The universe’s total amount of energy does not ever change, but the amount of this energy that is available to do work varies tremendously. What statement best explains the changes in available energy?(1 point)

Question

Responses

Energy constantly changes from one form to another.
Energy constantly changes from one form to another.

The only way to create energy is through nuclear reactions.
The only way to create energy is through nuclear reactions.

Energy transfer always occurs through heat.
Energy transfer always occurs through heat.

100% of energy is always converted with perfect efficiency.

Answer 1

The statement that best explains the changes in available energy is:

Energy constantly changes from one form to another.

This reflects the concept of energy conservation and transformation, indicating that while the total amount of energy remains constant, its availability to do work can change based on the form it takes.

Answer 2

When a match is struck, what forms of energy does the burning match give off?(1 point)
Responses

Solar energy and nuclear energy
Solar energy and nuclear energy

Thermal energy and solar energy
Thermal energy and solar energy

Light energy and thermal energy
Light energy and thermal energy

Nuclear energy and light energy
Nuclear energy and light energy

Answer 3

The correct response is:

Light energy and thermal energy.

When a match is struck and burns, it produces heat (thermal energy) and emits light (light energy).

Answer 4

A light is connected to a battery as shown below.

What type of energy transfer occurs?

(1 point)
Responses

Chemical energy to mechanical energy
Chemical energy to mechanical energy

Mechanical energy to electrical energy
Mechanical energy to electrical energy

Chemical energy to electrical energy
Chemical energy to electrical energy

Electrical energy to mechanical energy

Answer 5

The correct response is:

Chemical energy to electrical energy.

In this scenario, the battery converts chemical energy stored in it into electrical energy that powers the light.

Answer 6

When an electric fan is plugged into a wall outlet, the fan blades spin as a result. What energy transformation occurred?(1 point)
Responses

Electrical to mechanical
Electrical to mechanical

Mechanical energy is created, but electrical energy is destroyed.
Mechanical energy is created, but electrical energy is destroyed.

Electrical energy is created, but mechanical energy is destroyed.
Electrical energy is created, but mechanical energy is destroyed.

Mechanical to electrical

Answer 7

The correct response is:

Electrical to mechanical.

When the electric fan is plugged in, it transforms electrical energy from the outlet into mechanical energy, which causes the fan blades to spin.

Answer 8

A simple circuit is wired with a battery, a switch, and a bell.

When the switch is turned on, what energy transformations will occur?

(1 point)
Responses

The switch transforms electrical energy to chemical energy, which the bell then transforms to sound energy.
The switch transforms electrical energy to chemical energy, which the bell then transforms to sound energy.

The switch’s electrical energy transforms to sound energy, which the wire transfers to the bell.
The switch’s electrical energy transforms to sound energy, which the wire transfers to the bell.

The battery’s chemical energy transforms to electrical energy, which the bell then transforms to sound energy.
The battery’s chemical energy transforms to electrical energy, which the bell then transforms to sound energy.

The battery’s chemical energy transforms to sound energy, which the wire transfers to the bell.

Answer 9

The correct response is:

The battery’s chemical energy transforms to electrical energy, which the bell then transforms to sound energy.

In this circuit, the battery converts its stored chemical energy into electrical energy when the switch is turned on, and then the bell uses that electrical energy to produce sound energy.

Answer 10

A woman runs as shown.

What main energy conversion occurs?

(1 point)
Responses

Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner.
Mechanical energy changes into thermal energy because the energy from motion creates heat in the air around the runner.

Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.
Mechanical energy changes into chemical energy as the kinetic energy from motion creates reactions in the surrounding air.

Thermal energy changes into mechanical energy because heat provides energy for motion.
Thermal energy changes into mechanical energy because heat provides energy for motion.

Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion.

Answer 11

The correct response is:

Chemical energy changes into mechanical energy because energy from digestion of food provides energy for the runner’s motion.

When the woman runs, the chemical energy stored in her body (from the food she has digested) is converted into mechanical energy, allowing her to move.