Everything for the Forces, Energy and Waves test: study cards, the traps to dodge, a practice quiz at three levels — Foundation, On-Level, and Challenge — and a lab where you label, graph, sort and argue. Work here, or print it and use a pencil — both count.
Two equal pushes, opposite ways. Whatever the box was doing, it keeps doing — even if that is moving.
Speeding up, slowing down, and turning are all changes in motion, and every one of them needs an unbalanced force. Balanced does not mean stopped — it means nothing is changing.
Four things people get wrong
⚠️People often think…
Balanced forces mean the object is sitting still.
Balanced means nothing is changing. A car at a steady 30 in a straight line has balanced forces and is not stopped at all.
Balanced = no change. Not the same as no motion.
⚠️People often think…
If the speed stays the same, there is no acceleration.
Turning at a steady speed is accelerating, because the direction changed. That is why you feel pushed sideways on a curve.
Speed, or direction — either one counts.
⚠️People often think…
Energy gets used up.
Energy never disappears — it moves or changes form, and the form it usually ends up in is heat. Brake pads get hot for exactly this reason.
Can't find the energy? Look for something warm.
⚠️People often think…
A higher wave is a higher pitch.
Taller waves are louder, or brighter. It is frequency — how many waves go by — that sets pitch, or color. Amplitude and frequency are two separate dials.
Taller = louder. More often = higher.
Find the force, follow the energy
1Watch one
A car drives at a steady 30 mph down a straight road. Balanced or unbalanced forces?
Is the speed changing? No.
Is the direction changing? No.
Nothing about the motion is changing.
Balanced — even though the car is moving fast.
2Do one with me
A ball rolls across a carpet and slowly comes to a stop.
The motion changed, so the forces were
The force that slowed it was
Its energy did not vanish — it turned into
💬One sentence, then you move on
Why does a car at a steady speed have balanced forces even though it is moving?
3Try one
A car goes around a curve without speeding up or slowing down. Is it accelerating? Write yes or no.
I want a hint first
Acceleration means any change in motion — including a change of direction.
💬Last one — then you're done here
Where does the energy go when something slows down?
Where this goes
Where this lives
Seat belts, brake pads that get hot enough to smell, the volume knob on a speaker, and why you slide toward the door on a sharp turn.
What this feeds
Next unit is Earth's systems, where these same forces and this same energy move rock, water and air.
Name one thing that got warm today because something else slowed down.
One card at a time — tap “Show me” to check yourself, then Next. Start at Foundation; when those feel easy, climb.
Helpful Hints
🪜 From a push to a wave — the ladder
Force → net force → motion changes (or doesn’t) → energy moves between kinetic, potential and thermal → waves carry energy without carrying stuff.
Push, add, move, store, wave.
🤝 The whole topic in one idea
Nothing changes its motion for free. If something speeds up, slows down or turns, an unbalanced force did it — and the energy that made the change didn’t vanish, it moved somewhere.
Find the force. Follow the energy.
⚠️ Traps the test loves
Balanced forces don’t mean ‘stopped’ — steady speed in a straight line is balanced too.
Turning at a steady speed IS accelerating — direction changed.
In a collision the two forces are EQUAL (third law). The lighter object flies because of the second law, not a bigger force.
Energy is never ‘used up’. Look for heat.
Amplitude is loudness/brightness. Frequency is pitch/color. Don’t swap them.
Sound needs a medium; light doesn’t.
📐 Newton’s three laws — the chart
Law
Says
Everyday proof
1 — inertia
motion stays the same until an unbalanced force acts
you lurch forward when the bus brakes
2 — F = m·a
more force, more acceleration; more mass, less
an empty cart is easier to get rolling
3 — pairs
every push has an equal push back
a rocket rises by pushing gas down
Keep · change · pair.
🎯 How the test will ask
Two arrows on a box — “what happens?” (add them; zero → same motion, not zero → it accelerates that way).
A distance table with growing gaps — “speeding up or steady?” (growing gaps = speeding up).
A coaster diagram — “where is kinetic energy greatest?” (the lowest point).
Two waves drawn — “which is louder / higher?” (taller = louder; more crests in the same space = higher).
✅ Before the test, can you…
Add two forces and say what the object does?
State all three of Newton’s laws with one example each?
Trace a coaster’s energy from top to stop, heat included?
Label crest, trough, wavelength and amplitude on a drawn wave?
Explain why you can see but not hear an explosion in space?
Pick your level
Look back at anything you missed — the hint that appeared is exactly what to reread tonight.
How sure did you feel?
Lab
Work like a scientist: label the diagrams, turn the table into a graph, then write a claim with evidence and reasoning. Every lab checks itself on the spot, and hints are free.
Your practice never leaves this device. There is no account and no sign-in. Your work is saved in this browser only, and you can erase it whenever you want.
Your practice record — saved on this device
This is your record of the module on screen — it stays here and goes nowhere. Independent means you got it right on the first tap; supported means you got it after the explain-and-retry, or marked ‘I had it’ on a revealed answer. Both count, and neither is a grade. If your teacher asks, copy the row or show them this screen.
Date
—
Topic
—
Level
—
Independent
0 of 0
Supported
0 of 0
Hints used
0
Cards studied
0
Lab
—
Traps met
0
Explained in own words
0
Confidence
—
The answer key is for a teacher: it prints only from here, for the unit on screen. Print the study packet prints the study pages and a blank quiz — never the answers.