Science

A bat flies three kilometers. A scientist wants to find the bat's speed. Which other information does the scientist need?

• the bat's starting position
• the bat's mass while flying
• the direction the bat flies
• the amount of time the bat flies

Four shoppers are pushing identical shopping carts through a store at the same speed. Each cart contains a different object. Which cart will require the least force to stop its motion?

• the cart containing an object with a mass of 700 g. 
• the cart containing an object with a mass of 530 g.
• the cart containing an object with a mass of 390 g.
• the cart containing an object with a mass of 180 g.

Which is an example of heat being transferred by radiation?

• an ice cube melting in a hot bowl of soup.
• sunlight warming a puddle of water.
• a mug of hot coffee warming a person's hands.
• hot water moving from the bottom of a kettle to the top.

When does heat stop flowing between two objects?

• when the objects reach the same temperature.
• when one object gains enough heat to melt.
• when one object loses enough heat to freeze.
• when object loses all of its heat.

A student observes and records  changes in some materials. Which is an example of a new substance forming?

• a puddle of water evaporates.
• an iron nail rusts.
• an ice cream bar melts.
• a drinking glass breaks.

Spoons made of steel, wood, copper, and plastic are placed in a pot of hot water. Which spoon or spoons will most likely heat up easily?

• steel spoon
• steel and copper spoons
• steel, wood, and copper spoons
• steel, wood, and plastic spoons.

During January and February, which most likely helps keep weather mild along the coast of North Carolina?

• El Nino
• La Nina
• the Gulf Stream
• the jet stream

If a wind vane points south, which is the best conclusion?

• The wind is blowing toward the south.
• A storm is coming from the north.
• the wind is blowing from the south.
• The wind is increasing in speed.

A girl is conducting an investigation in which she will predict weather? Which tool will she most likely need?

• spring scale
• barometer
• pan balance
• meterstick

An organism gets the nutrients if needs by breaking down dead leaves. Which is the best way to classify the organism?

• as a producer.
• as a decomposer
• as an herbivore
• as a consumer