3rd Grade Science : Physical Science
Study concepts, example questions & explanations for 3rd Grade Science
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Example Questions
Example Question #14 : Magnets To Solve Problems
Melissa needs to solve a common problem using magnets for a classroom project. How can she use magnets to solve a common problem?
None of the answer choices are correct.
All of the answer choices are correct.
Glue a magnet to a long stick and let the glue dry. Use the stick to grab metal things too high to reach.
Attach a magnet to a freezer door and the frame and push the door closed so the magnet touches. Now the door will stay closed.
Roll up a bag of chips, place a magnet on either side of the roll, and connect them. The bag stays closed, and chips remain fresh.
All of the answer choices are correct.
Melissa could use any of the solutions for her class project. All of the solutions use a magnet to solve a common problem and are reasonable ideas. Keeping a bag sealed, reaching metal objects up high, and keeping a door closed are all issues a magnet (or two) could solve.
Example Question #15 : Magnets To Solve Problems
Mrs. Allen always loses her glasses. She doesn't want to wear them on her head or around her neck, and she doesn't always have pockets to put her glasses in. They are made of metal. She has brick walls and a magnetic whiteboard in the classroom. What could she do to keep her glasses handy using a magnet to solve the problem?
Hang her glasses up on the whiteboard by attaching the metal arms to a magnet stuck to the board.
There is no way to use a magnet to keep her glasses somewhere handy.
Carry the glasses around in her hand attached to a magnet, so they don't fall.
Hang her glasses up on the brick wall by attaching the metal arms to a magnet stuck to the wall.
Hang her glasses up on the whiteboard by attaching the metal arms to a magnet stuck to the board.
Mrs. Allen wants to keep her glasses handy but doesn't want to wear them on her neck, head, or in a pocket. Her glasses are made of metal, and she has a magnetic whiteboard so she could use a magnet to attach them. Placing the magnet on the board and then attaching the glasses to the magnet will keep them from getting lost, and they will be in an easy to find place.
Example Question #2 : Apply Scientific Knowledge About Magnets To Create A Solution
Gluing magnets onto the sides of salt and pepper shakers, so they don't get separated is a solution to a common problem.
True
False
True
The statement in the question is true. A common problem is something that can often happen and in someone's everyday, ordinary life. Salt and pepper shakers are sold as a set but can easily get separated if someone sets one down and forgets about it rather than putting them back together. If they have magnets attached to the sides of them, they can be stuck together, so they never get separated.
Example Question #16 : Magnets To Solve Problems
Mindy needs to get iron filings out of a pile of sand, rice, and dirt in science class. The iron filings are tiny and fine so they blend in and disappear with the mixture. What would be the best tool to remove the filings from the sand?
Magnet
Sifter
Tweezers
Microscope
Magnet
Using scientific knowledge about magnets and their capabilities can help solve problems that we face in the real-world. If Mindy needs to remove the iron filings, she can use a magnet to remove them from the sand, dirt, and rice. The sand, dirt, and iron filings would slip through the sifter because they are so tiny, tweezers would not be able to sort the small filings out of the mixture, and a microscope would help Mindy see the iron filings better but would not help her separate them.
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