science review 2

Ice melting

• Chemical Change
• Physical Change

Baking soda and vinegar combine to make carbon dioxide

• Chemical Change
• Physical Change

Boiling water

• Chemical Change
• Physical Change

The tendency of an object to stay in motion or at rest until a force acts upon it is

• inertia

• gravity

• speed

• frame of reference

A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is most responsible for causing the wagon to stop?

• gravity acting on the wagon
• the mass of the wagon
• friction acting on the wagon
• the mass of the child

A pencil falls off of a desk. What moves the pencil toward the floor? 

• mass
• friction
• gravity
• speed

Michelle drove 300 miles in 6 hours. What was Michelle’s speed?
(speed = distance ÷ time)

• 30 miles per hour
• 50 miles per hour
• 60 miles per hour
• 80 miles per hour

This graph shows the motion of an object. Which best describes the motion of the object?

• It is sitting still.

• It is moving at a constant speed.

• It continually increases its speed.

• It travels at constant speed and suddenly stops.

Joe rolls a ball to Cindy, and Cindy rolls it back to Joe at the same speed.

Which graph shows the motion of the ball as it rolls between them?

• 
• 
• 
• 

Which best describes the role friction plays in the operation of a car?

• Friction makes a car go faster.

• Friction keeps a car from stopping.

• Friction turns the car in a new direction.

• Friction helps a car slow down and stop.