7 P 11

Which best explains why the cyclist (#3) cannot be used as a good reference point?

• It is heading in the wrong direction.

• It is moving too slow.

• It is moving too fast.

• A good reference point should not move.

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

• A

• B

• C

• D

7.E.1.6 Why would the Environmental Protection Agency seek to monitor atmospheric pollution and air quality?

• to make sure the air pressure remains constant over time

• to make it rain in drought affected areas

• to maintain the respiratory health of humans

• to reduce the amount of oxygen released by the rainforests

Explain how the motion of an object can be described by its position, direction of motion, and speed with respect to some other object.

What best describes motion?

• change of speed over time

• change in position over time

• change of acceleration over time

• change in velocity over time

Tags

NGSS.MS-PS3-1

Students are observing a frog. The frog will not hop or move forward. Two students start a debate. Marcus states that the frog is moving because it can hop. Maria states the frog is not moving because it is not changing position. Who is correct and why?

• Marcus- everyone knows a frog can hop.

• Marcus- everyone knows hopping is movement.

• Maria- an object has to change position to “move”.

• Neither- position has nothing to do with movement AND the frog is able to hop.

Tags

NGSS.3-PS2-2

Why do scientists use a reference point?

• To determine if an object is in motion

• To find information in the library

• To know where they are

• To measure speed