Energy Forms
What type of energy does a moving bicycle have?
Kinetic Energy
When you clap your hands, some motion energy changes into what type of energy you can hear?
Sound energy.
When you touch a warm mug, thermal energy moves from the mug to what?
Your hand.
What is it called when two objects hit each other?
A collision.
What type of energy travels from a flashlight to help you see a map?
Light energy.
What type of energy is stored in food and batteries?
Chemical Energy
What type of energy changes into light and thermal energy when a lamp is switched on?
Electrical energy.
A balloon is placed in a freezer. Will the air particles inside generally move faster or slower?
Slower.
What happens to the motion of a soccer ball when a player kicks it?
Energy transfers from the foot to the ball, causing it to move.
What type of wave allows you to hear a guitar playing across a room?
Sound waves.
A book resting on a high shelf has what type of stored energy?
Potential energy (gravitational potential energy).
When wood burns in a campfire, what stored energy changes into heat and light?
Chemical energy.
Why might a balloon left in the hot sun get bigger?
The air warms, particles move faster, and the gas expands.
Two identical balls roll toward each other. What information about their motion would help you predict the collision?
Their speeds (and directions).
What energy change happens when an electric toaster heats bread?
______ energy → ______ energy.
Electrical energy → thermal energy.
Which has more kinetic energy: a car moving at 20 mph or the same car moving at 60 mph?
The car moving at 60 mph.
A battery-powered toy car moves across the floor. Name the 3 step energy changes that make it move.
______ → _________→ _______
Chemical → electrical → kinetic energy.
Why does ice melt when you hold it in your warm hands?
Thermal energy transfers from your warmer hands to the colder ice.
Why does pulling a rubber band farther back usually cause a toy car to travel faster?
More potential energy is stored and can transfer into more kinetic energy.
A golfer hits the same ball with a gentle putt and then a stronger putt. Which will usually travel farther on the same surface?
The stronger putt, because the ball starts with more kinetic energy.
A stretched rubber band is holding stored energy. What type is it, and what does it become when released?
(Elastic) potential energy becomes kinetic energy.
A student says energy disappears after a moving ball stops. Explain why this is incorrect.
Energy is transferred or transformed into other forms, such as heat and sound; it is not destroyed.
DAILY DOUBLE
Three identical balloons are placed in the sun, an air-conditioned room, and a freezer. Rank their air particles from fastest to slowest.
________→ ________→ ______
Sun → air-conditioned room → freezer.
A marble rolls into modeling clay. Why does a faster marble usually make a deeper dent?
It has more kinetic energy and can cause a larger change in shape during the collision.
A laser cutter uses electrical energy to produce a beam that cuts wood. What energy causes the wood to heat up and change shape?
Light energy from the laser is absorbed and converted into thermal energy.