Energy

A television works by transforming electrical energy into what other kinds of energy?

• Light, thermal, and sound

• Thermal, chemical, and solar

• Sound, mechanical, and electrical

• Light, chemical, and mechanical

Answer explanation

A television converts electrical energy into light (for the image), thermal energy (as heat), and sound (for audio output). Thus, the correct answer is light, thermal, and sound.

Tags

NGSS.MS-PS4-1

The roller coaster cart has the most gravitational potential energy at position-

• W

• X

• Y

• Z

Answer explanation

The roller coaster cart has the most gravitational potential energy at position W, as it is at the highest point in the track. At this position, the potential energy is maximized due to the elevation above the ground.

Tags

NGSS.MS-PS2-4

What kind of energy is represented in this picture?

• Thermal

• Potential

• Nuclear

• Mechanical

Answer explanation

The picture likely depicts heat or warmth, which is indicative of thermal energy. This type of energy is associated with the temperature of an object and the motion of its particles, distinguishing it from potential, nuclear, or mechanical energy.

Tags

NGSS.MS-PS1-4

What kind of energy is represented in the picture?

• Thermal

• Chemical

• Sound

• Nuclear

Answer explanation

The picture likely depicts a reaction or process involving substances, indicating the release or absorption of energy through chemical bonds. Therefore, the energy represented is chemical energy.

Tags

NGSS.MS-LS1-7

What kind of energy is being shown in the picture?

• Light

• Gravitational

• Potential

• Kinetic

Answer explanation

The picture likely depicts an object at a height, indicating stored energy due to its position. This is known as potential energy, which is energy held by an object because of its position relative to other objects.

Tags

NGSS.MS-PS3-1

The rock has kinetic energy.

• True

• False

Answer explanation

The statement is false because a rock must be in motion to have kinetic energy. If the rock is stationary, it does not possess kinetic energy.

Tags

NGSS.MS-PS3-1

Which is the best example of kinetic energy?

• A car sitting on top of a hill

• A skateboard on the sidewalk

• A wagon rolling down a hill

• A powerwheel parked in the yard

Answer explanation

Kinetic energy is the energy of motion. A wagon rolling down a hill is in motion, demonstrating kinetic energy, while the other options are stationary or not in motion.

Tags

NGSS.MS-PS3-1

How does heat move?

• In many directions

• from warm places to cooler places

• from cold places to warm places

• Both B and C

Answer explanation

Heat moves from warm places to cooler places due to the second law of thermodynamics, which states that energy naturally flows towards equilibrium. Therefore, the correct answer is 'from warm places to cooler places'.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

If you burn your hand on the handle of a hot pot, heat was transferred to your skin by

• conduction

• convection

• radiation

• equilibrium

Answer explanation

When you touch the hot handle, heat transfers directly from the handle to your skin through conduction, which is the process of heat transfer through direct contact between materials.

What type of heat transfer is occurring in the picture below? (the pan is touching the burner)

• conduction

• convection

• radiation

• insulation

Answer explanation

The heat transfer occurring in the picture is conduction, as the pan is directly touching the burner. This allows heat to transfer through direct contact between the two surfaces.

Tags

NGSS.MS-PS3-4