Forces and Motion — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A bigger push makes an object move faster than a smaller push.
Grade 3 Science shows that stronger pushes give objects greater speed or distance.
2. Two equal forces in opposite directions will cancel each other out.
Grade 3 learners see opposite equal forces produce balanced forces and no motion change.
3. The direction of a force tells which way an object will move.
Grade 3 Science explains direction of force decides the path an object takes.
4. A harder kick sends a ball a farther distance than a light tap.
Grade 3 students learn that bigger forces move objects over longer distances.
5. When two kids push a wagon the same way, the forces add together.
Grade 3 Science teaches same-direction forces add up to a larger total push.
6. If you push a toy car left and a friend pushes right with equal force, it stays still.
Grade 3 learners see balanced opposite forces keep objects at rest in NGSS 3-PS2.
7. The size of a push affects how fast an object moves.
Grade 3 Science shows force size determines the speed change on an object.
8. A gentle push on a swing makes it move slower than a hard push.
Grade 3 students learn smaller forces produce smaller changes in motion.
9. Forces have both size and direction in Grade 3 Science lessons.
Grade 3 Science teaches every force has a strength and a way it points.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Big push on a ball
→ Ball rolls far and fast
Ball rolls far and fast
Two equal opposite pushes
→ Object stays still balanced
Object stays still balanced
Two pushes in same direction
→ Forces add for bigger motion
Forces add for bigger motion
Small push on a wagon
→ Wagon moves slowly a short way
Wagon moves slowly a short way
Grade 3 NGSS 3-PS2 connects size and direction of forces with the motion they produce.