Unit 3: Energy Review

Which of the following best describes the energy transformations that occur when a flashlight that runs on batteries is turned on?

• chemical → light → electrical
• electrical → light → chemical
• light → electrical → chemical
• chemical → electrical → light

The Theory of the Conservation of Energy states -

• Energy can be created, just not destroyed. It changes its form from one type to another.
• Energy can never be created nor destroyed. It can only change its form from one type to another.
• The total energy in our Universe changes, as different forms of energies can be transformed from each other under certain circumstances.
• Energy transformations do not passively occur in our lives, rather we actively make use of energies and transform energies.

What is energy?

• It's too hard to define

• The ability to do work

• The same as power

• Matter that has been destroyed

Why are energy and work (W = Fd) both measured in joules?

• Because of forces

• They both depend on mass

• One can be exchanged for the other

• The acceleration of gravity is a constant

The motion of an object is called _____?

• flowing energy

• kinetic energy

• potential energy

• sun energy

Which is the best example of something that has kinetic energy?

• a basketball rolling across a court

• a car parked on a steep hill

• a picture hanging on the wall

• a piece of wood before it's burned

The stored energy of an object is called ______?

• flowing energy

• kinetic energy

• potential energy

• sun energy

Which kind of energy change occurs when a candle is burning?

• Chemical to light.
• Light to electrical.
• Solar to heat.
• Chemical to electrical.

The Electrical Energy of the stove is transferred to _____ Energy.

• Solar
• Thermal
• Potential
• Electrical

Energy transformations occur when...

• energy is created through conduction
• energy changes from one form to another
• two forces slide together that are touching
• a chemical reaction takes place