Matter And Materials 1 Flashcards Preview

Science gr5 term1,2 > Matter And Materials 1 > Flashcards

Flashcards in Matter And Materials 1 Deck (17)
0
Q

What are the properties of solids?

A
• They keep their own shape unless pulled twisted or bent.
• the particles are very close together.
• the particles cannot be compressed
• they have a fixed volume
1
Q

What states do most materials exist in?

A

Solids, liquids and gases.

2
Q

What are the properties of liquids?

A
• they do not keep their shape.They take the shape of the container they’re in.
• they flow.
• they are compressed with great difficulty.
• gravitypulls a liquid to the bottom of a container.
3
Q

What are the properties of gases?

A
• they do not keep their shape. They fill the container completely.
• they flow
• they can be compressed
• they have mass because they are affected by gravity.
4
Q

What are gases also known as?

A

Vapours

5
Q

How can the shape of an object be changed?

A

By using force.

6
Q

What are the basic forces?

A

Pushing and pulling

7
Q

When you push an object what are you doing?

A

Compressing it.

8
Q

When you pull an object what are you doing to it?

A

Stretching it.

9
Q

How can you change the direction of these pushing and pulling forces?

A

By twisting,bending or shearing.

10
Q

How do engineers use forces when they design buildings?

A

They use materials that can resist different forces so that the buildings do not collapse. Different materials have different properties and have different strengths . And they respond differently to the forces exerted on them.

11
Q

What properties do all materials have?

A

Hardness, toughness, stiffness,flexibility and strength under tension.

12
Q

What is hardness?

A

The property of a material to resist being scratched, cut or dented.

13
Q

What is toughness?

A

The measure of the strength of a material before it will break.

14
Q

What is stiffness?

A

It is a measure of how much a material will resist being bent.

15
Q

What is flexibility ?

A

How much a material can bend without breaking.

16
Q

What is strength under tension?

A

When a rope is stretched and pulled tight it is under tension.