Student Number: Name: _____________________________ Room: _____ Date: __________________ Grade: 4 Unit 1: Magnetism and Electricity Science Homework _________________________________________________________________ _____ Homework packet link: https://sites.google.com/a/ccs-rams.org/pan/ 1. Circle the objects below that stick to magnet. steel screen soda straw aluminum nail iron nail steel paper clip rubber band brass ring black rock (magnetite) 2. Unlike poles ___________________. 3. Like poles ___________________. 4. ___________________ is a specific kind of force. 5. Every magnet has a north pole and ___________________. 6. A force is a push or ___________________. 7. A ___________________is an object that sticks to iron or steel. 8. When magnets push apart, we say they ___________________. 9. When magnets pull together, we say they ___________________. 10. The magnets shown on page 8 of the Science Resources book have one pole labeled. Which pairs of magnets will attract? Circle the letters below.
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Student Number:
Name: _____________________________ Room: _____ Date: __________________Grade: 4 Unit 1: Magnetism and Electricity Science Homework______________________________________________________________________
23. A ___________________ is something you use to gather evidence about
something you can’t see.
24. A ___________________is a magnet used to detect Earth’s magnetic field.
25. A student placed two compasses on a box to detect a square magnet that was hidden inside. The black square shows where the magnet was hidden. Which drawing shows how the compasses looked when she found the magnet? Circle the letter.
A B
C D
26. ___________________electricity is separation of positive and negative charge.
27. ___________________charge occurs when an object loses electrons.
28. An ___________________is a tiny particle that is part of an atom. It is responsible for
charge on objects.
29. Two objects ___________________ each other when both have positive charge
or both have negative charge.
30. ___________________charge occurs when an object has extra electrons.
31. Two objects ___________________ each other when one has positive charge
and the other has negative charge.
32. What causes two charged balloons to repel each other?
33. Wanda rubbed a plastic rod with a piece of wool. The rod had a negative charge. Then she rubbed a balloon on a string with the same piece of wool. When she brought the plastic rod close to the balloon, the balloon moved away from the plastic rod.
When Wand saw this, she knew the balloon(Circle the correct answer.)
A. must have had a negative charge.
B. must have had no charge.
C. must have had a positive charge.
34. A ___________________ is a pathway for the flow of electricity.
35. An electricity ___________________ is component that changes electricity into
another form of energy such as light or heat.
36. ___________________electricity flows from the negative end of the cell to the
positive end of the cell.
37. A ___________________ refers to more than one cell.
38. D-cells, bulbs, and wires are all circuit ___________________.
39. A short circuit is a direct pathway from one end of a battery to the other end.
40. Thomas Edison’s light bulb was an energy converter. What does that mean?
64. Look at the two bulb-and-battery circuits pictured below. Only one will light the bulb. Circle the one that you think will work.
65. Look at the pictures below. If the bulb will light or the motor will run, write “yes” in the box below the circuit. Write “no” if the bulb will not light or the motor will not run.
A B
C D
E F
66. A ___________________ circuit has two or more pathways for electric current to flow through.
67. What is the advantage of wiring two lightbulbs in parallel?
68. Look at the circuits below. If it is a series circuit, write S on the blank line above each drawing. If it is a parallel circuit, write P on the blank line.
A. B. C. D.
69. Draw schematic diagrams of the above circuits A and B in the boxes below.
schematic diagram of circuit A
schematic diagram of circuit B
70. ___________________ current is a flow or electricity through a conductor.
71. A ___________________is wire wound repeatedly around a central core.
72. An ___________________ is a coil of insulated wire, usually wound around a
core of iron or ___________________ which produces a magnetic field when
electricity flows through the wire.
73. The ___________________is the mass of iron or steel around which a wire is
wound.
74. If you put a compass near a wire that has a electricity flowing through it, the compass needle changes direction. The needle moves because(Circle the correct answer.)
A. it is lining up with Earth’s North Pole.
B. a compass needs electricity in order to work.
C. the electricity in the wire produces a magnetic field.
75. A ___________________ is a way to display the relationship between variables.
76. A ___________________ is an educated guess based on knowledge or
information.
77. How does the number of winds on an electromagnet core affect the strength of
79. Mark an X next to the materials you would need to build an electromagnet.
_____ wire _____ aluminum rivet
_____ motor _____ iron rivet
_____ D-cell _____ string
_____ lightbulb _____ switch (optional)
80. A ___________________is a set of signals that represents letters or words for sending messages.
81. A ___________________ is a device for sending coded messages by signals produced by closing and opening an electric circuit.
82. The ___________________ is the space between the steel strip and the electromagnet.
83. A telegraph ___________________is a switch that completes the circuit in a telegraph system.
84. Read “Morse Gets Clicking.” Using the present-day Morse code, decode these suggestions below from Morse when your telegraph does not have enough power to make a click.
A
A ____________________________________________
B
B ____________________________________________
85. Sarena heard that if you wind a wire around a rivet and connect the wire to a D-cell, you can make a magnet. She got some wire, wound it around an aluminum rivet four times, and attached it to a D-cell. She tried to pick up some paper clips, but nothing happened.
Below is the drawing she made to show what she had done. Help Sarena get her electromagnet to work by drawing what she needs to change.
Sarena’s drawing Your drawing aluminum rivet 4 winds
of wire
86. ___________________ – means craft or skill; -logy means science of - is using science to make something useful.
87. ___________________refers to something that is far away.88. Draw a circle around each device below that uses an electromagnet.
motor doorbell lamp earphones
89. Complete the circuits of these two telegraphs for two-way communication.