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WorksheetsCSA UNIT 4 REVIEW
Total questions: 10
Worksheet time: 10mins
Electric forces in static electricity also act across distances, forming electric fields, but not magnetic fields. However, static electric charges have north and south poles that can attract or repel each other: positive (+) and negative (-) charges attract since they are opposite, while like charges (-) and (-) or (+) and (+) repel.
Students investigating electrically charged objects are predicting which objects will repel and which objects will attract to each other.
Which of the following predictions are MOST LIKELY to be correct?
A negatively charged comb and positively charged bits of paper will repel.
A negatively charged balloon and a negatively charged sock will attract.
A negatively charged balloon and positively charged bits of paper will attract.
Negatively charged hair and positively charged bits of paper will repel.
Attracted particles lose potential energy while repelled particles gain potential energy.
Attracted particles gain kinetic energy while repelled particles lose kinetic energy.
The diagram below represents two small charged particles near a large positively charged object.
Both particles are moved closer to the positively charged object.
Which of the following statements correctly compares the potential energy changes of the two particles?
The positively charged particle loses potential energy, and the negatively charged particle gains potential energy.
Both of the charged particles lose potential energy.
The positively charged particle gains potential energy, and the negatively charged particle loses potential energy.
Both of the charged particles gain potential energy.
Which of the following BEST describes the relationship between magnetism and electricity in an electromagnet?
magnetic fields are created by the flow of electric currents
electricity makes magnets attract nonmetals they normally cannot
electric currents prevent magnetic fields from forming
magnets convert magnetic energy into electrical energy
magnets convert magnetic energy into electrical energy
Two airplanes are flying in the sky in such a way that the gravitational attractions between them decreases.
Which best explains how planes must be flying?
Faster than the speed of sound.
Towards each other.
Next to each other at the same speed.
Away from each other.
When you climb to the top of a water slide, you are gaining_______________.
gravitational kinetic energy.
gravitational potential energy.
chemical kinetic energy.
chemical potential energy.
A student is given a piece of iron in science class. She is told that the piece of iron may or may not be a magnet.
Which of the following actions would best help the student to determine whether or not the piece of iron is a magnet?
Comparing the mass of the iron to the mass of a magnet.
Bringing the iron near a nonmagnetic piece of iron.
Bringing the iron near an electrically charged piece of tape.
Comparing the appearance of the iron to a picture of a magnet.
Two balloons are given an electrostatic charge by rubbing them with a wool cloth.
Which observation provides the best evidence of the force that the balloons exert on each other over a distance because of their charge?
Moving Balloon 1 can make Balloon 2 move without the balloons touching.
The charge on the balloons gets weaker over time until there is no charge.
The amount of rubbing with the wool cloth can change the amount of charge.
Both Balloon 1 and Balloon 2 are pulled downward by the force of gravity.
Select each correct answer. More than one answer may be correct.
Charlotte built the simple electromagnet shown. Charlotte found that the electromagnet picked up only one paper clip when she turned it on.
If Charlotte wants her electromagnet to pick up more clips, which of the following changes could help her?
Increasing the distance between the electromagnet and the paper clips.
Increasing the number of turns in her electromagnet's coil.
Increasing the number of batteries supplying voltage to her electromagnet.
Increasing the size and weight of the paper clips.
Students build an electrostatic charge on the surface of two balloons by rubbing them with wool cloth. Placing the balloons close to each other allows the balloons to exert a force on each other.
This creates a system of ___________ .
electrostatic potential energy
gravitational potential energy.
electromagnetic kinetic energy.
electrostatic kinetic energy.
How can a magnet be used to produce an electric current?
Connect a wire to each end of the magnet.
Hold the magnet next to a wire.
Spin the magnet around inside a coil of wire.
Wrap wire around the magnet.
