Category 1: Energy Forms
A skateboarder waits at the TOP of a ramp. Which type of energy is stored because of position?
A. Sound energy
B. Potential energy
C. Light energy
D. Electrical energy
Answer: B — Potential energy is stored because of position.
A rubber band makes a sound when plucked because it _____.
A. Melts
B. Vibrates
C. Reflects
D. Glows
Answer: B — Vibrations produce sound.
Two objects have the SAME electric charge.
What will they tend to do?
A. Repel each other B. Attract each other C. Melt D. Lose gravity
Answer: A — Like charges repel.
A battery-operated clock and a small solar-powered calculator both work.
What is TRUE about their energy sources?
A. Both begin with sound energy.
B. Their starting energy sources are different.
C. Both must be connected to wall outlets.
D. Neither device uses electrical energy.
Answer: B — The clock uses stored chemical energy in its battery, while the calculator uses light energy collected by a solar cell.
What must a simple working circuit have for electrical current to flow continuously?
A. A complete conducting loop B. A colorful plastic case C. A long wire only D. Two switches
Answer: A — A complete, closed conducting pathway is required.
A blender spins its blades. Which energy form is shown by the moving blades?
A. Mechanical energy
B. Chemical energy
C. Light energy
D. Sound energy
Answer: A — The moving blades have mechanical energy.
Which sound will have a HIGHER pitch?
A. A string vibrating 20 times each second
B. A string vibrating 80 times each second
C. A string that is not vibrating
D. Both strings have the same pitch
Answer: B — Faster vibrations produce a higher pitch
A charged comb pulls tiny pieces of neutral tissue toward it without touching them.
What does this demonstrate?
A. Magnetic friction B. A noncontact electrical force C. Gravity disappearing D. Sound energy
Answer: B — Charged objects can attract uncharged objects without contact.
An electric hand mixer turns its beaters.
Which output energy is MOST obvious?
A. Chemical energy B. Mechanical energy (motion) C. Gravitational energy D. Solar energy
Answer: B — Electrical energy makes the beaters move.
A toy spaceship has batteries, and its switch is ON. However, its propeller will not spin.
Which observation would BEST prove that electrical current is reaching the motor?
A. The switch says ON. B. The wires look shiny. C. The propeller spins. D. The battery is new.
Answer: C — A spinning propeller provides observable evidence that the motor
A marble rolls down a track. Which statement is correct?
A. It has no energy.
B. Its motion gives it kinetic energy.
C. It only has chemical energy.
D. Motion destroys energy.
Answer: B — Moving objects have kinetic energy.
A student looks at a straw in a clear cup of water. The straw appears bent.
What happens to the light?
A. It is absorbed
B. It is reflected.
C. It is refracted.
D. It becomes sound.
Answer: C — Refraction is the bending of light as it passes between materials.
Two charged party balloons move TOWARD one another.
Which is the BEST explanation?
A. They have opposite charges. B. They have the same charge. C. They are both heavy. D. The air is hot.
Answer: A — Opposite charges attract.
A doorbell rings when its button is pressed.
What useful output energy is produced?
A. Sound energy
B. Gravitational energy
C. Chemical energy
D. Potential energy
Answer: A — Electrical energy changes into sound energy.
A string of lights stops working after one wire comes loose and leaves a gap.
What is the MOST likely cause?
A. The circuit is open. B. The wire became heavier. C. Light energy turned into mass. D. The lights became magnets.
Answer: A — The gap interrupts the conducting pathway.
Four identical shopping carts travel at the SAME speed. They carry 1, 3, 5, and 7 identical books.
Which cart has the MOST kinetic energy?
A. The cart with 1 book
B. The cart with 3 books
C. The cart with 5 books
D. The cart with 7 books
Answer: D — At the same speed, the cart with the greatest mass has the most kinetic energy.
A laser beam hits a mirror and changes direction back into the room.
Which behavior explains this?
A. Reflection
B. Absorption
C. Friction
D. Vibration
Answer: A — Reflection occurs when light bounces off a surface.
After rubbing two identical plastic rulers with the same cloth, a student notices that the rulers push away from one another.
Which conclusion BEST explains the observation?
A. Their charges are alike. B. They must be magnets. C. Gravity reversed direction. D. They have no electrical charge.
Answer: A — Repulsion is evidence of like charges.
A battery-operated clock and a small solar-powered calculator both work.
What is TRUE about their energy sources?
A. Both begin with sound energy.
B. Their starting energy sources are different.
C. Both must be connected to wall outlets.
D. Neither device uses electrical energy.
Answer: B — The clock uses stored chemical energy in its battery, while the calculator uses light energy collected by a solar cell.
A student replaces a broken wire with a metal paper clip, but the bulb stays dark.
What should the student check NEXT?
A. Only the color of the paper clip
B. Whether the other connections and bulb work
C. The height of the desk
D. The temperature of the classroom
Answer: B — Another loose connection or broken component could prevent the bulb from lighting.
A student says, "The heaviest ball ALWAYS has the most kinetic energy."
Which response BEST evaluates the claim?
A. True, even if the ball is stopped.
B. False, because speed also matters.
C. True, because mass and speed are the same thing.
D. False, because mass never matters.
Answer: B — Kinetic energy depends on both mass and speed.
Two students disagree about this statement:
"A louder drum always has a higher pitch."
Which observation would BEST test the claim?
A. Compare the colors of the drums.
B. Compare their vibration rates, not just loudness.
C. Compare the prices of the drums.
D. Count how many people hear each drum.
Answer: B — Pitch depends on vibration rate, while loudness is a different property.
A positively charged object is held near a neutral metal can. The can rolls toward the charged object.
A student says:
"The can MUST have an overall negative charge because it moved toward the positive object."
Which response BEST evaluates the student's claim?
A. Correct, because attracted objects always have opposite overall charges.
B. Incorrect, because a charged object can attract a neutral object.
C. Correct, because all metal objects are magnets.
D. Incorrect, because electricity only works when objects touch.
Answer: B — Attraction does not prove that the can has an
A toy uses batteries to power a motor that spins its wheels.
Which TWO-step energy transformation BEST explains how the toy works?
A. Chemical → Electrical → Motion
B. Motion → Chemical → Light
C. Sound → Gravity → Heat
D. Light → Sound → Chemical
Answer: A — The battery stores chemical energy, which becomes electrical energy that powers motion.
A robot's motor will not turn. The batteries work, and the motor works when connected to another complete circuit.
Which new finding BEST explains the problem?
A. The robot is painted red.
B. One wire is detached from the switch.
C. The motor is round.
D. The robot is lightweight.
Answer: B — The detached wire creates an open circuit, preventing current