Question

Previous Test Review Questions


Please read: The following questions are review questions from Units 2, 3, and 4. Remember, your tests are cumulative so you will see material from previous units on all tests.

If Mr. Jones was moved from Earth to the moon, what would change?(3 points)

height

mass

hair color

weight
Which of the following has the greatest potential energy? (3 points)

a 15 kg cat at underneath the tree

a 10 kg eagle's nest full of eggs at the top of a tree

a 10 kg bird below the squirrel

a 5 kg squirrel in the middle of the tree trunk
The faster an object moves the _____________ kinetic energy it has. (3 points)

less

same

not enough information

more
A(n) is created by passing current through a coil of wire wrapped about an iron core. (3 points)

motor

electromagnet

permanent magnet

generator
What will happen with the magnets below?



(3 points)

they will attract

not enough information to determine

nothing will happen

they will repel
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Answer 1

1) weight — Mass and hair color stay the same; weight changes because gravity is weaker on the Moon.

2) a 10 kg eagle's nest full of eggs at the top of a tree — gravitational potential energy depends on mass and height; this has a large height and a large mass.

3) more — Kinetic energy increases with the square of speed (KE = 1/2 mv^2).

4) electromagnet — A coil of wire with current around an iron core produces an electromagnet.

5) not enough information to determine — You need to know which poles are facing each other (or see the picture) to tell whether they attract or repel.