Forces and Motion — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. A pattern of motion can be used to predict future motion.
Grade 3 Science teaches motion patterns let us predict future movement (NGSS 3-PS2-2).
2. A swing goes back and forth in a repeating pattern.
Grade 3 learners see pendulums create regular patterns that help predict motion.
3. When a force stops acting, friction can slow an object down.
Grade 3 Science shows friction is a force that reduces speed over time.
4. A ball thrown straight up comes back down because of gravity.
Grade 3 students learn gravity pulls every object toward the ground in Grade 3 lessons.
5. A rolling ball will keep going until a force stops it.
Grade 3 Science teaches motion continues until a new force like friction acts.
6. If you push harder, the object moves with more speed.
Grade 3 learners connect stronger forces with higher object speeds in NGSS 3-PS2.
7. The path an object takes is called its direction of motion.
Grade 3 Science uses direction to describe the way objects travel.
8. When no forces act, a resting object stays at rest.
Grade 3 students learn objects stay at rest when forces are balanced or absent.
9. A pendulum swinging the same way each time shows a regular pattern.
Grade 3 Science explains regular patterns help predict future motion in experiments.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Swing pendulum
→ Repeats back and forth
Repeats back and forth
Friction on floor
→ Slows a rolling toy
Slows a rolling toy
Gravity on dropped apple
→ Pulls it straight down
Pulls it straight down
No forces acting
→ Object stays at rest
Object stays at rest
Grade 3 Science links forces and situations to predictable patterns of motion.