NC Science Review Units

Kendra is riding her skateboard on her driveway. She starts at her door and finishes at the end of the driveway.

Then Kendra gets back on her skateboard and begins to move again. The distance/time graph below shows Kendra's motion in relation to her door.

• Kendra is riding down a hill.

• Kendra's speed is decreasing.

• Kendra is moving at a constant speed toward her door.

• Kendra's speed is increasing.

Who ran at the greatest speed?

• Frank

• Brett

• Clay

• Patricia

Paco throws a ball. What force pulls the ball down toward

the ground?

• friction

• gravity

• inertia

• momentum

A soccer ball is rolling across the grass. It begins to slow down. Then it stops. What force caused the motion to stop?

• pull

• push

• friction

• gravity

Which of the following shows decreasing speed?

• 
• 
• 
• 

Look at the diagram of the water cycle. Which step of the water cycle is missing from the diagram?

• evaporation

• condensation

• precipitation

• radiation

The picture shows how one material is recycled in ecosystems. This material is _______.

• water

• food

• nitrogen

• carbon

Which step of the water cycle is described below?

The water in the air cools off and becomes small droplets of water which stick together to make clouds.

• photosynthesis

• condensation

• evaporation

• precipitation

Which step of the water cycle is described below?

Energy from the Sun heats up water on Earth's surface, and the water goes into the air as water vapor.

• precipitation

• condensation

• evaporation

• reflection

A teacher adds 2 g of chalk to 25 g of vinegar in a tightly sealed jar. The chalk and vinegar react, and gas bubbles form. What is the total mass of the jar’s contents after the reaction takes place?

• 23 g

• 25 g

• 27 g

• 50 g