Demonstration of Learning - Grade 7 Science

A teacher asks her class to brainstorm investigations that would help them better

understand the different ways thermal energy is transferred. The class created a list of

investigations they wanted to perform.

Read each investigation description. Which examples show that energy is transferred by conduction?

• 1 and 2

• 2 and 3

• 2 and 4

• 3 and 4

Tags

NGSS.MS-PS3-4

NGSS.MS-PS1-4

What do the arrows in the model above represent and why?

• A. Convection currents. The particles in the liquid move freely, so when the liquid is heated, it rises, cools, and begins to sink again. This results in thermal energy transfer.

• B. Convection currents. The particles in the liquid touch other particles and cause thermal energy to be transferred without particle movement.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-3

When analyzing how thermal energy moves through radiation, which of the following is NOT correct?

• A. Radiation requires a medium (like air or water) to transfer heat.

• B. Objects emit thermal radiation based on their temperature.

• C. All surfaces can absorb and emit thermal radiation, but some are better than others.

• D. Thermal radiation travels in all directions from its source.

Tags

NGSS.MS-PS4-2

In a heated building, the temperature of the walls is measured and found to be significantly warmer than the outside air temperature. Which of the following models best explains how thermal energy is conducted into and radiated from the walls of the building?

• A. A model focusing solely on the conduction of heat from the heating system to the walls, neglecting radiation.

• B. A model illustrating both conduction from the heating system to the walls and radiation from the warm walls to the cooler outside environment.

• C. A model that only considers radiation from the heating system, ignoring conduction.

• D. A model showing that heat retention is only due to insulation, with no conduction or radiation.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS1-4

Read the scenario and look at the model below to answer question #5.

The image below is a lava lamp. There is a light bulb in the base of the lava lamp and

the

visible part has wax blobs floating in a liquid. The wax blobs change shape and move up and

down inside the lamp when the light bulb is on. When the lamp is off, the wax settles to the

bottom of the lamp.

How does heat transfer contribute to the movement of the blobs in a lava lamp, and what role does temperature play in this process?

Tags

NGSS.MS-PS3-4

NGSS.MS-PS1-4

NGSS.MS-PS3-5