Forces and Motion — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
Magnets attracts iron and steel but not wood.
Corrected: Magnets attract iron and steel but not wood.
In Grade 3 grammar, 'magnets' is plural, so the verb is 'attract' with no -s.
2. Fix the sentence:
Two north pole push each other apart.
Corrected: Two north poles push each other apart.
In Grade 3, 'two' tells us there is more than one, so we write 'poles' with an -s.
3. Fix the sentence:
A magnet work through thin paper to pull a paperclip.
Corrected: A magnet works through thin paper to pull a paperclip.
In Grade 3, 'a magnet' is singular, so the verb must be 'works' to match the subject.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. Magnets pull on objects made of iron or steel.
In Grade 3 science, magnets attract iron and steel but do not attract wood, plastic, or paper.
2. Two north poles pushed together will repel each other.
In Grade 3, like poles repel, so two north poles push apart instead of pulling together.
3. A north pole and a south pole will attract each other.
In Grade 3 science, unlike poles attract, so a north and south pole pull toward each other.
4. A magnet can work through a thin sheet of paper or plastic.
In Grade 3, magnets can still pull through thin, non-metal materials like paper or plastic.
Part C: True or False?
Read each statement. Circle True or False.
1. In Grade 3 science, a magnet will attract a wooden block.
True False
In Grade 3, wood is not magnetic, so a magnet will not attract a wooden block.
2. Two south poles placed close together will push apart.
True False
In Grade 3 science, two south poles are like poles, so they repel and push apart.
3. A magnet cannot pull a paperclip through a thin piece of paper.
True False
In Grade 3, magnets can work through thin paper or plastic and still pull a steel paperclip.