IPC - Unit 7 Practice Test Review
questions well answered already
passed
Friction - correct answer ✔✔Machines can never have an efficiency of 100% because they
create ___, which causes some energy to be lost as heat energy.
Geothermal energy - correct answer ✔✔Uses heat generated from magma to boil water, which
makes steam to turn turbines that generate electricity at a power plant.
Hydropower - correct answer ✔✔Creates electricity by converting the kinetic energy of falling
water at a dam.
Nuclear energy - correct answer ✔✔Creates electricity at power plants through controlled
fission reactions of radioactive elements.
Solar energy - correct answer ✔✔Can create electricity through the use of solar panels or
mirrors that heat up water.
Wind power - correct answer ✔✔Convert the kinetic energy of the wind into electricity through
a special turbine.
Biofuels - correct answer ✔✔___ are made from plants and animals, and some types are used
with or in place of gasoline.
Jane holds a heavy box while standing in line. - correct answer ✔✔In which scenario is work not
being done?
, - Jane holds a heavy box while standing in line.
- Fred walks to his desk.
- Danielle pushes a heavy box while walking to her car.
- Henry leans against a cardboard wall and falls over.
Inclined plane - correct answer ✔✔Has a slanted surface.
Wedge - correct answer ✔✔Made of two inclined planes and used to split things apart.
Wheel and axle - correct answer ✔✔Made of a wheel attached to a rod.
Screw - correct answer ✔✔A cylinder covered in ridges called threads that is used to hold
materials together.
Pulley - correct answer ✔✔Has a groove that a rope or cable can slide through.
Lever - correct answer ✔✔Made of a bar that rotates at a fixed point called a fulcrum.
Fossil fuels - correct answer ✔✔___ are made from ancient organisms that lived long ago.
Heat; work - correct answer ✔✔First law of thermodynamics: "The internal energy in a system
is equal to the ___ added to the system minus ___ done by the system."
chemical, electrical, light - correct answer ✔✔Which description best explains energy
transformations in a flashlight?
questions well answered already
passed
Friction - correct answer ✔✔Machines can never have an efficiency of 100% because they
create ___, which causes some energy to be lost as heat energy.
Geothermal energy - correct answer ✔✔Uses heat generated from magma to boil water, which
makes steam to turn turbines that generate electricity at a power plant.
Hydropower - correct answer ✔✔Creates electricity by converting the kinetic energy of falling
water at a dam.
Nuclear energy - correct answer ✔✔Creates electricity at power plants through controlled
fission reactions of radioactive elements.
Solar energy - correct answer ✔✔Can create electricity through the use of solar panels or
mirrors that heat up water.
Wind power - correct answer ✔✔Convert the kinetic energy of the wind into electricity through
a special turbine.
Biofuels - correct answer ✔✔___ are made from plants and animals, and some types are used
with or in place of gasoline.
Jane holds a heavy box while standing in line. - correct answer ✔✔In which scenario is work not
being done?
, - Jane holds a heavy box while standing in line.
- Fred walks to his desk.
- Danielle pushes a heavy box while walking to her car.
- Henry leans against a cardboard wall and falls over.
Inclined plane - correct answer ✔✔Has a slanted surface.
Wedge - correct answer ✔✔Made of two inclined planes and used to split things apart.
Wheel and axle - correct answer ✔✔Made of a wheel attached to a rod.
Screw - correct answer ✔✔A cylinder covered in ridges called threads that is used to hold
materials together.
Pulley - correct answer ✔✔Has a groove that a rope or cable can slide through.
Lever - correct answer ✔✔Made of a bar that rotates at a fixed point called a fulcrum.
Fossil fuels - correct answer ✔✔___ are made from ancient organisms that lived long ago.
Heat; work - correct answer ✔✔First law of thermodynamics: "The internal energy in a system
is equal to the ___ added to the system minus ___ done by the system."
chemical, electrical, light - correct answer ✔✔Which description best explains energy
transformations in a flashlight?
