Gr. 7 - The Law of Conservation of Energy

What does the law of conservation of energy state?

• a) Energy can be created but not destroyed

• b) Energy cannot be created or destroyed, only changed into other forms

• c) Energy disappears when it is used up

• d) Energy can only stay in one form

When you pump your legs on a swing, what happens to your energy?

• It disappears once you stop pumping

• It stays in your body and doesn’t move anywhere

• It transfers into the swing as mechanical energy

• It turns into light energy

Why does a light bulb feel hot after being on for a while?

• The light bulb is storing energy inside

• The heat is caused by friction inside the wires

• The heat comes from the surrounding air

• Some of the electrical energy is transformed into heat energy

Which type of energy does a roller coaster have at the very top of the track?

• Kinetic energy

• Thermal energy

• Sound energy

• Potential energy

What happens to some of the energy as a roller coaster rushes down the track?

• It disappears completely

• It turns into sound energy and heat energy from friction

• It stays as potential energy

• It turns into electrical energy

What kind of energy does your body store from food?

• Chemical energy

• Electrical energy

• Light energy

• Sound energy

Why do you feel warmer when you exercise?

• Your body uses extra potential energy

• Your body is absorbing heat from the air

• Some of your body’s energy transforms into heat

• The energy turns into light energy

Which of these is NOT an example of energy transformation mentioned in the video?

• Electrical energy turning into light energy

• Motion turning into heat and sound

• Energy being destroyed when you stop swinging

• Electrical energy turning into thermal energy

What should you remember when you see energy change forms (like when you ride a bike or heat lunch)?

• The total amount of energy stays the same

• Energy can only stay in one form

• Some of the energy disappears forever

• Energy can be destroyed if enough force is used

When you stop pumping a swing, what slows it down?

• Gravity and air resistance

• Lack of potential energy

• The loss of all energy in the swing

• The swing creating new energy