Law of Conservation of Energy

Examine the diagram. What two types of energy does the kinetic energy of the cars transform into?

• Sound Energy

• Light Energy

• Potential Energy

• Kinetic Energy of the Flying & Deforming Car Parts

Tags

NGSS.MS-PS3-5

Within the alarm clock seen here, energy is transformed. It is time to get up! The alarm clock goes off. What are the energy transformations taking place in your alarm clock?

• electrical to magnetic to sound

• electrical to mechanical to sound

• electrical to mechanical to light

• chemical to electrical to mechanical

How would you describe the relationship between the mass of a car and its kinetic energy?

• As the mass of a car increases, its kinetic energy increases.

• As the mass of a car increases, its kinetic energy decreases.

• As the mass of a car decreases, its kinetic energy increases.

• There is no clear relationship between mass and kinetic energy.

Tags

NGSS.MS-PS3-1

This is the standard unit for measuring energy.

• Joules

• Newtons

• Matter

• Mass

Examine the diagram. If you doubled the mass of each car involved in the crash, what would happen to the total amount of energy in the system?

• The total energy in the system will increase.

• The total energy in the system will decrease.

• The total energy in the system will remain constant.

• None of these

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A force that resists the motion of one surface over another is ______________.

• friction

• potential

• energy transformation

• kinetic

A microwave oven changes ____________ energy to radiant energy to __________ energy.

• electrical, kinetic

• potential, kinetic

• potential, thermal

• electrical, thermal

According to the ____________________, energy cannot be created or destroyed.

• kinetic

• law of conservation of energy

• energy transformation

• potential

Tags

NGSS.HS-PS3-2

The hand generator works by turning the handle which lights up the bulb. What energy transformation occurs as the handle is turned?

• Thermal to electrical

• Electrical to mechanical

• Mechanical to electrical to light

• Light to electrical

A cheetah can run briefly with a speed of 31.0 m/s. Suppose a cheetah with a mass of 47.0 kg runs at this speed. What is the cheetah’s kinetic energy?

• 1457 Joules

• 22,584 Joules

• 15 Joules

• 45,167Joules

Tags

NGSS.MS-PS3-1