8.3 Forces at a Distance Review - Lessons 1-6

What did the dissected speaker contain at its very center?

• A magnet

• A battery

• A small motor

• A light bulb

Why is it important that the parts of the speaker system work together?

• To produce sound by vibrating

• To illuminate the membrane

• To cool down the speaker

• To color the foil

Which statement is true about the difference between a prediction and a hypothesis?

• A hypothesis involves a mechanistic explanation.

• A prediction is usually more detailed than a hypothesis.

• A hypothesis is a simple ‘if-then’ statement.

• Predictions are used to test theories.

In evaluating a hypothesis, students collect data to demonstrate?

• Cause-effect relationship

• Number of observations

• Types of variables

• Random patterns

When students develop models of speakers, what should they show?

• How parts work together to cause the speaker to vibrate

• The color of each part

• The weight of each component

• The age of each part

During the cause-and-effect observations, what statement framework should students use?

• When we make a change to the system, we observe the effect on the system.

• When we observe the system, we make a change to the system.

• When we change the system, we ignore the effect on the system.

• When we observe the effect, we change the system.

When comparing store-bought and homemade speakers, what should students look for?

• Similarities and differences in parts and their functions

• The cost of materials used

• The color of the speakers

• The size of the speakers

Why is a coil of copper wire placed inside a speaker?

• To create a magnetic field

• To make the speaker heavier

• To connect to the power source

• To add decoration

How can you make a simple speaker at home?

• By winding wire into a coil and using a magnet

• By using a balloon and some string

• By connecting it to a car battery

• By using only a magnet

What role does the magnet play in a speaker?

• It interacts with the coil to create vibrations

• It powers the speaker

• It changes the colors produced by the speaker

• It reduces noise