7 P 11

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

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

Which of the following objects would make a good reference point?

• A flying bird

• A bus that is driving down the street

• A car at a stoplight

• A tree

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.

Kendra measured the time it took her to run 30 meters. What can she calculate using the distance and time measurements?

• Mass

• Force

• Speed

• Direction

Tags

NGSS.MS-PS3-1

If a car moves at a speed of 60 miles per hour for 2 hours, how far will it go?

• 12 miles

• 120 miles

• 2 hours

• 120 mph

the process of changing position

• motion
• reference point
• acceleration
• speed

Tags

NGSS.MS-PS2-2

When an object's position is changing, that means it is in ________.

• motion
• speed
• direction
• position

John stands at the top of a steep cliff and pushes a ball over the edge with his foot. Which force causes the ball to fall off the cliff.

• Mass

• Gravity

• Friction

• Air resistance

Tags

NGSS.MS-PS2-4

A train is moving along a track. If the forces acting on the train are balanced, how will its motion be affected?

• Change direction

• Continue, unchanged

• Speed up

• Stop

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2