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1.
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Stnd 02: Non-Contact Forces
Two students
decided to use their knowledge about non-contact forces to build a hoverboard park. They embedded
thousands of bar magnets into the surface of the floor with the north poles facing up.
Hoverboard Skatepark | t | |
What would the
polarity of the bottom of the hoverboard have to be in order to overcome the non-contact force of
gravity (to levitate the board), and what kind of non-contact force would this
demonstrate?
a. | ---Hoverboards would not have any polarity since they
are made of aluminum.
---This would demonstrate nuclear
forces. | b. | ---The bottom of the hoverboard would have to be a north
pole.
---This would demonstrate
magnetism. | c. | ---The bottom of
the hoverboard would have to be a south pole.
---This would
demonstrate gravity. | d. | ---Instead of
magnets, they could simply mount wheels on the board.
---This
would demonstrate electrostatic force. |
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2.
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Stnd 02: Non-Contact Forces
The
first satellite was launched into orbit in 1957. Today there are over 2000 satellites in orbit.
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Two-Part
Question
Part One: Which non-contact force
keeps these satellites from being flung out into space as they orbit planet Earth?
Part Two:
Is this non-contact force attractive of repulsive?
a. | Part One: Magnetism is the non-contact forces
that keeps satellites in orbit.
Part Two: Magnetism is a repulsive (pushing) force.
| b. | Part One: Gravity is the non-contact forces that
keeps satellites in orbit.
Part Two: Gravity is a repulsive (pushing) force.
| c. | Part One: Gravity is the non-contact forces that
keeps satellites in orbit.
Part Two: Gravity is an attractive (pulling) force.
| d. | Part One: Electrostatic forces keeps satellites
in orbit around our planet..
Part Two: These forces are always attractive (pulling force).
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3.
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Stnd 02: Non-Contact Forces
Examine the
apparatus shown in the illustration containing two circular magnets. Notice that magnet A is
levitating above magnet B due to a non-contact force.
Illustration A |
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Which of the following statements
correctly describes what is happening in this diagram?
a. | The top of magnet B is positively charged, and the
bottom of magnet A is also positively charged. This is showing electrostatic repulsion (opposites
attract). | b. | The bottom of magnet A is a north pole, and the bottom
of magnet B is also a north pole. This is showing magnetic attraction (opposites
attract). | c. | The polarity of the top of magnet B is the opposite
polarity of the bottom of magnet A. This is showing wave refraction (waves
bending). | d. | The polarity at the top of magnet B is the same as the
polarity at the bottom of magnet A. This is showing magnetic repulsion (like
repels). |
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4.
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Stnds 01/23:
Electromagnetism
Examine the two models of
electromagnets shown below.
A group of students constructed a model of an electromagnet which
was able to lift two paper clips (see Model W above).
1) Ask Questions:
How does electricity moving through the wire
convert the nail into a temporary magnet? | 2) Define Problems:
Model W can only lift two paper
clips. What change would enbable it to lift more paper clips? | |
a. | 1) A non-contact force (gravitational attraction)
realigns the atoms in the nail.
2) One solution to this
problem is to add more batteries to the model. | b. | 1) The
electrostatic force is reflected through the wire causing diffusion of energy.
2) One solution to this problem is to move the batteries further away from the
nail. | c. | 1) A non-contact force (nuclear strong force) forms a
magnetic field in the nail.
2) To solve this problem, they
could use a plastic or glass core (see Model X). | d. | 1) Electrical current forms a magnetic field which realigns the atoms in the
nail.
2) One solution is to add more coils to the iron core
(see Model X above). |
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5.
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Stnds 01/23: Electromagnetism
Design
Task-Using 50 centimeters of copper wire, a bar magnet, and an amperage gauge, construct a device
that will induce electrical current (build an electrical generator).
Which one of these models successfully
accomplished the design task, and what is wrong about the other three models?
a. | Model Alpha is demonstrating magnetic attraction. All other models display
repulsion. | b. | Model Beta is an electrical generator. The other models merely show
magnets. | c. | Model Delta is inducing electricity. The other models merely show magnetic
fields. | d. | Model Beta is an electromagnet. All other models merely show magnetic
fields. |
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6.
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Stnd 23: A team of four students were asked
to create a model of an electrical generator. Each team member created one model displaying
electromagnetic phenomenon (see pictures below).
Select the model shown below that is
demonstrating electricity being induced.
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Multiple Response
Identify one
or more choices that best complete the statement or answer the question.
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7.
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Stnd 01: Magnetism and Electricity
MRI machines use magnetic fields from powerful electromagnets to create images
of the inside of a person’s body (see diagram below).
Magnetic
Resonance Imaging
(MRI) | | |
(Multi-Select Question)
How are the electromagnets in a MRI machine similar to all other
electromagnets, and how could a doctor increase a MRI machines’ magnetic field
(Select two
choices).
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8.
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Stnd 02: Non-Contact Forces
Non-contact forces can be either attractive or
repulsive.
Picture
01 | Picture 02 | Picture 03 | Picture 04 | | | | | | | | |
A student was asked to demonstrate that
fields exist between objects exerting forces on each other even though the objects are not in
contact. The results of this demonstration are shown above.
(Multi-Select Question) Select two pictures that show repulsion, and determine which kind of
non-contact force these pictures are displaying. (Select two choices).
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