Middle School Physical Science Flashcards: Questions About Electric Forces

What this deck covers

This deck focuses on Questions About Electric Forces, giving you a quick way to review the definitions, rules, and examples that matter most for Middle School Physical Science.

How to use these flashcards

Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Flashcard 1: What is the dependent variable in a test of magnetic force strength using paper clips?

Answer: Number of paper clips lifted (force indicator). Measures force indirectly by counting objects the magnet can lift.

Flashcard 2: What is the independent variable in a test of magnetic force vs. distance from a magnet?

Answer: Distance from the magnet. The variable you change to test its effect on magnetic force.

Flashcard 3: What is the relationship between electric force and charge magnitude in Coulomb’s law?

Answer: Electric force increases as charge magnitude increases. Force is directly proportional to each charge's magnitude.

Flashcard 4: Identify the controlled variables when testing how $q_1$ affects electric force between two objects.

Answer: Keep $q_2$ and $r$ constant. Isolates $q_1$'s effect by keeping other factors unchanged.

Flashcard 5: Which factor determines whether the electric force between two charges is attractive or repulsive?

Answer: The signs of the charges. Opposite signs attract; same signs repel.

Flashcard 6: Which factor must be kept constant when testing how distance affects electric force strength?

Answer: Charge amounts (and their signs). Must stay the same to isolate distance's effect on force.

Flashcard 7: What is the independent variable in an investigable question about electric force vs. distance?

Answer: Distance between the charges. The variable you change to test its effect on force.

Flashcard 8: Which variable most directly changes an electromagnet’s strength in a simple circuit?

Answer: Electric current through the coil. Current creates the magnetic field in an electromagnet.

Flashcard 9: What is the dependent variable in an investigable question about electric force vs. distance?

Answer: Measured electric force strength. The variable you measure to see the effect of distance.

Flashcard 10: Which factor must be kept constant when testing how the number of coil turns affects electromagnet strength?

Answer: Current and core material. Isolates coil turns' effect by keeping other factors unchanged.

Flashcard 11: What happens to magnetic force between two magnets when the distance between them increases?

Answer: It decreases. Magnetic fields weaken with distance from the source.

Flashcard 12: What is the SI unit of force used for electric and magnetic forces?

Answer: Newton (N). Named after Isaac Newton; measures all types of forces.

Flashcard 13: What happens to an electromagnet’s strength when an iron core is added to the coil?

Answer: It increases. Iron concentrates and amplifies the magnetic field.

Flashcard 14: What happens to an electromagnet’s strength when the number of coil turns increases?

Answer: It increases. More turns concentrate the magnetic field lines.

Flashcard 15: What happens to an electromagnet’s strength when the current in the coil increases?

Answer: It increases. More current means stronger magnetic field around the wire.

Flashcard 16: What factor about a magnet most directly affects how strong its magnetic force can be?

Answer: Magnet strength (magnetization) and size/material. Stronger magnets have more aligned magnetic domains.

Flashcard 17: Which interaction occurs when a north pole faces a south pole of another magnet?

Answer: Attraction. Opposite magnetic poles attract each other.

Flashcard 18: Which interaction occurs between two opposite electric charges (for example, $+$ and $-$)?

Answer: Attraction. Opposite charges attract; fundamental law of electrostatics.

Flashcard 19: Which interaction occurs between two like electric charges (for example, $+$ and $+$)?

Answer: Repulsion. Like charges repel; this is a fundamental law of electrostatics.

Flashcard 20: What is the SI unit of electric charge used when discussing electric force strength?

Answer: Coulomb (C). Named after Charles-Augustin de Coulomb who studied electric forces.

Flashcard 21: What is the dependent variable in a test about factors that change force strength?

Answer: The measured force strength (for example, deflection, distance, or pull). This is what you measure to see the effect of your changes.

Flashcard 22: Which variables should be kept the same when testing one factor that affects force strength?

Answer: All control variables (everything except the independent variable). Ensures any changes in results are due to the tested variable only.

Flashcard 23: Which variable should you change in a fair test of electric or magnetic force strength?

Answer: Only one independent variable. Changing multiple variables makes it impossible to determine cause.

Flashcard 24: What is an investigable question in science (one that can be tested by collecting data)?

Answer: A question testable by measurement or observation with controlled variables. Must have measurable outcomes and variables you can control.

Flashcard 25: What happens to electric force if the magnitude of one charge increases (distance unchanged)?

Answer: It increases. Larger charges create stronger electric fields and forces.

Flashcard 26: What happens to electric force when the distance between two charges increases?

Answer: It decreases. Force weakens with distance squared (inverse square law).

Flashcard 27: What is an investigable question that tests how a material between charges affects electric force?

Answer: How does the insulating material type between charges affect $F$. Tests if different materials between charges change the force.

Flashcard 28: What formula relates electric force, charge amounts, and distance for point charges?

Answer: $F = k\frac{|q_1q_2|}{r^2}$. Coulomb's law shows force depends on charges and inverse square of distance.

Flashcard 29: Which factor should be held constant when testing the effect of current on electromagnet strength?

Answer: Number of coil turns and core material (keep constant). Keep other factors constant to isolate current's effect.

Flashcard 30: What investigable question tests how iron core presence affects an electromagnet's strength?

Answer: How does adding an iron core affect magnetic force at a fixed current. Tests if iron core enhances magnetic field strength.