Question

9 fill in the blanks to complete the sentences. not all the words will be used. rubbing a balloon on someone’s hair and then pulling it away increases blank potential energy. the balloon and hair become oppositely blank, causing them to blank one another. the higher the balloon is held, the more blank potential energy it has. increasing the balloon’s blank would also increase its blank energy. (word options: electric, charged, attract, gravitational, mass, stored, repel, speed)

Answer:

First blank:

When rubbing a balloon on hair, it's about electric potential energy (due to static electricity). So the word is "electric".

Second blank:

After rubbing, the balloon and hair get opposite charges, so "charged".

Third blank:

Oppositely charged objects attract, so "attract".

Fourth blank:

Height affects gravitational potential energy, so "gravitational".

Fifth and Sixth blanks:

Increasing mass (fifth) increases gravitational potential energy, or increasing speed (but speed is for kinetic; wait, no—wait, the last part: "increasing the balloon’s [mass] would also increase its [stored? No, wait, kinetic energy is (1/2)mv², but if it's potential, no. Wait, maybe: "Increasing the balloon’s mass would also increase its gravitational potential energy" (since \( PE_g = mgh \)), or "speed" for kinetic, but the last energy—maybe "mass" and then "stored" (no, better: the last two blanks: first, "mass" (since \( PE_g = mgh \), mass affects it), then "stored" (no, or "kinetic" but the word is "stored"? Wait, no, the words given: "mass" and then maybe "stored" is not. Wait, the words are: electric, charged, attract, gravitational, mass, stored, repel, speed.

So:

1. Rubbing a balloon on someone’s hair and then pulling it away increases electric potential energy. (Static electricity, electric potential energy)

1. The balloon and hair become oppositely charged, causing them to attract one another. (Opposite charges attract)

1. The higher the balloon is held, the more gravitational potential energy it has. (Gravitational PE depends on height)

1. Increasing the balloon’s mass would also increase its stored (no, wait, \( PE_g = mgh \), so mass increases gravitational PE, which is a type of stored energy. Or "speed" for kinetic, but the word "stored"—wait, the words: "mass" and then "stored" (but "stored" is an adjective? No, maybe "mass" and then "kinetic" but kinetic energy is \( \frac{1}{2}mv^2 \), so increasing speed or mass. But the words given: "mass" and "speed" and "stored". Wait, the last sentence: "Increasing the balloon’s [mass] would also increase its [stored] energy"—no, better: "Increasing the balloon’s mass would increase its gravitational potential energy (stored energy), or increasing speed would increase kinetic energy. But the words available: "mass" and "stored" (no, "stored" is not a type of energy, but "kinetic" is not an option. Wait, the words are: electric, charged, attract, gravitational, mass, stored, repel, speed.

So:

• First blank: electric (electric potential energy from static charge)

• Second blank: charged (oppositely charged)

• Third blank: attract (opposite charges attract)

• Fourth blank: gravitational (gravitational potential energy depends on height)

• Fifth blank: mass (since \( PE_g = mgh \), mass increases PE)

• Sixth blank: stored (gravitational PE is stored energy)

Or, if the last part is kinetic: "speed" and then "stored" no—wait, the words: "speed" and "stored"—no, "stored" is not kinetic. Wait, the problem says "Not all the words will be used". So:

1. electric

1. charged

1. attract

1. gravitational

1. mass

1. stored (or maybe "speed" and "kinetic" but kinetic isn't an option. So with the given words, it's:

• First: electric

• Second: charged

• Third: attract

• Fourth: gravitational

• Fifth: mass

• Sixth: stored (since gravitational PE is stored)

So the filled sentences:

• Rubbing a balloon on someone’s hair and then pulling it away increases electric potential energy.

• The balloon and hair become oppositely charged, causing them to attract one another.

• The higher the balloon is held, the more gravitational potential energy it has.

• Increasing the balloon’s mass would also increase its stored energy. (Or if it's kinetic, "speed" and then "stored" no—wait, "stored" is not kinetic. So with the given words, "mass" and "stored" make sense as gravitational PE is stored, and mass increases it.)

So the blanks are filled as:

1. electric

1. charged

1. attract

1. gravitational

1. mass

1. stored