Expansion and Contraction

Look at the diagram . Why there are gaps between metal connectors on bridge?

• To allow water flow through it rainy season

• To allow air flow during thunderstorm

• To allow the bridge to expand when the temperature of the surrounding increases

The gaps between the connectors on a railway track allow the track to expand when the temperature of the surrounding decreases .

• True

• False

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Electric cables are hung ............. between poles to allow the wires to contract when the temperature .................

• tightly , increases

• loosely , decreases

• loosely , increases

Look at he diagram what causes the bottle cap to pops off?

• Too much water in the bottle

• Too much air in the bottle

• The air in the bottle expanded when it gained heat.

Tags

NGSS.MS-PS1-4

How can he overlapping glasses be separated?

• Boiled the glasses in hot water

• Poured hot into upper glasses

• Put some ice cubes into the upper glass

Diagram shows an iron ball before heated and after heated.

Why the iron cannot pass the iron ring?

• he ring becomes smaller

• the iron ball expand when gaining heat.

• the iron ball contract after being cooled.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

The balloon ................... when air in the bottle gaining heat and ................. when the air in the bottle ............. heat.

• contracts, expanded

• expanded and contracts

Tags

NGSS.MS-PS1-4

Observe the diagram . Coloured water level ................ after being put in the hot water.

• falls

• risers

• remain the same

Tags

NGSS.MS-PS1-4

9. Based on the diagram, coloured water level falls because the air ................................ heat.

• loosing

• gaining

Tags

NGSS.MS-PS3-4

NGSS.MS-ESS2-6

The hot coffee becomes less heat after a few minutes. Why the hot coffee become cool?

• the heat from the hot coffee flows to surrounding from a .......... to ...... area.

• cold , hot

• hot , cold

• coffee ,spoon

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5