6.P.3.3 - Expansion/Contraction

When objects absorb heat, the particles...

• gain energy and vibrate at fixed position.
• gain energy and increase in size.
• gain energy and move slower.
• gain energy and move faster.

When objects contract upon cooling...

• volume increases and density increases.
• volume increases and density decreases.
• volume decreases and density decreases.
• volume decreases and density increases.

When an object expands, its _________ increases.

• mass
• volume
• shape
• size 

Objects gain heat and _________. 

• expand
• contract

A bimetallic strip (strip made of 2 different types of metal) was heated as shown.
What does this experiment tell us about effects of heating different types of metal? 

• Metals strip A and B expands when heated. 
• Metal A contracts more than metal B. 
• Metal A expands more than metal B. 
• Metal B expands more than metal A. 

The liquid in the thermometer rises when it is placed in the hot water because ___________. 

• it gains heat from the hot water and expands.
• loses heat from the hot water and contracts. 
• the surrounding air is too warm. 
• the liquid is boiling. 

A bimetallic strip is made up of _____________________ welded together.

• two metals of the same kind 
• two different metals that expand and contract unequally
• two different metals that expand and contract equally

If the atoms of an object are moving or vibrating fast, the temperature would be...

• Hot
• Cold
• Unknown

If the atoms of an object are moving or vibrating slow, the object would feel...

• Cold
• Hot
• Unknown

Many objects, such as train tracks and road joints, are specifically designed to allow extra space for ...

• thermal energy
• specific heat
• thermal expansion
• conductors