Question

Answer this question pls

Answer 1

really sorry but I don't know the answer

Answer 2

Answer:

13.a) Sheet B will shine more because metals are Lustrous i.e. when they are polished or freshly cut they Shine.Here when the metal is rubbed with newspaper it has no effect but after rubbing it with sandpaper it will shine.

b) Pooja has to apply larger force as force is directly proportional to mass

14) Using trolley makes the work easier.Trolley are simple machines with wheels for reducing the force of friction. Dragging something over rough ground is hard work, but wheels make it much easier by allowing the object to roll along.

15) Wet marble floor < dry marble floor <newspaper < towel....is the increasing order of friction acting on the car

hope it helps u..

this is my own answer ...not copied

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