
always less than 1 ? Give an example.
18. Give one example of class I lever in each case
where the mechanical advantage is
(i) more than 1 (ii) equal to 1 (iii) less than 1.​

Answer 1

Answer:

bro the ans for the 15th one is

Explanation:

Mechanical advantage of a lever is equal to the ratio of the effort arm to the load arm. This is also called the principle of a lever.

Answer 2

Answer:

The mechanical advantage of a lever is equal to the ratio of the effort arm to the load arm. This is also called the principle of a lever.

16.class II

The mechanical advantage of class II levers is always more- than 1. Example – Nut cracker, wheel barrow, bottle opener etc.

17.class III

The mechanical advantage of class III levers is always less than 1. Example: a pair of tongs, sugar tongs, knife, forceps, etc.

18.more than 1: Load arm of pliers 2. equal to 1: See – saw 3. less than 1: The load arm of a pair of scissors.