WorksheetsStandard 5 (Elecctricity)
Total questions: 30
Worksheet time: 2hrs 3mins
What is Magnetism?
force.
power.
form of energy.
form of electricity.
A 10.0 kilogram mass of iron on earth exerts a downward force of 98 Newtons. On the moon this same 10.0 kilograms of iron is weighed and found to exert a downward force of 16.3 Newtons. How is this possible?
The earth is farther away reducing the pull.
Weight is the same everywhere, but mass changes.
Mass begins to evaporate in the vacuum of space.
The gravity on the moon is one sixth the gravity of Earth.
Four wrestlers step on a scale for a tournament. Wrestler A weighs in at 170 pounds; Wrestler B weighs in at 168 pounds; Wrestler C weighs in at 171 pounds; and Wrestler D weighs 169 pounds. Which of these wrestlers experience the greatest force due to gravity?
Wrestler A
Wrestler B
Wrestler C
Wrestler D
The variables_____ and ______ affect the gravitational force between objects.
Weight, mass
Volume, weight
Distance, mass
Rotation, distance
In each case, a charged rod, made of the dense rubber ebonite, comes close or is in contact with the top of an electroscope. The ball on the top of the electroscope is directly connected to the two metal leaves suspended in the flask. Which image represents a gaining of a charge on the the leaves of the electroscope by induction?
Sara and Greg built an electromagnet in science class. They wrapped 50 turns of copper wire around an iron nail and hooked the ends of the wire to a 1.5 volt battery. They picked up 15 paper clips with their electromagnet, but they want to make it stronger. What should they do?
Decrease the battery size.
Use a nail with a galvanized coating.
Wrap more turns of wire around the nail.
Replace the iron nail with a piece of steel.
In 1665 Sir Isaac Newton proposed the fundamental law of gravitation as a universal force of attraction between any two bodies. What does this theory state about the force that makes an apple fall and the force that keeps the moon in its orbit?
They are unpredictable.
They are the same force.
They can not be compared.
THey act in opposite directions
When we touch a Van de Graaff generator, our hair may stand up if it is dry. This happens only if the strands of our hair
Acquire atoms.
repel each other.
attract each other.
gain a negative charge.
When Jamie removes a woolen cap, his hair develops an excess of static charge Which of these BEST explains this
phenomenon?
Electrons are transferred from the woolen cap to Jamie’s hair.
Electrons are transferred from Jamie’s hair to the woolen cap.
Positive charges are transferred from the woolen cap to Jamie’s hair.
Positive charges are transferred from Jamie’s hair to the woolen cap.
The table shows results from an experiment in which objects made up of different materials are rubbed with each other. Based on the results, what can be predicted if an object made of rubber is rubbed with an object made of glass?
The glass object will become negatively charged, and the rubber object will remain neutral.
The rubber object will become negatively charged, and the glass object will remain neutral.
The glass object will become negatively charged, and the rubber object will become positively charged.
The rubber object will become negatively charged, and the glass object will become positively charged.
When an electric current is passed through an insulated wire that is coiled around an iron core, like a nail, what is created?
electromagnet
regular magnet
horseshoe magnet
North pole for a bar magnet
Mrs. Adams class decides to try an experiment. She rubs a blown up balloon on Sandy's head. After this, she takes the balloon and places it on the side of the wall, where it sticks, instead of falling to the ground. Also, Sandy's hair is now sticking almost straight out.
What causes Sandy's hair to act this way?
magic
wind currents
static electricity
current electricity
This is a force that acts over a distance, can not be seen, and causes like poles to repel and opposite poles to attract. What is this force?
gravity
friction
magnetism
air resistance
If you hold a balloon by a string and the balloon moves toward your sweater and sticks there, what would you infer?
That the balloon and the sweater have no charges.
That the balloon and the sweater have like charges.
That the balloon and the sweater have neutral charges.
That the balloon and the sweater have opposite charges.
Jim shot an arrow at the target but missed. In fact, the arrow was nowhere in sight! "Don't worry" said Jim's buddy. "It is probably lying on the ground on the other side of the target." "How do you know that?" asked Jim.
"Because of ________", answered his buddy.
the force of gravity
the pull on your bow
the force of the wind
the curve of the earth
Braddy connected the lose wire to the battery and created an electromagnet. He picked up 45 thumb tacks with his electromagnet, though his goal was to pick up 50 thumb tacks. What could Braddy do to increase the strength of his electromagnet and pick up more thumbtacks?
use fewer coils of wire
use a screw instead of a nail
use two batteries instead of one
replace the nail with a piece of steel
Jake has four pairs of horseshoe magnets in different sizes. He experiments by moving each pair farther and farther apart. Which pair of magnets will attract each other at the farthest distance?
the largest pair of magnets
the smallest pair of magnets
the third largest pair of magnets
the magnets all have the same amount of attraction
You can watch static electricity in action by rubbing an inflated balloon against your hair. Your hair will actually stand on its end! It does this because each hair becomes charged, and they all repel one another.
However, eventually, your hair will return to normal. Why is this?
The charge accumulated in your hair eventually just disappears.
The charge accumulated in your hair is eventually converted to neutral particles.
The charge accumulated in your hair is eventually broken down by the nuclear force.
The charge accumulated in your hair is eventually transferred to the surrounding environment
The area in which the attraction and the repulsion of a magnet's poles are felt is a(n)
charged field.
electric field.
magnetic field.
repulsion field
Sandy rubs a rubber rod with a piece of animal fur. The total charge of the system before rubbing is zero. The system is made up of the rubber rod and the fur. Initially, the charge on the rod is zero and it is electrically neutral. The same is true for the fur.
When Sandy rubs the rubber rod with the fur, the rubber rod acquires negative (-) charges. How does the system change, overall, based on the law of conservation of charge?
The total charge of the system is now negative rather than neutral.
Although the rod becomes negatively charged, the piece of fur remains neutral.
If the rod becomes negatively charged, then the fur becomes positively charged.
Both the rod and the piece of fur have become negatively charged during the rubbing.
Static electricity occurs when two objects have different electrical charges. When objects are rubbed together, the electrons from one object can hop to the other, causing them to take on a positive or negative charge. Positively charged objects repel each other, so when your hair stands on end, that is due to a positive electrical charge transferred from another object, usually a hat or hair brush.
What would be one way to avoid static electricity?
Dry cotton fabrics and synthetic fabrics separately.
Run a metal clothes hanger across your dry hair.
Use a blow dryer to dry your hair.
Wear shoes with rubber soles.
In order to generate electricity from mechanical energy, one essential element needed to transform the energy into electrical energy is
a steam turbine
a mechanical linkage.
a large piece of iron.
a magnet or magnetic field.
An electric generator transforms mechanical energy into electrical energy. This process could be done by which of these?
Using wind to spin a magnet around.
Connecting a battery to a coil of wire.
Turning a wheel that contains electrons.
Spinning a coil of wire near a large magnet.
The distance between a proton and an electron is cut in half. How does the force of attraction change?
The force becomes twice as much.
The force becomes one-half as much.
The force becomes four times as much.
The force becomes one-quarter as much.
An electromagnet is a temporary magnet made by coiling wire around an iron core which becomes a magnet when an electric current flows through the wire.
How could the strength of an electromagnet be increased?
Use fewer coils of wire around the nail.
Use more coils of wire around the nail.
Use a battery with less voltage.
Use a smaller nail.
A student wants you to demonstrate that an electric current will produce a magnetic field.
Which set of objects could be used to demostrate this?
A battery, a coil of wire and a compass.
A compass, some paper clips and a battery.
A battery, an iron nail and a long copper wire.
An iron nail, a permanent magnet and a battery.
A leaf electroscope is a device that indicates the existence of electric charge on an object. The leaves spread apart when an object is brought near or touches the electroscope. What observation would suggest that the object touched the electroscope?
The leaves remained apart after the charged object was removed.
The leaves slowly came back together after the charged object was removed.
The leaves spread apart a lot when the charge was brought near the electroscope.
No observation could help determine if the charged object touched the electroscope.
Looking at the electroscope, describe how you can cause the two leaves at the bottom to repel each other and stay that way.
Bring a positive and negative object near the top.
Bring a negative object near the top.
Bring a positive object near the top.
Touch the electroscope with any charged object.
The attracting and repelling forces of magnets are used in countless objects, from refrigerator doors to maglev trains. Refrigerator doors use the attraction of magnets to stay closed, while maglev trains use magnetic repulsion to hover above rails. The center magnet in the picture is hovering between two magnets, making it appear to float. Which best explains how the center magnet is able to hover between two other magnets?
The opposite poles of each magnet are facing each other, so they repel.
The magnets are stacked so that similar poles are facing one another.
The middle magnet is repelling the top magnet while attracting the bottom.
The middle magnet is attracted to the top magnet, but held down by gravity.
The basic concept of how a simple motor works is explained by which statement?
When a fan blows on a wire, it causes it to spin, creating a force.
When a fan blows on a wire, it causes it to spin, creating an electrical current.
When a wire that carries electrical current is placed in zero gravity, the wire experiences a force.
When a wire that carries electrical current is placed in a magnetic field, the wire experiences a force.
