Kinds of Energy
A ball rolls across the floor. What kind of energy does it have because it moves?
Motion energy
Energy moves from one object to another. What is this called?
Energy Transfer
What word means “how fast something moves”?
Speed.
Two objects bump into each other. What is this called?
A collision
You say what you think will happen before a test. What are you making?
A prediction.
A lamp helps you see. What kind of energy comes from the lamp?
Light energy
Your foot kicks a ball. The ball starts moving. Where did the ball get energy?
Energy moved from your foot to the ball.
Two cars travel the same distance. Car A takes less time. Which car has the greater speed?
Car A
A bat touches and pushes a ball. Is this a contact force? How do you know?
Yes. The bat and ball touch
You write what you saw during a test. Can you use this as evidence?
Yes. Evidence is what we observe or measure.
You hit a drum and hear a boom. What kind of energy reaches your ears?
Sound energy
A rolling ball hits a still ball. The still ball moves. How do you know energy moved between them?
The still ball started moving after the hit.
The same ball rolls slowly, then quickly. When does it have more motion energy?
When it rolls quickly.
A marble hits another marble straight in the middle. What kind of collision is this?
A direct collision.
You test how speed changes a collision. Should you use the same ball each time? Why?
Yes. Using the same ball keeps its mass the same.
A toaster warms bread. What kind of energy heats the bread?
Thermal energy, also called heat energy.
You clap your hands. Some motion energy changes into what kind of energy that you can hear?
Sound Energy
Two balls move at the same speed. One has more mass, or “stuff” in it. Which has more motion energy?
The ball with more mass.
A marble clips the side of another marble. What kind of collision is this? How might their motion change?
A glancing collision. They may move in different directions.
The same dough ball flattens more after a higher drop. This happens three times. What idea does this support?
A higher drop lets the ball gain more speed. The same ball moving faster has more motion energy.
A flashlight uses a battery. Name two kinds of energy in this example.
Chemical Energy = Battery
Light Energy = Flashlight
Electrical Energy = Wires
Thermal Energy = Bulb
A toy car hits a block and stops. Did its energy disappear? Explain.
No. Energy moved to other objects or changed form, such as into sound or thermal energy.
One ball has more mass. The other moves faster. Can we tell which has more motion energy from these facts alone?
No. Both mass and speed matter. We need more information.
A ball hits a wall and bounces away. What changes its direction?
The wall pushes on the ball during the collision. This causes reflected motion.
You change the ball’s mass AND its speed. Can you tell which change caused your result? How could you fix the test?
No. Change one thing at a time and keep the other conditions the same.