Thermal Energy L1-6

Flimsy cup walls

Flimsy straw

One wall layer

Snap on lid with gaps

Wider straw opening

Features of Regular Cup

Thicker cup walls

Thicker straw

Double layer wall

Tight lid with seal

Features of Fancy Cup

The Impact of Walls and Lids

​How can we best keep a drink cool?

A lid seems to be an important feature for keeping a drink cool. Cups without lids warmed up more than cups with lids.

.

More walls seem to be an important feature for keeping a drink cool. Cups with only one wall heated up more than cups with two or three walls.

Multiple Select

How do walls and lids help keep a drink at the same temperature? (Click two answer options)

• A lid keeps a drink at the same temperature because it prevents most of the heat and water from escaping.

• A lid keeps a drink at the same temperature because it increases the temperature of the liquid.

• More walls keep a drink at the same temperature because there is more material for heat to pass through.

• The fewer the walls the better for keeping a drink at the same temperature because one wall allows for air to flow better.

The variable we change because we want to test it; only 1 independent variable per experiment.

Independent Variable

The variable we observe for effects caused by the change in the independent variable.

Dependent Variable

The variables that are kept the same to keep each test a fair test across an investigation.

Control Variable

Multiple Choice

What does the underlined portion represent in the following scenario?

Four friends to Flaming Grill & Supreme Buffet restaurant. They all have access to the exact same meals in the buffet line. But some friends are hungrier than others and eat more helpings of each dish. The more food someone eats, the higher the cost of their check.

• Independent Variable

• Dependent Variable

• Control Variable

Multiple Choice

What does the underlined portion represent in the following scenario?

Four friends to Flaming Grill & Supreme Buffet restaurant. They all have access to the exact same meals in the buffet line. But some friends are hungrier than others and eat more helpings of each dish. The more food someone eats, the higher the cost of their check.

• Independent Variable

• Dependent Variable

• Control Variable

Multiple Choice

What does the underlined portion represent in the following scenario?

Four friends to Flaming Grill & Supreme Buffet restaurant. They all have access to the exact same meals in the buffet line. But some friends are hungrier than others and eat more helpings of each dish. The more food someone eats, the higher the cost of their check.

• Independent Variable

• Dependent Variable

• Control Variable

In this experiment, the scientist wants to determine how tall the plant grows (dependent variable) after a certain amount of time. There are two steps the scientist needs to take in order to figure this out.

1. Measure how tall the plant is before the experiment.

2. Measure how tall the plant is after the experiment.

Fill in the Blank

Then, the scientist will subtract the initial height FROM the final height of the plant in order to calculate the __________ in the plant height over time.

Evaporation is the process
of water turning from a
liquid into gas.

The water molecules go up
into the air as water vapor.

Watch video clip (1:05 - 3:09)

https://youtu.be/wDYOtu6npNU?t=65

Draw

Draw a model of evaporation in a cup of water sitting in the sun.

Would water in a cup evaporate more quickly in a classroom at room temperature or outside on a hot day in July? Why?

Open Ended

What is an example of liquid evaporating into gas that you can think of from your everyday life?

Examples of Evaporation

●Steam rising from a hot cup of tea

●Puddles that have dried up

●Water sitting in a bowl that seems to disappear after a long weekend out of town

●Line drying clothes after washing them

●Ironing clothes (slightly damp clothes works best to get wrinkles out)