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WorksheetsNoncontact forces test
Total questions: 25
Worksheet time: 18mins
Which of these bests describes an electromagnet?
A permanent magnet made from electric currents.
A temporary magnet made from electric currents.
A temporary magnet made from magnetic currents.
What happens when two bar magnets repel each other?
The poles of the magnets pull toward each other.
The centers of the magnets pull toward each other.
The poles of the magnets push away from each other.
The centers of the magnets push away from each other.
When will the forces of gravity between two objects be the GREATEST?
when the masses of both objects are small and the objects are far apart
when the masses of both objects are large and the objects are close together
when the masses of both objects are small and the objects are close together
when the masses of both objects are large and the objects are far apart
All of the following are examples of static electric discharge EXCEPT:
lightning
getting shocked by a doorknob
the crackle sound as you pull clothes from the dryer apart
when your hair stands on end as you jump on the trampoline
Static discharge is when _____ jump from a charged object to one that is differently charaged
Protons
Neutrons
Electrons
Iron filings and bar magnets are placed on a piece of paper. Explain the pattern on the diagram below. Where is the magnetic field the strongest?
The magnetic field is only strong at the north pole
The magnetic field is only strong at the south pole
The magnetic field is strongest at the magnet’s poles.
if mass of an object is doubled, force of gravitation will be
a. halfed
b. doubled
c. increases 4 times
d. no change
You made an electromagnet to pick up pins. It did not pick them up until the nail was next to the pins. This is because
The smaller the distance between two electromagnets the greater the force.
As distance increases between two electromagnets the force becomes greater.
What would happen if you took one end of the wire off the battery?
The nail will be a magnet.
The nail would no longer be a magnet
Nothing will happened.
The nail will heats up.
Two balloons are hanging from a stick.
Both balloons have a positive charge.
How would you expect the balloons to move?
there would be no movement
towards each other
away from each other
The ball on the string is being repelled (pushed away) by the metal bar.
What must be the charge on the ball?
postivie
neutral
negative
Electrons have a _________________ charge.
neutral
positive
negative
Protons have a ________________ charge.
neutral
positive
negative
Which of the following is true?
Electric charge is transferred only when all objects have balanced charges.
Electric charge is transferred when electrons move.
Electric charge is transferred when protons move.
Electric charge is transferred when protons and neutrons change places.
The comb has been rubbed with a piece of wool fabric and placed next to some scraps of paper.
Some paper moves toward the comb. The movement of the paper is caused by
static electricity
mechanical energy
chemical energy
magnetic attraction
