Question

Check Your Progress
1. Name three translucent materials.
2. Why does a toy rubber duck float on water but a
wooden one sink?
3. What happens if you put a piece of black paper on a
glass windowpane?
4. Name the material which can be hard or soft and
can float on water.
5. Write one instance where we replace wood with metal
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Answer 1

Answer:

1.glass, water, and air.

2.An object floats on water if its density is less than that of water. ... The object will sink if the upthrust is smaller than its weight. The rubber duck and fish floats because the weight of the water it pushes away is equal to the upthrust.

4.Therm- ocol box /Soft /Floats

Pen /Hard /Floats

Iron nail /Hard /Sinks

Glass marbles /Hard /Sinks

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Answer 2

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Ans. 1)

• Butter paper
• faded mirror
• Plastic bag

Ans. 2) Rubber Ducks can float on water because of their uripogial glands and the air in between there wings. Also because their bones are hollow making them light. While wooden block have heavy mass and less area, i.e, high density.

Ans. 3) The black paper absorbs all of the sunlight and converts it into heat, so the paper gets warm. The white paper reflects almost all of the sunlight, so the light is not.

Ans. 4) Many early cars used wooden members to reinforce the body structure. This article covers some of the issues involved with replacing the wood with metal.