Law of Conservation of Mechanical Energy (Joules)

Who was the German scientist highly interested in an experiment involving an Archimedean screw?

• Julius Robert Mayer

• Galileo Galilei

• Isaac Newton

• Albert Einstein

Answer explanation

The German scientist highly interested in an experiment involving an Archimedean screw was Julius Robert Mayer, making him the correct choice.

What did James Prescott Joule convert mechanical energy into?

• Light energy

• Heat energy

• Sound energy

• Chemical energy

Answer explanation

James Prescott Joule converted mechanical energy into heat energy.

Tags

NGSS.HS-PS3-3

According to the law of conservation of energy, what happens to the total mechanical energy in a system during any process?

• It decreases

• It increases

• It remains the same

• It fluctuates

Answer explanation

According to the law of conservation of energy, the total mechanical energy in a system remains the same during any process, as energy cannot be created or destroyed, only transferred or transformed.

Tags

NGSS.MS-PS3-5

In the sample problem provided, what is the kinetic energy of the fruit as it lands?

• 150 joules

• 100 joules

• 250 joules

• 200 joules

Answer explanation

The correct answer is 150 joules because the kinetic energy formula is KE = 0.5 * mass * velocity^2, and in this case, KE = 0.5 * 2 kg * 10 m/s^2 = 100 joules.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

What is the common source of energy among plants?

• Nuclear energy

• Solar energy

• Geothermal energy

• Wind energy

Answer explanation

Plants primarily use solar energy for photosynthesis, making it their common source of energy.

Tags

NGSS.MS-LS1-6

What type of energy is stored due to the movement of elastic objects like springs?

• Chemical energy

• Thermal energy

• Nuclear energy

• Elastic potential energy

Answer explanation

Elastic potential energy is stored due to the movement of elastic objects like springs.

What is a safety precaution taken in designing loops in roller coasters?

• Making them frictionless

• Making them narrower

• Making them higher than the slope

• Making them half the height of the highest point

Answer explanation

The safety precaution taken in designing loops in roller coasters is making them half the height of the highest point.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

What classic machine dates back to the 1800s and spearheaded the industrial revolution?

• Electric car

• Steam locomotive

• Submarine

• Airplane

Answer explanation

The classic machine that dates back to the 1800s and spearheaded the industrial revolution is the Steam locomotive.

What is used to convert heat into mechanical energy in a steam engine?

• Oil

• Natural gas

• Coal

• Water

Answer explanation

Coal is used to convert heat into mechanical energy in a steam engine.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

What is the common form of energy loss in energy transformations?

• Light energy

• Sound energy

• Heat energy

• Chemical energy

Answer explanation

The common form of energy loss in energy transformations is heat energy.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5