Forces and Motion

👩‍🏫 Teacher’s Guide

Objective

Explain that forces (pushes and pulls) change an object's motion, speed, and direction.

Vocabulary

• — A push or a pull
• — Movement of an object
• — The way something moves
• — Equal forces; no change in motion
• — Unequal forces; motion changes

Teaching Notes

Model pushes/pulls with light objects. Use arrows to show direction and length to show strength.

Answer Key

Balanced = no change in motion; Unbalanced = motion begins or changes.

Extension Ideas

Students design a 'force poster' using arrows to show pushes and pulls they used today.

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🧒 Student Worksheet

Concept and Helping Material

A force can start, stop, or change how something moves. We show forces with arrows. A longer arrow means a stronger push or pull. If arrows are equal, the object does not change motion. If arrows are not equal, the object speeds up, slows down, or turns.

Words to Learn

• A push makes the box move ___.
  - A pull makes the cart move ___.
  - The arrow shows the ___ of the force.
  - Two equal forces are ___ forces.

Sentences to Fill In

• The forces on the book are ___ (balanced / unbalanced).
  - The longer arrow shows a ___ (stronger / weaker) force.
  - A push is a kind of ___ (force / motion).
  - If forces are balanced, motion ___ (changes / does not change).
  - We use arrows to show ___ (direction / color).

Hands-On Experiment — Balloon Rocket Line

What You Need

balloon, straw, tape, string, two chairs

What You Do

Thread string through straw, tie between chairs. Tape balloon to straw, blow balloon, release and observe motion and direction.

Reflection

• How did the direction of the force affect the balloon's path? (Answer may vary.)
• When would forces be balanced in this setup? (Answer may vary.)