Four solid balls, each with a different mass, are moving at the same speed. Which ball would require the most force to stop its motion? 

• ball with a mass of 5 kg 
• ball with a mass of 10 kg 
• ball with a mass of 15 kg 
• ball with a mass of 20 kg 

A girl walked for 30 minutes. She noticed that she traveled farther in the first 15 minutes of her walk than in the second 15 minutes. What can she conclude about her walk? 

• She walked over many hills. 
• Her average speed was faster during the first half of her walk. 
• She walked in two different directions. 
• She was walking at a constant speed

In which way are evaporation and condensation similar? 

• Both cause decreases in air temperature. 
• Both cause increases in air temperature. 
• Both are caused by the warming of the atmosphere.
• Both are caused by changes in heat energy. 

Which is an example of a different substance being formed? 

• glass breaking
• metal melting 
• water freezing
• wood burning 

Which is most responsible for the uneven heating of the air in the atmosphere?

• convection

• radiation

• conduction

• condensation

A pot is heated on a stove. Which process causes the metal handle of the pot to also become hot? 

• combustion 
• convection 
• radiation 
• conduction 

Which best describes why winds at the beach change direction between day and night?

• because the temperatures over land and over water change 
• because warm air over land sinks and stays in place over land 
• because cool air rises and is replaced by warm air from the ocean 
• because cool air sinks and stays in place over land 

Which will most likely result from a low-pressure weather system? 

• warm temperatures 
• cloudy conditions 
• clear conditions 
• cool temperatures 

Which is the best explanation for how air masses move across the United States? 

• The prevailing westerlies move air masses from west to east across the United States but may be deflected by the jet stream.
• The trade winds move air masses from west to east across the United States. 
• The jet stream moves air masses from the Pacific Ocean across the United States. 
• The warm air of the Gulf Stream causes air masses to move from the Atlantic Ocean to the Pacific Ocean. 

Which has the greatest effect on wind speed? 

• precipitation 
• cloud cover 
• wind direction
• air pressure