Unit 3 Science Review

An insulator is often used to help regulate an object’s temperature. Which of the following is true about

an insulator?

• it slows energy transfer

• it can also be a good conductor

• it allows heat to pass through easily

• it provides heat to keep materials warm

When you apply force on an object, such as pushing a heavy piece of furniture across the room, it creates mechanical energy.

• True

• False

Lillian turns on her desk lamp to read her book. Which of the following describes what is occurring in order for the lamp to produce light?

• the circuit is opened, turning the light off

• the circuit is closed, turning the light off

• the circuit is opened, turning the light on

• the circuit is closed, turning the light on

Sam tries to build an electric current using a battery, a light bulb, a paper clip, and copper wire. She

wants to demonstrate that an electric circuit travels in a closed path. The diagram shows what

she builds. Which statement explains the problem with her circuit?

• The circuit lacks an energy source.

• The circuit lacks a wire connecting the bulb to the battery.

• The light bulb uses the electric current.

• The paper clip stops the electric current.

A student wanted to see if a toy car would roll differently on different types of floor surfaces. The

student decided to construct a ramp using tile floor, wood floor, and carpeted floor. The experiment was

designed to test the effects of which of the following forces?

• Gravity and magnetism

• Magnetism and friction

• Magnetism and force

• Gravity and friction

In the diagram, what should be labeled at #3?

• negative terminal

• load

• power source

• copper wire

Look at the drawing of the electrical circuit and determine which of the following statements is true

about the circuit?

• The light bulb is on

• The electrical circuit is working

• The electrical circuit is open

• The electrical circuit is closed

What is energy?

• A push or a pull.

• What is needed to do work or change

• Something that you cannot easily separate

• A Red Bull.

A bobsled glides across ice and gradually begins to slow down. Which force acts against the bobsled’s

motion?

• thrust

• friction

• weight

• gravity

Bobby pushes his toy box across the room. What kind of energy is happening?

• sound

• light

• electrical

• mechanical