Unit 8 Review Flashcards
True or False
Energy is the ability to cause a change in structure or motion
true
True or False
The major source of Earth’s energy is the sun
true
True or False
Plants use the light energy from the sun to make their own food to grow. Animals and humans then eat the plants for their own fuel
true
True or False
Energy is destroyed in plants to make food
false
True or False
Energy is neither created nor destroyed
true
True or False
Energy disappears when light is absorbed
false
True or False
Energy can convert from one form to another
true
Give 2 examples of change or transfer of energy when a human cuts logs with a chainsaw
Chemical energy from the gas ->mechanical energy for the sawing
Chemical energy in the muscles -> mechanical energy to hold and move the chain saw
Explain how a machine converts energy from one form to another
Chemical energy in fuel -> mechanical energy in moving truck
Explain how a living thing can convert energy from one form into another
Trees growing: light energy from the sun -> chemical energy in trees
lifting logs: chemical energy in muscles -> mechanical energy to lift logs
cheering: chemical energy in muscles -> mechanical energy in lungs -> mechanical energy in air from lungs -> mechanical energy in vocal cords -> sound energy while cheering
Which type of resources form slowly. Much more slowly than we use them?
non-renewable
Which type of resources can be replaced at least as fast as they are used?
renewable
What are renewable resources?
- Wind
- Wood
- Water
- Sun
Oil is a fossil fuel that takes millions of years to form. Oil is an example of which type of resource?
non-renewable
How can energy be used?
It can be used to make the electricity that powers houses and businesses
