Which will slow an object in motion?

• speed

• friction

• gravity

• momentum

The position vs. time graph below can be used to describe Jim's motion as he rides his motorcycle. Which of the following is true?

• Jim and his motorcycle are slowing down.

• Jim is riding his motorcycle at a speed of five meters per second.

• Jim is riding the motorcycle in a straight line.

• Jim and his motorcycle are standing still.

Which graph represents an object that is moving at constant speed?

• Z

• Y

• W

• X

Which will require the most force to move?

• a 1­kg ball

• a 10­kg ball

• a 100­kg ball

• a 1,000­kg ball

The graph displays the motion of two cars. Which statement best describes the motion of the cars displayed in the graph?

• Car X traveled on a straighter road than Car Y.

• Car X traveled at a constant speed, while Car Y's speed increased.

• Car X traveled at a constant speed, while Car Y's speed decreased.

• Car Y traveled at a constant speed, while Car X's speed decreased.

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

• precipitation

• condensation

• evaporation

The picture shows a model of the water cycle. In the picture, a bowl that contains water is placed under a heat lamp. Ice cubes are placed on a sheet of plastic that covers the bowl. In the picture, different parts of the water cycle are numbered. Which of these does number 2 represent?

• condensation

• collection

• precipitation

• evaporation

What happens in the process of the water cycle?

• Water transforms into other types of liquid.

• Water changes from one state to another.

• Water keeps the same physical properties.

• Water becomes a gas in between each step.

A student is comparing the mass of a model airplane to its parts. She places the completed model airplane on one side of the balance.

Which picture best shows the direction of the pointer when the parts are added to the other side of the balance?

• 
• 
• 
• 

Which change is most likely to produce a new substance?

• a piece of paper burning

• sugar dissolving into water

• glass breaking into many pieces

• water boiling and creating steam