Middle School NGSS Resource Hub
Three-dimensional breakdowns, phenomenon ideas, misconceptions, and engagement activities for every NGSS middle school standard.
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→Physical ScienceMS-PS1 to MS-PS4 • 19 standards
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Middle School NGSS Standards
Pick any standard. Each page is your full lesson-planning workspace for that standard.
Fields Between Objects: Investigating Forces That Act Without Touching
"Conduct an investigation and evaluate the experimental design to provide evidence that fields exist between objects exerting forces on each other even though the objects are not in contact."
"Examples of this phenomenon could include the interactions of magnets, electrically-charged strips of tape, and electrically-charged pith balls. Examples of investigations could include first-hand experiences or simulations."
"Assessment is limited to electric and magnetic fields, and limited to qualitative evidence for the existence of fields."
The three dimensions packed into this standard
Every standard bundles a DCI (the content), a SEP (the science practice), and a CCC (the crosscutting lens). They run in the same task, not in sequence.
"Forces that act at a distance (electric, magnetic, and gravitational) can be explained by fields that extend through space and can be mapped by their effect on a test object (a charged object, or a ball, respectively)."
Some forces work without contact. A magnet pulls a paperclip across a gap. A charged balloon tugs a stream of water without touching it. Earth pulls a dropped pencil to the floor. The explanation isn't magic. It's a field. A field is a region around an object where another object can feel a force. The space isn't empty.
"Conduct an investigation and evaluate the experimental design to produce data to serve as the basis for evidence that can meet the goals of the investigation."
Students aren't just watching a demo. They're running an investigation and then turning around and critiquing how it was set up. Did the procedure actually produce evidence a field exists? Were the variables controlled? Would a skeptical classmate buy the data? Running the experiment is half the work. Evaluating the design is the other half.
"Cause and effect relationships may be used to predict phenomena in natural or designed systems."
Fields cause forces. That's the whole cause-and-effect chain. A magnetic field is the cause. A paperclip jumping toward the magnet is the effect. Students use that pattern to predict what will happen when the field is stronger, when distance increases, or when something blocks the path. If they can predict, they understand the cause.
📍 Where This Standard Fits in the K-12 Progression
Use this to plan the year. Knowing what students should already know and what they're heading toward keeps the lesson focused.
Objects can push or pull each other without touching. Magnets can attract or repel from a small distance, and that effect depends on what the objects are made of and how they're oriented.
Fields Between Objects: Investigating Forces That Act Without Touching
Fields get treated mathematically. Students model electric, magnetic, and gravitational fields with equations, connect them to energy stored in the field itself, and explain how a changing field in one place causes a force somewhere else.
🌎 Phenomena for MS-PS2-5
Anchor the lesson in one puzzling phenomenon kids keep coming back to. Use the two investigative phenomena to sharpen specific facets.
The Paperclip That Jumps
Hold a strong neodymium magnet near a paperclip resting on a table. Lower the magnet slowly. At some distance the paperclip suddenly hops off the table and snaps to the magnet. Nothing touched it before it moved. Students will keep circling back to this all week. What reached across that gap and pulled the paperclip up?
"What's happening in the space between the magnet and the paperclip that makes the paperclip move?"
- "Does the paperclip feel the magnet the whole time, or only when it jumps?"
- "If I put cardboard between them, will it still jump?"
- "How far away can the magnet be and still make the paperclip move?"
Iron Filings Reveal the Pattern
Sprinkle iron filings on a piece of paper laid flat over a bar magnet. Tap the paper. The filings shift and line up in arcs flowing from one end of the magnet to the other. The pattern was there the whole time, just invisible. Use this one to sharpen the lens the anchor is pushing on: the space between objects isn't empty, it's filled with a field.
"Why do the iron filings form a pattern, and what is that pattern showing us about the space around the magnet?"
- "Is the pattern there before we add the filings, or do the filings create it?"
- "Would the pattern look different with a stronger or weaker magnet?"
- "What would the pattern look like with two magnets near each other?"
The Balloon and the Water Stream
Turn on a thin stream of water from a faucet. Rub a balloon on a sweater or hair, then hold it close to the stream without touching. The water bends toward the balloon. The stream is moving, the balloon is still, and something is reaching across the air to pull the water sideways. Use this one to sharpen the same lens, only with electric force instead of magnetic.
"How can a balloon pull on water it isn't touching?"
- "Is the same kind of pull at work here as with the magnet?"
- "What's different between rubbing the balloon and not rubbing it?"
- "Would the balloon bend a stream of oil or soda the same way?"
⚠️ Misconceptions Your Students Will Walk In With
These come up almost every year. Knowing them in advance lets you head them off in the first lesson.
"Magnets have to touch something to pull it"
Magnets exert force through air, paper, plastic, glass, and even thin sheets of non-magnetic metal. A paperclip will jump toward a strong magnet across a visible gap. The space between them isn't empty. It's filled by the magnetic field, which is what does the pulling.
"When static cling pulls two things together, they were already touching"
Watch a charged balloon and a small piece of torn paper. They start separated. The balloon's electric field reaches across the gap, exerts a force on the paper, and pulls it through the air. The field acted first, the contact came second. That's the entire point of a non-contact force.
"The space between a magnet and a paperclip is empty"
It looks empty, but it isn't. A magnetic field fills the region around any magnet. You can't see the field directly, but iron filings sprinkled in that space will line up along the field, making the invisible pattern visible. Empty to the eye doesn't mean empty in physics.
"A field and a force are the same thing"
A field is a region of space where a force can act on certain objects. The force is what the field does to those objects. Field is the cause, force is the effect. A magnet has a magnetic field around it always. The field only produces a force when something it can pull or push (like iron) is in that field.
🙋 Common Student Questions and How to Respond
These come up almost every time this standard gets taught. Plan a response and you'll keep the lesson focused.
Same way we know wind is real. You don't see wind, you see what it does. With a magnetic field, sprinkle iron filings on paper over a bar magnet and the pattern shows up. With an electric field, a charged balloon pulls scraps of paper across a gap. The field is the explanation for what you observed. The evidence is the effect.
Rubbing transferred charge from your hair to the balloon. The charged balloon now has an electric field around it. When you bring it near the wall, the field pulls on charges in the wall, and the wall pulls back. The pull is strong enough to hold the balloon against gravity. Take the charge away, the field weakens, the balloon falls.
Through most non-magnetic materials, pretty much yes. Paper, plastic, wood, glass, water, your hand. The field reaches through and the force still works on the other side. Some materials, like iron and steel, redirect or absorb the field. That's why magnetic shielding uses iron, not aluminum.
Yes. Earth has a gravitational field that fills the space around it. When you drop a pencil, the field pulls it down. We focus on electric and magnetic fields in this standard because they're easier to investigate in a classroom, but gravity works the same way. Non-contact force, explained by a field.
📚 Vocabulary Students Need for MS-PS2-5
Twelve terms students need to access this standard. Definitions in plain-English, classroom-ready language.
A region of space around an object where another object can feel a force. The field exists whether anything is there to feel it or not.
A force one object exerts on another without touching it. Magnetic, electric, and gravitational forces all act at a distance.
The region around a magnet (or a moving charge) where magnetic force acts. Can be visualized using iron filings.
The region around a charged object where electric force acts. A charged balloon has an electric field around it.
The region around any object with mass where gravitational force pulls other objects toward it. Earth's gravitational field is what holds you down.
Another way to say non-contact force. The objects affect each other across a gap, with no direct touch.
A planned procedure for gathering evidence about a question. Includes setup, observation, and recording.
The choices you make about how to run an investigation. What you'll measure, what you'll control, what counts as evidence.
A factor in an investigation that can change. Controlled variables are kept the same; the independent variable is what you change on purpose.
An observation or measurement that supports (or doesn't) a claim. Iron filings forming a pattern is evidence a magnetic field exists.
A statement that can be tested. "A field exists between these two objects" is a claim. The investigation produces evidence to support it.
Looking at an investigation and asking what could have been done better. A critique points to specific weaknesses, not just whether the result was right or wrong.
💡 Free Engagement Ideas for MS-PS2-5
Iron Filings Field Mapping
Pairs lay paper over a bar magnet and sprinkle iron filings on top. They tap the paper to let the filings settle along the field. Each pair sketches the pattern, then repeats with the magnet flipped, then with two magnets placed end to end (north-to-south, then north-to-north). They write what changed and why.
Charged Tape Investigation
Each pair pulls two strips of clear tape off a desk surface and observes how they push apart in midair. Then they rip a third strip and bring it near to see the attract/repel pattern. They predict, test, and record. The investigation is short, the data is qualitative, and the critique afterward is where the real thinking happens.
Magnet Through Materials
Students test whether a magnet's force reaches a paperclip through different materials: paper, cardboard, plastic wrap, aluminum foil, a piece of steel. They predict first, then test, then organize findings into a table. The steel result is the surprise: it blocks the field while aluminum doesn't.
PhET Charges and Fields Sim
Use the free PhET Charges and Fields simulation. Students place positive and negative charges in the simulation, turn on the field visualization, and observe the field pattern. They run three trials: one charge, two opposite charges, two same charges. They sketch each field and write a prediction about what a charged object placed in the field would do.
📝 Assessment Ideas for MS-PS2-5
Three short tasks that hit all three dimensions. Doable in one class period each.
Students design a simple investigation to provide evidence that an electric or magnetic field exists between two objects. They write the procedure, identify variables, and predict the result. Then they trade procedures with a classmate, who runs a critique: what's controlled, what isn't, what additional evidence would strengthen the conclusion.
Students are shown a photo of iron filings arranged in arcs around a bar magnet and a video clip of a charged balloon attracting bits of paper. For each, they write a short claim about what the evidence shows, identify the field involved, and explain the cause-and-effect chain from field to force.
Students are given a setup (a magnet, a paperclip, and three barrier materials of their choice) and asked to predict which barriers will block the magnetic field and which won't. They explain their reasoning before testing. After testing, they write a short paragraph evaluating the experimental design: did the test actually answer the question, and what could be improved?
🎯 What Proficient Student Work Looks Like
Same prompt, three student responses at different proficiency levels. Use as anchor papers when scoring.
"Use evidence from an investigation to explain how you know a magnetic field exists between a magnet and a paperclip, even though the two objects are not touching."
- A specific claim backed by data, observation, or model
- Use of standard-specific vocabulary in context
- Connection between the visible and the underlying explanation
- A question they're still wondering about (curiosity stays alive)
I know a magnetic field exists because the paperclip moved toward the magnet. The magnet was pulling it. So there must be a field there.
Names a force and a result. Doesn't connect the field to the space between the objects. Doesn't cite specific evidence from an investigation. Stops at "there must be a field."
In our investigation, we put a paperclip on the table and lowered a magnet toward it without touching. At about 3 cm away, the paperclip jumped up to the magnet. We also put a piece of cardboard between them and the paperclip still moved when the magnet got close. This is evidence a magnetic field exists in the space between the magnet and the paperclip. The field is the cause, and the paperclip moving is the effect. The field reached across the gap and even through the cardboard.
Cites specific evidence from a hands-on investigation. Names the field as filling the space between the objects. Connects field (cause) to force (effect). Hits exactly what the standard is targeting.
Our investigation tested whether a magnetic field could reach across an empty gap and through different materials. We held a magnet above a paperclip on the table. At about 4 cm, the paperclip jumped up to the magnet. We repeated with paper, cardboard, and aluminum foil between them, and the paperclip still moved each time. With a steel cookie tin lid as a barrier, the paperclip stayed still. This is evidence a magnetic field exists in the space around the magnet. The field is the cause; the force on the paperclip is the effect. One weakness in our design: we didn't measure the distance precisely, so 'about 4 cm' is rough. A better version would use a ruler taped to the table and three repeated trials per material. The steel result is the most interesting because it shows the field doesn't pass through everything. Steel redirects the field, which is why it blocks the paperclip from feeling the pull.
Specific procedure and specific evidence. Cites multiple materials including a counter-example (steel). Articulates cause and effect cleanly. Critiques the experimental design with a concrete improvement. Raises a deeper question about why steel behaves differently. This is exactly the kind of investigate-and-evaluate reasoning the standard targets.