Energy and Forces Unit Test

Using a simple model of an electromagnet, describe the factors that increase the magnetic field strength of an electromagnet.

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In 3-4 sentences, describe how a particle accelerator works and give an example of the applications of the discoveries made with them.

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A magnet is removed from a refrigerator door and placed on a table. In 1-2 sentences, explain how the potential energy of the system changes in this process.

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In 3-5 sentences, explain how gravity causes Earth's tides.

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Which diagram would represent kinetic energy and launched particles?

an arrow released from the bow

A model shows a machine that works using electrical fields. What would this machine need for the electrical field to function properly?

at least two charged, interacting parts

In models of magnetic and electric fields, why are field vectors depicted by arrows?

because they represent both their magnitude and direction

What is the weak nuclear force?

a force that governs how elements break down naturally

More coils are produced when the wire is wrapped tightly around the iron core. What will happen to the property of the electromagnet with an increasing number of coils?

The electromagnet will become more powerful.

During chemical reactions, bonds between atoms break and form. What does this mean in terms of subatomic particles?

Electrical fields of charged particles interact, bonding those with opposite charges.

The north pole of a bar magnet is moved close to the north pole of another bar magnet that is suspended by a thread. How does the energy stored in the magnetic field change?

The energy stored in the field decreases because the magnet moves in the direction of the field.

A giant magnet moves above a debris pile with many pieces of iron buried in it. Which statement is correct about the energy stored in the magnetic field?

Iron pieces accelerate toward the magnet, and the energy stored in the system decreases.

On which planet is gravity strongest?

Jupiter

A student places two horseshoe magnets next to each other, and the poles of the magnets attach to each other. How does the kinetic energy of the system change?

Kinetic energy increases because the magnets move in the direction of the field.

The north and south poles of two magnets are attached to each other. A student pulls the poles apart and hold them at a distance of 10 cm. How does the energy stored in the system change?

The energy stored in the system increases.

Two magnets with like poles facing each other are brought close to each other and then released. How does the energy stored in the system change?

The energy stored increases and then decreases.

Which observation or inference is correct? (Battery attached to a nail over some pins)

The wire was not connected to the source.

A community seeks to develop a maglev train operation. Which of the following is most likely their technical motivation for choosing this option?

They seek a rail line not affected by friction.

A model depicts two balloons of the same size with identical negative charges being moved toward one another at the same speed. How will the balloons interact with each other?

They will repel, moving in opposite directions at the same speed.

What is the driving force behind chemical reactions between elements?

the interaction of the electric fields of protons and electrons