Uses of Everyday Materials：练习题

Why is metal often used to make cooking pans?

Which material would be least suitable for making a bridge that cars drive over?

A scientist wants to design a new bouncy ball. Which property is most important for the material she chooses?

Which material is waterproof and would be best for making a raincoat?

Which of these materials would be most suitable for making a window?

Which material would be best for making a waterproof raincoat: paper, fabric, or plastic?

Explain why a glass bottle is better for holding hot soup than a paper bag.

Objects are made from different materials. Fill in the blanks:
a) A window is usually made of ______ because it is transparent.
b) A spoon is often made of ______ because it is strong and does not melt easily.
c) Why is rubber a good material for making rain boots?

A scientist is testing different materials to see which one is the most flexible.
a) Define what 'flexible' means.
b) If you have a wooden ruler, a plastic ruler, and a piece of string, which one is the most flexible?
c) Explain why a glass bottle would be a bad choice for a baby's toy if they might drop it.