Unit 2.2 Conservation of Energy Lesson

Multiple Select

When you turn on a lamp, all of the electrical energy is changed into........................................................... and.........................................

• light energy

• sound energy

• chemical energy

• thermal energy

Multiple Choice

Which specific type of energy is at point A?

• Potential Energy
• Kinetic Energy
• Mechanical Energy
• None

Multiple Choice

If a lot of the energy that you put in isn't wasted, then the machine is .......................................

• efficient

• not efficient

Multiple Choice

The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed 
• Energy cannot be created or destroyed, it can only transformed
• Energy can't be created, destroyed or transformed

Multiple Choice

The SI Unit for Energy is

• Joule

• Potential

• Calorie

• Kilojoule

Multiple Choice

If the Total Mechanical Energy is 50J, Potential Energy is 40 J, what is the Kinetic Energy?

• 1 J
• 10 J
• 90 J

Multiple Choice

The law of energy conservation says the total energy before the change _______ the total energy after it

• is less than
• is more than
• affects
• equals

Multiple Choice

Which specific type of energy is at point B?

• Potential Energy
• Kinetic Energy
• Mechanical Energy
• None

Multiple Choice

If 4000J of energy is transferred and 2500J is usefully stored, how much energy is wasted?

• 6500J

• 1500J

• 3250J

Multiple Choice

What is the wasted energy here? (we want movement)

• heat, light and sound

• chemical, electrical and movement

• Sound, sound and sound

Multiple Choice

What is the wasted energy here? (we want light)

• electrical

• heat

• movement

Multiple Choice

What is the wasted energy here? (we want movement)

• electrical

• heat

• sound

Multiple Choice

What is the wasted energy here? (we want light)

• electrical

• chemical

• heat

Multiple Choice

What type of device might this Sankey be about?

• A very efficient LED light bulb
• A very inefficient incandescent light bulb
• A coal power plant
• A wind turbine

Multiple Choice

In energy transformations, "wasted energy" usually takes what form?

• heat
• chemical energy
• light
• sound waves

Multiple Choice

Which bulb is the most efficient?

• Filament bulb

• LED light

• CFL lamp

Multiple Choice

Where does most of the energy go in this transformation.

• Electrical energy
• Light
• Heat
• other

Multiple Choice

Where does most of the energy go for this transformation.

• heat
• electrical
• light
• joules

Multiple Choice

Which of the following devices transforms electrical energy into mechanical energy?

• An e-reader
• a fan
• a manual pencil sharpener
• ipod

Multiple Choice

In an electric drill, the input energy is electrical energy. Which of these is wasted output energy?

A – Sound energy B – Kinetic energy C – Heat energy

• A, B

• A, C

• B, C

• B

Multiple Choice

In a microwave oven, the input energy is electrical energy. Which of these is useful output energy?

A – Sound energy B – Kinetic energy C – Heat energy

D – Light energy

• A, B, C

• A

• B, C, D

• C

Multiple Select

Potential energy depends on the ________ and ________ of the object.

• Height (position)

• Mass

• Speed

• Friction

Multiple Choice

Which point has the most potential energy?

• G

• F

• B

• A

Multiple Choice

The faster an object moves, the ________ kinetic energy it has.

• more

• less

Multiple Choice

What is energy?

• rate of work
• Motion of an object
• ability to do work
• force over time

Multiple Select

Kinetic energy depends on the ________ and ________ of the object.

• Height (position)

• Mass

• Speed

• Friction

Multiple Choice

The equation KE = 1⁄2 mass x velocity² is used to find which type of energy?

• Kinetic Energy

• Potential Energy

Multiple Choice

The equation PE = mass x gravity x height is used to find which type of energy?

• Kinetic Energy

• Potential Energy

Multiple Choice

If the height is zero, gravitational potential energy

• is zero

• at its maximum

• 100J

• 200J