PS2 Lessons 5 - 6 _ Thermal Energy & Energy Transfer

What is a system?

• A. A collection of unrelated parts

• B. A set of parts that connect and interact in a way that achieves something

• C. A single part that functions independently

• D. A random assembly of objects

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Which of the following is true about the individual parts of a system?

• A. They are always useful on their own

• B. They can be systems themselves

• C. They are always larger than the system

• D. They do not interact with other parts

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NGSS.MS-LS1-2

What is kinetic energy associated with?

• Only the motion of large objects like planes

• Only the motion of small objects like atoms and molecules

• The motion of any object regardless of its size

• none of these are true

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NGSS.MS-PS3-1

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Which of the following can be considered a system?

• An atom

• A molecule

• A click pen

• All of the above

Answer explanation

Even an atom can be considered a system because it consists of parts - subatomic particles called protons, neutrons, and electrons.

Molecules consist of many atoms.

A basketball is a system because it has a skin, valve to fill it with air, and the air itself.

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NGSS.MS-LS2-3

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What happened when we stacked the racquetball on top of the basketball?

• A. The basketball bounced lower

• B. The racquetball bounced higher

• C. nothing changed

• D. The basketball bounced lower & the racquetball bounced higher

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NGSS.MS-PS2-1

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Why did the Basketball bounce so much higher than the Racquetball?

• The BB has a greater volume.

• KE of the basketball was transferred to the racquetball.

• The RB has a greater mass.

• The mass of the balls is not a factor.

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NGSS.MS-PS3-4

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Which energy diagram below explains why the racquetball (RB) bounced higher when stacked on top of the basketball (BB)?

• GPE (BB) → GPE (RB)

• KE (BB) → GPE (RB)

• GPE (BB) → KE (RB)

• KE (BB) → KE (RB)

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NGSS.MS-PS3-4

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What factor resulted in the basketball more KE than the racquetball?

• the elastic potential energy

• The size of the basketballs

• The mass of the basketball

• the size of the racquetball

Answer explanation

Mass is a factor that influences the amount of GPE & KE of an object.

Therefore, the greater mass of the basketball gave it greater KE that was transferred to the racquetball.

This transfer caused the basketball to bounce lower with the racquetball stacked on top of it than it did on its own.

Tags

NGSS.MS-PS3-1

Why does a ball stop bouncing?

• Due to gravity alone

• Energy is only transformed, not transferred

• Energy is neither transformed nor transferred

• Energy is transformed and transferred to its surroundings

Answer explanation

KE of the basketball was transferred directly to the surrounding air causing the air to move and the ball to slow down.

Some energy was transformed into Thermal energy (which warmed the ball before transferring to the surrounding air).

Some kinetic energy was transferred to the ground and to the air and created sound energy.

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NGSS.MS-PS3-5

What type of energy is sound classified as?

• kinetic energy

• potential energy

• elastic energy

• Thermal Energy

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