ENERGY AND FORCES UNIT TEST CONNECTIONS ACADEMY
Please help!!!

1. A model shows a machine that works using electrical fields. What would this machine need for the electrical field to function properly? (1 point)

springs, to store potential energy

at least two charged, interacting parts

moving parts, for kinetic energy

all neutral components

2. Where do the forces that make atoms interact come from?(1 point)

from the electric fields of neutral molecules

from the electric fields of charged subatomic particles

from the electric fields of neutral subatomic particles

from the electric fields of charged molecules

3.Which diagram would represent kinetic energy and launched particles?(1 point)

an arrow drawn on a bow, with the bow string pulled back

an arrow released from the bow

an arrow released and stuck in a target

an arrow being strung on a bow, with the bowstring straight

4. During chemical reactions, bonds between atoms break and form. What does this mean in terms of subatomic particles?(1 point)

Electrical fields of charged particles interact, bonding those with the same charge.

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

Electrical fields of neutral particles interact, bonding those with the same charge.

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

5.What is the driving force behind chemical reactions between elements?(1 point)

the attraction of electrons of different atoms

the attraction of protons of different atoms

the interaction of the electric fields of neutrons and electrons

the interaction of the electric fields of protons and electrons

6. 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?(1 point)

The energy stored in the system does not change.

The energy stored in the system decreases.

The energy stored in the system first increases and then decreases.

The energy stored in the system increases.

7. 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?(1 point)

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

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

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

Kinetic energy decreases because the magnets move in the opposite direction of the field.

8. 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? (1 point)

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

Iron pieces accelerate away from the magnet, and the energy stored in the system increases.

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

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

9. 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?(1 point)

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

The energy stored in the field increases because there is no friction.

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

The energy stored in the field decreases because there is no friction.

10. 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? (1 point)

The energy stored increases and then decreases.

The energy stored decreases and then increases.

The energy stored increases.

The energy stored decreases.