Force

Students design an experiment to determine how much force is needed to move blocks of wood of different masses across a lab table. Which procedure should students include in their design?

• Conduct five trials, using a different scale to pull each block of wood

• Conduct five trials, pulling a different side of each block each time

• Conduct five trials, using a different table for each trial

• Conduct five trials, pulling each block of wood in the same way for each trial

Tags

NGSS.MS-PS2-2

A student uses a spring scale to pull a 50-gram block horizontally across a wood desk. Then the student pulls the block the same distance across surfaces of carpet, sandpaper, and glass. Which question is this investigation most likely designed to answer?

• How do blocks of different sizes react to force?

• How do different surfaces affect the amount of force needed to move a block?

• How do blocks affect spring scales?

• How does the mass of a block change when it is pulled across a desk?

Tags

NGSS.MS-PS2-2

A student designs an experiment to test the effect of the width of a piece of elastic on the elastic's ability to stretch. The student selects four pieces of elastic with different widths but the same length. The student then attaches blocks with different masses to the pieces of elastic. The results of the student's experiment are shown below. Why can't we find an answer to this investigation?

• There are 2 variables - elastic width and mass.

• The elastic is too narrow.

• The masses are too heavy.

• You can find an answer using this investigation.

Tags

NGSS.MS-ETS1-1

A student designs an experiment to test the effect of the width of a piece of elastic on the elastic's ability to stretch. The student selects four pieces of elastic with different widths but the same length. The student then attaches blocks with different masses to the pieces of elastic. The results of the student's experiment are shown below. What should the student do to improve this experiment?

• Use blocks of equal mass on the four pieces of elastic

• Use blocks with enough mass to cause the four pieces of elastic to break

• Use more than four pieces of elastic and four blocks

• Use four pieces of elastic with different lengths but the same width

Tags

NGSS.MS-PS2-2

Which word describes a push or pull on an object?

• hypothesis

• force

• mass

• position

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Which experiment listed below will best determine how friction affects the speed of a rolling object?

• Roll 3 objects of various sizes across the floor

• Roll 3 objects of equal size from various heights across the floor

• Roll 3 objects of equal size across 3 different types of surfaces

• Roll 3 objects of equal size from equal heights across the floor

What is the unit of measurement of force?

• Grams

• Milliliters

• Newtons

• Meters

What force is being tested when an object is forced downward toward the center of the Earth?

• gravity

• air pressure

• magnetism

• friction

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

What is an example of a gravitational force?

• Pushing a grocery cart

• dropping a pencil on the ground

• pulling a wagon

• picking up iron filings with a magnet

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

A marble is rolled in a straight line inside a box. When the marble gets to the end of the box, it changes direction and rolls the other way. Which statement best describes why this happens?

• The marble had nowhere else to go, so it moved in the opposite direction

• The force of gravity on the box pushed the marble in the opposite direction

• The force of the marble hitting the box produced an opposite force pushing the marble in the opposite direction

• The marble stopped by the wall and then magnetic force pushed it in the opposite direction

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2