types of energy
Sara is riding her bicycle on a flat road. Suddenly, she starts pedaling faster. What type of energy is increasing?
Kinetic energy.
Lina climbs to the top of a slide but does not go down yet. What type of energy does she have at that moment?
Gravitational potential energy
Ali stretches a rubber band with his fingers. Before he lets go, what type of energy does the rubber band have?
Elastic potential energy.
A girl eats an apple before running a race. How is her body using energy from the apple?
Chemical energy in the apple turns into kinetic energy for running
A soccer ball is rolling on the field but slows down and stops. Where did its kinetic energy go?
It turned into heat due to friction with the ground.
Adam is carrying a book. He places it on a table and leaves. Does the book still have energy? If yes, what type?
Yes, gravitational potential energy.)
Two children are standing on a staircase. One is on the second step, and the other is on the fifth step. Who has more GPE and why?
The child on the fifth step because they are higher up
A basketball player pushes down on the ball before shooting it. What happens to the ball’s energy when it is pushed?
It stores EPE, which turns into kinetic energy when released
A car is parked in a driveway with a full tank of gas. Where is the energy stored?
In the chemical energy of the fuel.
A person lights a candle, and the wax slowly melts. What energy transformation happened?
Chemical energy to heat and light energy.
A chef is cooking soup on a stove. The soup starts to boil. What kind of energy is causing this change?
heat energy
a diver is standing on a high diving board, getting ready to jump. What happens to their energy as they step off?
GPE changes into kinetic energy as they fall
A group of students are jumping on a trampoline. How does the trampoline use energy to help them jump higher?
The stretched surface stores EPE, which turns into kinetic energy when released.
A battery is placed inside a flashlight, and the light turns on. What energy transformation happened?
Chemical energy to light and heat energy
A roller coaster goes up a hill and then comes down at high speed. Describe the energy changes
GPE at the top changes into kinetic energy as it moves down.
A firefly glows at night while flying. What two types of energy does it use?
Light energy and kinetic energy
A teacher holds a piece of chalk above the ground. She drops it. Explain what happens to the energy before and after it falls.
Before: GPE. After: Kinetic energy as it falls
A toy car is pushed backward against a stretched spring inside a launcher. What happens when the spring is released?
The EPE turns into kinetic energy as the car moves forward.
A campfire is burning, and the flames are heating a pot of soup. What energy transformation is happening?
Chemical energy from wood turns into heat energy for the soup
A slingshot is stretched back, and then the rock is released. Explain the energy changes that happen in this process
EPE → Kinetic energy when the rock moves forward.
A windmill’s blades turn when the wind blows. What two types of energy are involved in this process?
Wind energy (kinetic) and mechanical energy
A boulder is resting at the edge of a cliff. The wind starts blowing strongly. What could happen to its energy if the wind pushes it off?
GPE will turn into kinetic energy as it falls.
A gymnast bends her knees and pushes off the ground to jump into the air. What type of potential energy does she use, and how does it change?
EPE in her legs changes into kinetic energy as she jumps
A scientist mixes two liquids in a test tube. After a few seconds, the test tube becomes warm. What happened to the chemical energy in the liquids?
It turned into heat energy
A dam holds back a river. When the water is released, it moves through turbines to generate electricity. What are the energy transformations happening?
GPE (stored water) → Kinetic energy (moving water) → Electrical energy