Gravity and Motion

Overview

In this lesson, students explore how gravity affects the motion of objects. Through a short investigation, they observe and describe patterns related to falling and projectile-like movement, linking evidence to scientific explanations.

Learning intentions

• Students will describe gravity as a force that acts on objects and influences their motion.
• Students will predict how an object’s motion changes when gravity is the main force affecting it.
• Students will conduct and record observations from a simple experiment related to gravitational effects.
• Students will use evidence to explain motion using scientific vocabulary.

Success criteria

• I can describe gravity as a force that pulls objects toward Earth.
• I can observe and record what happens to moving objects when gravity acts on them.
• I can use my data/observations to explain the relationship between gravity and motion.
• I can communicate my findings clearly using appropriate science language.

Curriculum links

• Motion and forces in everyday contexts, including gravitational effects.
• Scientific investigation skills: forming a question, making predictions, collecting and organizing data, and drawing conclusions from evidence.
• Use of appropriate scientific vocabulary to explain observations.
• Analysis of patterns in results to support explanations.

Lesson structure (45 minutes)

1. 0–5 min: Activate prior knowledge

• Students respond to a quick prompt: “What forces can change an object’s motion?” Collect a few ideas (e.g., friction, gravity, pushing/pulling).
• Teacher clarifies the unit focus: in this lesson, gravity’s role will be the main focus.

2. 5–10 min: Mini-lesson—gravity and motion

• Teacher models a scenario: dropping a ball from different heights or a slow roll that then falls off a surface.
• Students discuss in pairs: “What does gravity do over time?” and “How do we know?”
• Teacher introduces/refreshes key terms: force, gravity, direction (toward Earth), fall, speed, motion path.

3. 10–17 min: Build predictions

• Students make predictions for the investigation setup (teacher displays the materials).
• Each group writes: predicted outcome, what they will measure/observe, and which variable they will keep the same.
• Teacher emphasizes fairness: same start position, similar method, consistent timing approach.

4. 17–33 min: Experiment—observe gravitational effects

• In groups of 3–4, students run the investigation and record observations.
• Suggested investigation options (choose one based on resources):
• Option A: Dropping comparison: Drop a small object from two heights (e.g., desk height vs. higher point). Record time to hit a target surface using stopwatches or a phone timer, and note how the object behaves.
• Option B: Motion then fall: Release a small cart onto a short track so it rolls off the end and falls into a catch surface. Record horizontal distance and/or where it lands.
• Students repeat each trial twice to improve reliability and record results in a simple table.

5. 33–40 min: Analyze results—look for patterns

• Students identify trends: Do observations change when height changes? Does direction consistently pull objects downward?
• Teacher prompts: “What stayed the same?” “What changed?” “What does that suggest about gravity’s role?”
• Groups draft a short evidence statement: “Based on our observations, gravity causes…”

6. 40–45 min: Consolidation and exit ticket

• Whole class share: 2–3 groups present one key observation and one conclusion.
• Exit ticket (individual): “Using evidence, explain how gravity affects objects in motion.” Include at least one sentence about direction and one about what changes (e.g., speed, path, time).

Resources

• Small objects suitable for dropping (e.g., metal/plastic ball, foam ball, small model car)
• Timer devices (stopwatch or classroom phone timer) for each group
• Measuring tools (meter sticks or tape measures) and labels for drop heights/starting positions
• Simple data tables on paper or clipboards (height, trial 1 time, trial 2 time, observation)
• Catch surface or landing area (paper towels, foam pad, taped landing markers)
• Safety equipment: clear floor/space, student gloves optional if needed, eye protection if objects are heavier
• Whiteboard/markers for teacher model and group conclusions
• Sentence frames for ESL support (e.g., “Gravity is a force that… It acts by… I observed that…”)

Assessment

• Formative assessment through observation of group work (prediction quality, fair testing, accurate recording).
• Formative assessment using the exit ticket to check understanding of gravity’s impact and students’ ability to use evidence.
• Summative-in-form concept check in analysis: students should identify a pattern and connect it to an explanation.

Differentiation

• Support for ESL learners:
• Provide sentence frames and word bank (force, gravity, direction, toward Earth, speed, fall, path, evidence).
• Allow oral rehearsal with a partner before writing the prediction and conclusion.
• Use visuals: arrows showing direction of gravity and diagrams of the setup.
• Support for students needing scaffolding:
• Provide partially completed data tables and an example of a “good” evidence statement.
• Assign roles in groups (timer, recorder, materials manager, reporter) to reduce cognitive load.
• Extension for advanced learners:
• Ask students to propose an additional test (e.g., different object types) and predict how results might change or stay consistent.
• Challenge them to refine explanations using causal language (e.g., “Because… therefore…”).
• SEN considerations:
• Offer reduced writing demands (short bullet conclusions) while still requiring the science idea and evidence.
• Check understanding with quick verbal questions during the investigation rather than only written products.

Unit/lesson breakdown (long-range plan)

• Unit title: Exploring Systems in Motion
• Unit purpose (15 lessons): Build understanding of how forces and interactions influence motion, using evidence from investigations and data interpretation.

1. Lesson 1: What motion looks like—speed, distance, and motion descriptions (baseline investigation).
2. Lesson 2: Forces as interactions—push/pull examples and everyday evidence.
3. Lesson 3: Friction—how surfaces change motion and what patterns look like in data.
4. Lesson 4: Balanced vs unbalanced forces—link to changes in motion.
5. Lesson 5: Measuring motion—using graphs/representations at an intro level.
6. Lesson 6: System thinking in motion—what counts as a system and why assumptions matter.
7. Lesson 7: Designing fair tests—variables, controls, and reliability.
8. Lesson 8: Investigating friction and drag-like effects—data collection and interpretation.
9. Lesson 9: Gravity overview—how it affects falling and why it matters in real motion.
10. Lesson 10: Gravity’s Role in Motion (current lesson).
11. Lesson 11: Projectiles and motion paths—evidence-based descriptions of curved paths.
12. Lesson 12: Energy and motion links (qualitative)—how changes relate to forces.
13. Lesson 13: Real-world applications—safety design and motion systems.
14. Lesson 14: Student inquiry—design, conduct, analyze, and communicate results.
15. Lesson 15: Unit synthesis—argumentation with evidence and reflection on learning.

If you share what experiment materials you have (e.g., track, cart, photogates, available timers), I can tailor the investigation steps and data table to match your classroom setup exactly.