FL Science Fusion Unit 5 Review

Carlita hangs two balloons from a desk. When they hang normally, they are close together but they do not touch. Carlita rubs both balloons with a wool cloth. What happens when she lets the balloons hang near one another?

• They push one another apart.
• They touch one another and pop.
• They touch one another and stick together.
• They are close together but do not touch.

The balloons shown above are part of Eric's investigation into positive and negative charges. He rubbed both balloons with a wool cloth. 
What must be true of the balloons?

• They have the same charge.
• They have opposite charges.
• Neither of them has a charge.
• One of them has a charge and the other does not.

Olivia is combing her hair. After a while, she notices that the comb attracts the hairs on her head as shown above.
Which explanation best describes why the hairs are attracted to the comb?

• Combing the hairs caused them to lose their static charge.
• Combing the hairs caused the comb to lose its static charge.
• Combing the hairs gave them a charge that is opposite the charge on the comb. 
• Combing the hairs gave them a charge that is the same as the charge on the comb.

Maria is working on an art project. She needs a rusty iron nail for her artwork, so she places a shiny, new nail outside in a wet location. How will the air and water change the nail?

• It will dry out the nail.
• It will cause the nail to cool down.
• It will make the nail decrease in volume.
• It will cause the nail to chemically change.

Which figure shows light energy?

• A
• B
• C
• D

Three different groups of students made solar cookers. They wanted to see which of the cookers could make a pot of baked beans the hottest in 3 hours. Which of the following is one of the things they should do in their experiment?

• Use different types of beans in each cooker.
• Put the cookers in places with different amounts of sunlight.
• Use a thermometer to test each pot of beans at the end of 3 hours.
• Have a student taste the beans from 

An electron has a negative charge. What is true about the charge of a particle that is attracted to an electron?

• It is neutral
• It is positive
• It is negative
• It is repulsive

What effect will one positive charge have on another positive charge?

• They repel each other from a difference.
• They attract each other from a distance.
• They repel each other only when they touch.
• They attract each other only when they touch.

The picture shows a three-pronged plug. One of the flat prongs carries current from the supply that enters the electrical outlet, and the other returns the current to the service panel of the building. 
What would be a correct prediction for the purpose of the round prong?

• It also carries current from the outlet.
• It carries any extra current away, preventing a shock.
• It increases the amount of electric current entering the outlet.
• It decreases the amount of electric current entering the outlet.

You rub two balloons on your hair on a dry day. Your hair is attracted to both balloons. Then, you bring the balloons near one another. How would you describe what happens to the balloon?

• They repel one another.
• They attract one another.
• They neither attract nor repel one another.
• Opposite charges make one balloon become larger and one become smaller.