Question

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Answer 1

Answer:

a) Friction- ii) reduces mechanical advantage

b) Principle of a lever-

c) See-saw- iii) load and effort both are in opposite direction

d) Bottle opener-

e) Spade- iv) class three lever

f) Spanner- viii) used to open a tight nut

g) S.I unit of work- vi) joule

h) Mechanical advantage- i) load x load arm= effort x effort arm

i) tongs, scissors - x) simple machines

j) truck, sewing machine- ix) complex machines