NGSS
3-PS2-1
4 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Grade 3 Science · Chapter 1 · Lesson 1
Balanced and Unbalanced Forces
It is the difference that moves things.
Grade 3 Science · Chapter 1 · Lesson 3
Change one thing. Write down what you kept the same.
Grade 3 Science · Chapter 1 · Lesson 4
A force you cannot see, doing something you can measure.
Grade 3 Science · Chapter 1 · Lesson 5
Designing a Fair Investigation
Plan it, run it, and argue for what you found.