unit 7 Science - Chapter 3.5-7 Energy

Heat is the movement of ______.

• radiation

• thermal energy

• cold

• fire

Answer explanation

Heat is the movement of thermal energy, which refers to the transfer of energy between particles due to temperature differences. The other options do not accurately describe this process.

Heat from the sun travels to Earth by _____.

• conduction

• convection

• insulation

• radiation

Answer explanation

Heat from the sun travels to Earth by radiation, which is the transfer of energy through electromagnetic waves. Unlike conduction and convection, radiation does not require a medium to travel.

On a hot summer day, which shirt would you put on to make sure you stay cool while you are outside playing?

• A black shirt because it reflects the sun's energy.

• A white shirt because it reflects the sun's energy.

• A black shirt because it absorbs the sun's energy.

• A white shirt because it absorbs the sun's energy.

Answer explanation

A white shirt reflects the sun's energy, helping to keep you cool on a hot summer day. In contrast, a black shirt absorbs heat, making it less suitable for staying cool while playing outside.

Energy of motion is which type of energy?

• Potential

• Kinetic

• Sound

• Gravitational

Answer explanation

Energy of motion is known as kinetic energy. It refers to the energy that an object possesses due to its movement, distinguishing it from potential energy, which is stored energy based on an object's position.

What type of energy is in this picture?

• Kinetic

• Potential

• Chemical

• Sound

Answer explanation

The picture likely depicts an object at rest or elevated, indicating stored energy. This is known as potential energy, which is energy due to position or condition, unlike kinetic energy which is associated with motion.

When plants convert the sun's energy into food, which type of energy is it?

• kinetic

• chemical

• thermal

• radiant

Answer explanation

When plants convert sunlight into food through photosynthesis, they transform radiant energy from the sun into chemical energy stored in glucose. Thus, the correct answer is chemical.

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. Thermal energy is associated with the temperature of an object and the motion of its particles, making it the correct choice.

What kind of energy does this device use?

• Chemical

• Electrical

• Thermal

• Chemical

Answer explanation

The device uses electrical energy, which is the correct choice. Electrical energy powers the device, while chemical and thermal energies are not applicable in this context.

What kind of energy is represented in the picture?

• Thermal

• Chemical

• Sound

• Nuclear

Answer explanation

The picture represents chemical energy, which is stored in the bonds of chemical compounds. This energy is released during chemical reactions, distinguishing it from thermal, sound, or nuclear energy.

A battery converts what type of energy to another?

• sound to kinetic

• light to heat

• mechanical to electrical

• chemical to electrical

Answer explanation

A battery converts chemical energy stored in its materials into electrical energy when it discharges. This process is essential for powering devices, making 'chemical to electrical' the correct choice.