Exploring Energy and Charges Quiz

Sophia rides her bike to and from school. Sophia’s bike has a special tape that reflects energy from the sun to make it easier for cars to see her. She also uses a bell to let other bikers know if she is going to move past them. Which of the following forms of energy does Sophia not use when biking?

• Mechanical energy

• Sound energy

• Light energy

• Electrical energy

Omar shines his flashlight directly at a mirror. Which statement best tells what happens to the light from the flashlight when it hits the mirror?

• It will disappear.

• It will continue in a straight line.

• It will reflect back at the source.

• It will end.

Lili is investigating sound energy by plucking stretched rubber bands. She recorded her data in the table. Which conclusion is NOT supported by the data?

Rubber Band                    Length of Rubber Band (cm)                           Observation of Sound

1                                                                   3                                                                            highest pitch

2                                                                   9                                                                             high pitch

3                                                                  16                                                                        medium pitch

4                                                                   20                                                                            low pitch

5                                                                   25                                                                             lowest pitch

• The rubber bands vibrate when plucked.

• Each of the rubber bands vibrates at the same speed.

• The length of the rubber band is related to the pitch produced.

• Shorter rubber bands vibrate faster than longer rubber bands.

A group of students took a field trip to an old mill. They learned that old-fashioned gristmills depend on water to grind grain into flour. Water is a source of energy for a gristmill. Which statement correctly describes why this is so?

• Moving water produces wind that turns the gristmill, so it grinds the grain.

• Warm water heats the gristmill, causing it to move and grind the grain.

• Water produces electricity to turn the gristmill, so it grinds the grain.

• Moving water turns the gristmill, causing it to move and grind the grain.

Jose is making this chart of examples of actions in which energy has caused change, as shown below. He accidentally added one that should NOT have been listed. Which action should Jose have left off his chart?

Dropping a book, Holding a cup, Rolling a ball, Opening a door

• Dropping a book

• Holding a cup

• Rolling a ball

• Opening a door

Sidney is experimenting with two charged objects. She holds the objects close to each other, but she makes sure they never touch. Which is the only hypothesis about the two objects that Sidney would find to be true?

• If the first object has a positive charge and if the second object has a negative charge, then the objects push away from each other.

• If both objects have a negative charge, then the objects pull toward each other.

• If the first object has a negative charge and if the second object has a positive charge, then the objects push away from each other.

• If both objects have a positive charge, then the objects push away from each other.

Which sentence best describes how electrically charged objects interact?

• An object with a negative charge will repel objects with a positive charge.

• An object with a positive charge will be attracted to objects with a positive charge.

• An object with a negative charge will be attracted to objects with a positive charge.

• An object with a positive charge will repel objects with a negative charge.

Which statement correctly compares electric charge with electric current?

• They both require a human to make them.

• Neither require charged particles.

• They both require a battery and a bulb.

• They both require a movement of charged particles.

Jennifer gets tired of waiting for her brothers to finish playing golf. She presses on the pedal of the golf cart and it starts to move. Which of the following explains how the golf cart is able to move?

• Chemical energy stored in the battery is transformed to electrical energy which moves the cart.

• Mechanical energy from Kimberly's foot is transformed to electricity that moves the cart.

• Light energy absorbed from the Sun is transformed to electrical energy that moves the cart.

• Sound energy created by the cart is transformed to heat energy that moves the cart forward.