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Questions and Answers
The sound travels in _______
The sound travels in _______
waves
We can see the shadows in:
We can see the shadows in:
- Night
- Day (correct)
- Day and night (correct)
Classify the following energy sources:
Classify the following energy sources:
Oil = Non-renewable Gas = Non-renewable Coal = Non-renewable The sun = Renewable Water = Renewable Wind = Renewable
Draw one example of shadow:
Draw one example of shadow:
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Study Notes
Forms of Energy
- Energy exists in various forms including kinetic, potential, thermal, chemical, electrical, nuclear, and sound energy.
Classification of Energy Sources
- Renewable Sources:
- The sun (solar energy)
- Water (hydropower)
- Wind (wind energy)
- Non-Renewable Sources:
- Oil
- Gas
- Coal
Shadows Observation
- Shadows are visible during the day due to the presence of light from the sun.
- During the night, shadows can still appear in the presence of artificial light sources.
- Shadows can be observed both during the day and at night depending on light conditions.
Sound Propagation
- Sound travels through different mediums:
- Water (sound travels faster in water than in air)
- Waves (sound travels as waves through different materials)
- Sound does not travel through solid objects as a primary medium; it needs a material medium like air, water, or solids.
Example of a Shadow
- Shadows can be illustrated by drawing a simple outline of an object blocking a light source, producing a silhouette on a surface.
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