This Grade 3 Science worksheet helps students distinguish between balanced and unbalanced forces using relatable examples. Learners explore a tug of war tie, a book sitting still on a table, and a ball rolling downhill. Through sentence correction, fill-in, and true-or-false items, Grade 3 students see how equal forces cancel out while unequal forces create motion changes, aligning practice with NGSS 3-PS2-1 standards for beginner forces work.
Style:
Forces and Motion
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
A book sitting still on a table has unbalanced forces.
Rewrite: A book sitting still on a table has balanced forces.
2. Fix the sentence:
In a tug of war that is tied, the forces are unbalanced.
Rewrite: In a tug of war that is tied, the forces are balanced.
3. Fix the sentence:
A ball rolling downhill shows balanced forces.
Rewrite: A ball rolling downhill shows unbalanced forces.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. When forces are equal and opposite, they are balanced forces.
2. When one side pushes harder than the other, forces are unbalanced.
3. A book sitting still on a table has balanced forces acting on it.
4. A ball rolling downhill is moved by unbalanced forces.
Part C: True or False?
Read each statement. Circle True or False.
1. Balanced forces cause no change in motion in Grade 3 Science lessons.
True False
2. A tied tug of war shows unbalanced forces in Grade 3 examples.
True False
3. Unbalanced forces can make a ball roll faster in Grade 3 Science.
True False
Forces and Motion
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
A book sitting still on a table has unbalanced forces.
Rewrite: A book sitting still on a table has balanced forces.
2) Fix the sentence:
In a tug of war that is tied, the forces are unbalanced.
Rewrite: In a tug of war that is tied, the forces are balanced.
3) Fix the sentence:
A ball rolling downhill shows balanced forces.
Rewrite: A ball rolling downhill shows unbalanced forces.
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) When forces are equal and opposite, they are balanced forces.
2) When one side pushes harder than the other, forces are unbalanced.
3) A book sitting still on a table has balanced forces acting on it.
4) A ball rolling downhill is moved by unbalanced forces.
★ Part C: True or False?
Read each statement. Circle True or False.
1) Balanced forces cause no change in motion in Grade 3 Science lessons.
True
False
2) A tied tug of war shows unbalanced forces in Grade 3 examples.
True
False
3) Unbalanced forces can make a ball roll faster in Grade 3 Science.
True
False
Ready to Practice?
Complete each section carefully.
10 Questions
15-20 minutes
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