Forms of Energy

The rock in the picture is pushed over the edge and it begins to fall. Which type of energy conversion is taking place?

• mechanical to heat

• sound to mechanical

• potential to kinetic

• kinetic to potential

Answer explanation

As the rock falls, it converts gravitational potential energy (due to its height) into kinetic energy (due to its motion). Thus, the correct energy conversion taking place is potential to kinetic.

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-2

A ball is projected into the air. Where is potential energy the greatest?

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Tags

NGSS.MS-PS3-2

Which point on the roller coaster's path represents the maximum potential energy?

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Tags

NGSS.MS-PS3-2

As a roller coaster goes downhill

• kinetic energy is converted into potential energy.

• potential energy is converted into kinetic energy.

• electrical energy is converted into potential energy.

• potential energy is converted into electrical energy.

Answer explanation

As a roller coaster goes downhill, it loses height, converting potential energy (due to its height) into kinetic energy (motion). Thus, the correct choice is that potential energy is converted into kinetic energy.

Tags

NGSS.HS-PS3-3

NGSS.HS-PS3-2

When gasoline is burned in a car engine, ________ energy is converted into _________ energy.

• heat, chemical

• chemical, potential

• mechanical, chemical

• chemical, mechanical

Answer explanation

When gasoline burns, its stored chemical energy is released and converted into mechanical energy, which powers the car. Thus, the correct answer is 'chemical, mechanical'.

Tags

NGSS.HS-PS3-3

Within the alarm clock seen here, energy is transformed. It is time to get up! The alarm clock goes off. What are the energy transformations taking place in your alarm clock?

• electrical to magnetic to sound

• electrical to mechanical to sound

• electrical to mechanical to light

• chemical to electrical to mechanical

Answer explanation

The alarm clock transforms electrical energy into mechanical energy to move the internal components, which then produce sound energy to alert you. Thus, the correct transformation is electrical to mechanical to sound.

Tags

NGSS.MS-PS3-5

Muscles convert chemical energy into

• light energy.

• nuclear energy.

• mechanical energy.

• electromagnetic energy.

Answer explanation

Muscles convert chemical energy from food into mechanical energy, which is used for movement and physical activity. This makes 'mechanical energy' the correct answer.

Tags

NGSS.MS-PS3-5

What form of energy does a compressed spring have?

• heat energy

• kinetic energy

• chemical energy

• elastic potential energy

• gravitational potential energy

Answer explanation

A compressed spring stores energy due to its position. This energy is called potential energy, as it has the potential to do work when released. The other options, like kinetic and chemical energy, do not apply in this context.

Tags

NGSS.MS-PS3-2

Maria’s father started a fire in the fireplace. He crumpled some paper, lit a match, and soon the logs in the fireplace were burning. In this case, the stored chemical energy in the logs was changed into

• electrical energy.

• mechanical motion.

• heat and light energy.

• electrical and heat energy.

Answer explanation

The stored chemical energy in the logs is transformed into heat and light energy when they burn, making 'heat and light energy' the correct choice.

Tags

NGSS.MS-PS3-5

Marina is using a metal spoon to stir her soup. Why does the spoon feel warm?

• Stirring creates heat energy in the spoon.

• Marina’s hand warms the spoon she is holding.

• Heat energy from the soup is transferred to the spoon.

• Heat energy from the spoon is transferred to the soup.

Answer explanation

The spoon feels warm because heat energy from the soup is transferred to the spoon. This transfer occurs due to conduction, where the warmer soup heats the metal spoon, making it feel warm to the touch.

Tags

NGSS.MS-PS3-5