Semester Final Review

Every object in the universe experiences some sort of force. It could be gravity holding Earth in orbit around the sun, or it could be someone sliding a chair across the floor. What best describes a force?

• a push or pull

• a binding energy

• an attraction

• a type of mass

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Energy is the capacity to do work. There are many types of energy that exist in nature. Which of the following describes an object with potential energy?

• a person typing at a keyboard

• a stove heating up a pot

• a light switch being turned on

• a roller coaster at the top of a hill

Tags

NGSS.MS-PS3-2

Energy can be stored, transferred, or converted, but it cannot be created or destroyed. Which law describes the rule that energy follows?

• interference of energy

• transference of energy

• conservation of energy

• conversion of energy

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Angelina is learning how to build circuits. She starts by connecting a light bulb to a battery with copper wires. In her studies, she reads that the current flows due to a difference in potential energy in the system. Which statement describes what is happening to cause current to flow?

• Voltage is when current flows from lower to higher potential energy.

• Voltage is when current flows from higher to lower potential energy.

• Amperes is when current flows from lower to higher potential energy.

• Amperes is when current flows from higher to lower potential energy.

Tags

NGSS.MS-PS3-2

Mr. Bissell creates a diagram of electric and magnetic fields to teach his students about the concepts. He includes the similarities and differences between the fields on the diagram. Which of the following statements should he add about the similarities between the two fields?

• The field lines in both magnetic and electric fields are always straight.

• Each charged particle and magnet have both a positive and negative side.

• Opposite charges and poles are always attracted to each other.

• The potential energy increases as like charges or poles get farther apart.

Shandra is studying Earth’s magnetic field in her science class. She learns that a giant shield around her planet protects all living things from dangerous charged particles from the sun. How does the magnetic field protect life on Earth?

• The magnetic field directs charged particles toward the poles and then past Earth.

• The magnetic field directs charged particles toward the equator and then past Earth.

• The magnetic field absorbs the charged particles coming from the sun.

• The magnetic field directs charged particles toward the poles then absorbs them.

Credit cards contain a strip on the back made up of many tiny bar magnets. When the bar magnets are arranged in a certain order, they can create a code from the resulting magnetic field. The code contains information like the account number and expiration date of the card. What can happen when the credit card accidentally comes into contact with a strong magnet?

• The magnetic field on the card is created by permanent magnets that cannot be changed by another magnet.

• The magnetic field on the card can be amplified so that the card can be read from farther away.

• The magnetic field on the card can be altered so that it will contain a different account number.

• The magnetic field on the card can be disrupted, causing it to be demagnetized or unreadable.

Vincent is listing the ways that he could increase the magnetic field of the solenoid he made. Which of the following can he add to his list?

• increasing the number of loops

• spacing the loops farther apart

• decreasing the current

• adding an insulating core

Tags

NGSS.MS-PS2-3

Micah is experimenting with altering the strength of electromagnets. He is changing the current running through the wires and the number of coils on the electromagnet. What would the magnetic strength be for an electromagnet with 75 coils and a current of 2?

• 7,500

• 75,000

• 15,000

• 150,000

Tags

NGSS.MS-PS2-3

Larry uses a transformer to step down an incoming voltage. The transformer has ten loops in the primary coil and six in the secondary. If the incoming voltage is 120 volts, what is the outgoing voltage?

• 720

• 72

• 200

• 20