The Force of Gravity

Active learning helps fifth graders grasp gravity because the concept of a center-seeking force is abstract and tied to their daily experience. When students manipulate objects and observe patterns, they build mental models that connect the invisible force of gravity to concrete outcomes like falling speeds and weight differences.

• 5th Grade
• Science
• 3 activities
• 20 min–40 min

Learning Objectives

1. Explain that gravity is a force that pulls objects toward the center of the Earth.
2. Analyze how gravity influences the motion of objects on Earth and celestial bodies in the solar system.
3. Compare the effect of Earth's mass on an object's weight using a hypothetical scenario.
4. Predict how gravity would affect an object's motion if Earth's mass were different.

Think-Pair-Share

⏱ 20 min·Pairs

Think-Pair-Share: Which Way is Down?

Show students a globe with small figures attached at multiple locations: the US, Australia, Brazil, and Norway. Partners draw arrows showing the direction gravity pulls each figure and discuss what they notice about all four arrows. The class shares and identifies that every arrow points toward the center of the globe , not 'down' as a floor reference.

Prepare & details

What keeps the oceans from falling off the Earth?

Facilitation Tip: During the Think-Pair-Share, have students point to Earth’s center on a classroom globe when describing where gravity pulls.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Inquiry Circle

⏱ 40 min·Small Groups

Inquiry Circle: Gravity Drop Tests

Groups simultaneously drop identical objects from the same height: a tennis ball, a crumpled paper ball, and a flat sheet of paper. They record results and work to separate the effect of air resistance from gravity, building a data-based argument about whether gravity pulls harder on heavier objects.

Prepare & details

How does gravity affect the movement of planets in our solar system?

Facilitation Tip: For the Gravity Drop Tests, provide identical balls of different weights and ask students to predict outcomes before dropping them to highlight gravity’s consistent force.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Inquiry Circle

⏱ 30 min·Small Groups

Structured Discussion: If Earth Were More Massive

Give students the prompt: Earth's mass doubles overnight. What happens to your weight? To the moon's orbit? To the atmosphere? Small groups build a cause-and-effect chain using what they know about gravitational force and orbital motion, then share their reasoning with the class for peer questioning.

Prepare & details

What would happen to an object's weight if Earth's mass doubled?

Facilitation Tip: In the Structured Discussion, use a visual of Earth’s mass doubling to anchor reasoning about weight changes.

Setup: Groups at tables with access to source materials

Materials: Source material collection, Inquiry cycle worksheet, Question generation protocol, Findings presentation template

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Teaching This Topic

Teach gravity by grounding abstract ideas in observable evidence. Avoid over-relying on demonstrations alone; instead, pair them with student predictions and explanations to confront misconceptions directly. Research shows that students hold onto ideas like 'heavier objects fall faster' until they see counter-evidence and discuss it with peers.

What to Expect

Successful learning looks like students describing gravity as a force that always pulls toward Earth’s center, not just toward the ground. They should explain why objects fall at the same rate regardless of mass and predict how changes in Earth’s mass would affect weight.

Watch Out for These Misconceptions

Common Misconception

During Think-Pair-Share: 'Gravity pulls things down, and down is toward the floor.'

What to Teach Instead

Use the classroom globe and mini-figures placed on different continents to have students draw arrows showing gravity pulling each figure toward Earth’s center. Ask them to compare their arrows to the classroom floor’s orientation.

Common Misconception

During Gravity Drop Tests: 'Heavier objects fall faster because gravity pulls harder on them.'

What to Teach Instead

Provide two balls of equal size but different weights. Have students predict which will hit the ground first, then drop them simultaneously. Use their observations to redirect their thinking to gravity’s equal acceleration.

Assessment Ideas

Exit Ticket

After Gravity Drop Tests, ask students to draw a falling object with an arrow showing gravity’s direction and write one sentence explaining why the object falls toward Earth’s center.

Quick Check

During Structured Discussion, present the question: 'If Earth’s mass doubled, would you weigh more, less, or the same? Explain using the terms mass and gravity.' Listen for mentions of gravity increasing due to greater mass.

Discussion Prompt

After Think-Pair-Share, facilitate a class discussion using the key question: 'What would happen to an object’s weight if Earth’s mass doubled? How might this change affect things on Earth?' Assess understanding by listening for reasoning that connects mass to gravitational force.

Extensions & Scaffolding

• Challenge students to design a test comparing the fall speed of a flat piece of paper versus a crumpled one, then explain the role of air resistance.
• Scaffolding: Provide pre-labeled diagrams of Earth with arrows pointing to its center for students to annotate during the Think-Pair-Share.
• Deeper exploration: Ask students to research how gravity varies on other planets and compare their weights if they stood on each one.

Key Vocabulary

gravity	A natural force of attraction that exists between any two objects with mass. On Earth, it pulls objects toward the planet's center.
mass	The amount of matter in an object. More mass means a stronger gravitational pull.
weight	The measure of the force of gravity on an object. It changes depending on the strength of the gravitational field.
orbit	The curved path an object takes around a star, planet, or moon, due to the force of gravity.