8 th Grade

The ability to do work is called A. velocity B. energy C. conversion D. friction B

Energy is measured in units called A. joules B. pounds C. meters D. horsepower A

The energy associated with motion is called A. kinetic energy B. elastic potential energy C. gravitational potential energy D. nuclear energy A

Kinetic energy increases as A. mass increases and velocity decreases B. mass decreases and velocity increases C. both mass and velocity increase D. both mass and velocity decrease C

Moving water can be used to produce electricity because A. most forms of energy can be converted into other forms B. energy cannot be converted into other forms C. potential energy can be converted into kinetic energy, but not vice versa D. kinetic energy can be converted into potential energy, but not vice versa A.

What type of conversion is taking place when natural gas is used to heat water? A. chemical to thermal B. thermal to mechanical C. mechanical to electromagnetic D. electromagnetic to chemical A

When you rub your hands together on a cold day, you use friction to convert A. mechanical to thermal B. thermal to nuclear C. nuclear to electrical D. electrical to electromagnetic A

The scientist who suggested that energy can be created under certain conditions was A. Newton B. Einstein C. Wright D. Pascal B

The rate at which energy is transferred is called A. Joules B. Power C. Work D. Time B

Niagara Falls is a good example of A. kinetic energy being converted into potential energy B. potential energy being converted into kinetic energy C. energy being lost D. energy being created B

Visible light is an example of A. chemical energy B. electrical energy C. electromagnetic energy D. nuclear energy C.

What type of energy does a spinning turbine have? A. electrical B. nuclear C. thermal D. mechanical D

When generators spin turbines, they A. produce nuclear energy B. store potential energy C. produce electricity D. burn fossil fuels C

Unlike kinetic energy, potential energy is A. energy of motion B. stored C. conserved D. not measurable B

The type of energy stored by fossil fuels such as coal is A. kinetic B. mechanical C. chemical D. electromagnetic C

The process of burning a fuel is called A. combustion B. meltdown C. acceleration D. conduction A.

Energy Transformations Where is the greatest potential energy? The top baseball Where is the greatest kinetic energy? On the side going down Where is the least potential energy? On the side going down Where is the least kinetic energy? The top baseball

Fossil fuels contain energy that originally came from A. tidal forces B. Earth’s core C. the sun D. dinosaurs C

What type of energy is released when fossil fuels are burned? A. electrical B. nuclear C. kinetic D. chemical D

A pole-vaulter first converts kinetic energy into A. thermal B. chemical C. mechanical D. elastic potential D

How would you calculate an object’s mechanical energy? A. Add its kinetic and potential energies B. Multiply its kinetic and potential energies C. Subtract its kinetic energy from its potential energy D. Subtract is potential energy from its kinetic energy A

True or False When fossil fuels are burned, they release energy stored thousands of years ago. FALSE MILLIONS

True or False If you add an object’s potential and kinetic energies, you get its mechanical energy TRUE

True or False During combustion, a fuel’s electromagnetic energy is converted into thermal energy. FALSE CHEMICAL

True or False A ball thrown into the air has its greatest kinetic energy as it reaches the highest point in its path. FALSE POTENTIAL

True or False In a machine, work output is less than work input because some energy is converted into thermal energy. TRUE

Energy Transformations Is the potential energy Changing at position 5? No it is neither increasing Or decreasing.

True or False A light bulb converts electrical energy into electromagnetic energy. TRUE

True or False An ice cube melts when its mechanical energy increases. FALSE THERMAL ENERGY

True or False A compressed spring has elastic potential energy. TRUE

True or False The kinetic energy of a book on a shelf is equal to the work done to lift the book to the shelf. FALSE GRAVITATIONAL POTENTIAL ENERGY

True or False When work is done on an object, the object gains energy. TRUE

An electric motor converts electrical energy to ____________ energy. Mechanical

The law of ______________ states that energy cannot be created or destroyed. CONSERVATION OF ENERGY

Energy Transformations How is the kinetic and potential energies changing at position 2? Potential is decreasing Kinetic is increasing Describe kinetic and potential Changing at position 4? Potential is increasing Kinetic is decreasing Is the potential energy Changing at position 5?

Fossil fuels contain _________ energy stored millions of years ago. CHEMICAL

In coal-fired power plants, coal is burned to produce __________, which is then used to turn a turbine. STEAM

Work is the transfer of ________ from one object to another. ENERGY

Mechanical energy is associated with the ________ and motion of an object. POSITION

As a pendulum swings, energy is continuously transformed between kinetic energy and ________ energy. POTENTIAL

The energy transformation in a car’s engine are an example of __________ transformations. MULTIPLE

A baseball flying through the air has ___________ energy because of its motion. KINETIC

As water runs over a waterfall, its potential energy is converted into _________ energy. KINETIC