Science - ENERGY Machines at Work (Day 4)

ENERGY - Day 4

Machine's at Work

TODAY’S TARGET: Identify some basic forms of energy including light, heat, sound, electrical, chemical, and mechanical.​

Multiple Choice

Burning a candle uses chemical energy to produce heat and light. Many things that produce light also produce heat. Which of the following examples of things that produce light DOES NOT directly use chemical energy to produce light?

• a fire

• fireworks

• ceiling light

• a match

​MACHINES at WORK

​There are four kinds of chemical changes that we investigated earlier this year. They were rusting, cooking, burning, and decaying. Rusting, cooking, and decaying can’t really be used to power too many others things, but burning can. In fact, burning is used to power most of the forms of energy we use.

Multiple Choice

The 4 types of chemical changes were rusting, cooking, burning, and _________.

• light

• fire

• building

• decaying

​For example, one of the first machines to use burning as a source of energy was the steam engine. Burning coal or wood produced heat energy that was used to produce steam. Steam inside the boiler tank produced pressure, which caused the machine to run. Steam engines are still used today.

Multiple Choice

A steam engine is a...

• ...game.

• ...power source.

• ...vehicle.

• ...living thing.

Multiple Choice

A steam engine used this fuel:

• oil

• paper

• iron

• coal

​Some machines, such as cars, trucks, trains, airplanes, and boats, use gasoline (gas), diesel, or oil powered engines. Most cars burn gasoline to produce the mechanical energy to move the car. Some cars and trucks use diesel, which is another form of fuel to power their engines. Large ships use a kind of oil to burn to power their engines. Trains and airplanes use special kinds of fuels to power their engines. Two things are in common with all of these machines: they all burn some kind of non‐renewable fossil fuel, and all of them produce mechanical energy.

Multiple Choice

Two things are in common with all of these machines: _____________________________________________

• they all burn some kind of mechanical fuel, and all of them produce non-renewable resources

• they all burn some kind of non‐renewable fossil fuel, and all of them produce mechanical energy.

• they all use electricity to run

• they all burn some kind of fuel and all of them produce light energy

​There are more and more cars available today that don’t use fossil fuels. They use batteries to produce electricity to power the car. The chemicals inside batteries, whether powering a car or a flashlight, can be used to produce electricity when needed.

Multiple Choice

How do electric cars work?

• batteries power an electric motor which turns the wheels
• electricity powers a gas engine
• nobody knows
• it has a long extension cord

Multiple Choice

What are some advantages of electric cars?

• Doesn't use fossil fuels

• Good for the environment

• Can use non-renewable electricity

• All of the above

Multiple Choice

Fireworks use chemical energy to put on a good show. What form of energy is NOT produced in a fireworks show?

• electrical

• sound

• chemical

• light

Multiple Choice

Which statement best defines Mechanical Energy?

• Energy produced by a machine or moving part.

• Energy that is produced by an electrical current in a circuit.

• Energy from the sun.

• Energy that travels in waves due to vibrations.