Unit Test 1 - Topic Energy

What unit do scientists use to measure power?

• Joule

• Watt

• Kelvin

• Newton

Which type of energy does not require a medium?

• Heat

• EMR

• Chemical

• All of the above

A woman lifts a heavy pot weighing 6.63kg up to 2 meters. How much work has she done?

• 130.08 J

• 32.50 J

• 13.26 J

• 32 J

The law of conservation of energy applies to:

• Energy transfer but not energy transformation

• Energy transformation but not energy transfer

• Both energy transfer and energy transformation

• No energy transfer and no energy transformation

Negative energy is considered a type of:

• EMR

• Thermal energy

• Potential energy

• Mechanical energy

What type of energy is represented by the food we eat?

• Heat

• EMR

• Chemical

• Nuclear

When energy changes from one form to another, the total amount of energy in the system:

• Increases

• Decreases

• Remains the same

• Changes

What determines the kinetic energy of an object?

• Mass and force

• Mass and distance

• Speed and force

• Speed and mass

An object is raised 10m above the ground and does not move. Which statement is correct?

• The object has mechanical energy.

• The object does not have mechanical energy.

• The object has some potential energy but no mechanical energy.

• The object has some kinetic energy but no mechanical energy.

The kinetic energy of a person weighing 40kg running at a speed of 3m/sec is how much?

• 60

• 120

• 180

• 360