Unit 3 Field Forces and Energy

A moon orbits a planet at a distance of 6.5 × 10⁵ km with a radius of 2,000 km. What is the relative difference in the gravitational forces exerted on the moon’s surface versus its center?

• 0.00308

• 0.285

• 285

• 308

Tags

NGSS.HS-PS2-4

A negatively charged rod is brought near one end of a metal bar. What is the charge distribution in the metal bar?

• Negative charges gather at both ends of the metal bar.

• Positive charges gather at both ends of the metal bar.

• Positive charges gather at the end closest to the rod, and negative charges gather at the end farthest from the rod.

• Negative charges gather at the end closest to the rod, and positive charges gather at the end farthest from the rod.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

• 0.437 AU³/y²

• 2.90 AU²/y²

• 5.65 AU³/y³

• 42.1 AU²/y³

Tags

NGSS.HS-ESS1-4

A system consists of three charges: A, B, and C. The electric field between them indicates that charge A is repelled by both B and C. What are the charges of points B and C, respectively?

• Negative, Negative

• Positive, Positive

• Positive, Negative

• Negative, Positive

Tags

NGSS.HS-PS2-4

An object with a charge of −300 nC is placed near an object with a charge of +200 nC. What type of electrostatic force exists between them, and what affects its magnitude?

• Repulsive; force depends only on the charge of the negative object

• Attractive; force depends only on the charge of the positive object

• Repulsive; force depends on both charges

• Attractive; force depends on both charges

Tags

NGSS.HS-PS2-4

A spacecraft has a mass of 2,000 kg and orbits Earth at a distance of 8,000 km from Earth's center. A satellite with a mass of 3,000 kg orbits Earth at 40,000 km from Earth's center. How does the gravitational force compare?

• The gravitational force on the spacecraft is greater than that on the satellite.

• The gravitational force on the satellite is greater than that on the spacecraft.

• The gravitational forces on both are equal.

Tags

NGSS.HS-PS2-4

A charged particle is moving within an electric field toward the source of the field. Assuming no other external forces act on it, how does its energy change?

• The charge of the particle increases.

• The potential energy of the particle decreases.

• The electric force on the particle decreases.

• The mass of the particle changes.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A charged object with –9.0 μC charge is placed 15 cm away from a second object with a charge of +7.0 μC. Using Coulomb’s law, what is the magnitude of the electric force between them?

• 2.8 N

• 4.2 N

• 28 N

• 42 N

Tags

NGSS.HS-PS2-4

The shape of a planet’s orbit is best described as a:

• Circle

• Ellipse

• Parabola

• Hyperbola

Tags

NGSS.HS-ESS1-4

As a planet moves farther from the Sun, it moves:

• Faster

• Slower

• At a constant rate

Tags

NGSS.HS-ESS1-4