Energy--Unit 5

Sara observes different types of energy on the playground. She sees a falling leaf and a bouncing ball. She also sees a child swinging and a child at the top of a slide. Which activity has only potential energy?

• falling leaf

• bouncing ball

• child swinging

• child at the top of a slide

What is a definition of the word energy?

• the force of speech

• having strength or power

• natural resources

• the ability to cause a motion or change

Robbie presses down on a spring. Which tells how the energy changes when he releases the spring?

• Electrical energy becomes sound energy.

• Potential energy becomes electrical energy.

• Potential energy becomes kinetic energy.

• Potential energy becomes light energy.

Shania loves to dance. She turns on her radio to find some music. Which statement explains how the radio uses energy?

• Light energy changes into sound energy.

• Sound energy changes into electrical energy.

• Electrical energy changes into sound energy.

• Sound energy changes into mechanical energy.

After polishing a table, Jessica was able to see herself in it. Which sentence best explains this?

• The table reflected light.

• The table refracted light.

• The table produced light.

• The table absorbed light.

Rosita shined a flashlight down a hallway. The light could be seen along the hallway but not around the corner. Which sentence best explains this?

• Light can be reflected.

• Light is a form of energy.

• Light travels in a straight line.

• Light moves faster than sound.

There is a row of trees along the edge of a lake. During the day, Jorge can see images of the trees on the surface of the lake. Which term best describes what Jorge observes?

• absorption

• reflection

• refraction

• transmission

Yoko put a flashlight on a table so the light shined on a wall. She put a piece of cardboard in front of the flashlight and could no longer see the light on the wall. What most likely happened to the light when it reached the cardboard?

• The cardboard destroyed it.

• The cardboard absorbed it.

• It was refracted outward in all directions.

• It was reflected onto the wall.

A lighthouse produces a bright beam of light as shown below. The light travels in a straight line. Which will absorb the beam of light?

• a mirror

• a waterfall

• a glass window

• the side of a cliff

Ms. Pham’s students show that light travels in a straight line. They punch a hole in two pieces of paper. Two students hold the papers so the holes line up. Another shines a light through one hole, and it shines through the other as well. How can they best share their observations?

• in a graph

• in a chart

• in a table

• in a drawing