Exploring Our World: Scientific Inquiry and Discovery · 3rd Year · Forces and Motion · Spring Term

Investigating Pushes and Pulls

Students will explore how pushes and pulls can start, stop, or change the direction and speed of objects.

• NCCA Curriculum Specifications
• NCCA: Primary - Energy and Forces
• NCCA: Primary - Forces

About This Topic

Pushes and pulls are fundamental forces that cause objects to start moving, stop, speed up, slow down, or change direction. In this topic, third-year students explore these effects through structured investigations, such as rolling balls with varying push strengths or pulling toys across surfaces. They analyze how stronger forces produce greater changes in motion and compare outcomes when applying forces at different angles. These activities align with NCCA Primary Energy and Forces standards, fostering observation and prediction skills essential for scientific inquiry.

Students connect pushes and pulls to everyday experiences, like swinging on playground equipment or kicking a ball, which helps them recognize forces as invisible interactions between objects. By predicting motion changes before testing, they practice evidence-based reasoning and refine their mental models of force and motion. This topic lays groundwork for understanding balanced and unbalanced forces in later years.

Active learning shines here because forces are abstract and invisible, yet their effects are immediate and observable. Hands-on experiments with familiar objects allow students to test predictions safely, discuss discrepancies in small groups, and build confidence in scientific thinking through trial and error.

Key Questions

1. Analyze how the strength of a push or pull affects an object's motion.
2. Compare the effects of different forces on the same object.
3. Predict how an object's motion will change if a force is applied in a new direction.

Learning Objectives

• Analyze how the strength of a push or pull affects an object's speed and direction of motion.
• Compare the effects of applying different forces to the same object.
• Predict how an object's motion will change when a force is applied in a new direction.
• Explain how pushes and pulls cause changes in an object's motion, including starting, stopping, and changing direction.

Before You Start

Observing and Describing Objects

Why: Students need to be able to observe and describe the properties of objects before they can analyze how forces affect them.

Identifying Changes in Objects

Why: Understanding that objects can change (e.g., shape, position) is foundational to recognizing how forces cause these changes.

Key Vocabulary

Force	A push or a pull that can make an object move, stop moving, speed up, slow down, or change direction.
Push	A force that moves an object away from the source of the force.
Pull	A force that moves an object toward the source of the force.
Motion	The process of moving or changing position.
Direction	The path along which someone or something moves or develops.

Watch Out for These Misconceptions

Common Misconception

Objects stop moving on their own without any force.

What to Teach Instead

Motion stops due to opposing forces like friction or air resistance, not because objects 'want' to rest. Demonstrations with rolling balls on rough versus smooth surfaces reveal these hidden forces. Group discussions after trials help students articulate how balanced forces lead to no net change.

Common Misconception

Pulling is not a real force, only pushing moves things.

What to Teach Instead

Pulls are forces just like pushes, acting in the opposite direction. String-pulling activities show identical effects on speed and direction. Peer predictions and comparisons during pair tests correct this by highlighting symmetry in force actions.

Common Misconception

Heavier objects always move faster with the same push.

What to Teach Instead

Mass resists changes in motion, so heavier objects accelerate slower. Ramp races with varied weights let students measure and graph results. Collaborative analysis shifts focus from size to force-mass balance.

Active Learning Ideas

Stations Rotation: Push Strength Stations

Prepare stations with toy cars and ramps at three inclines. Students push cars with light, medium, and strong forces, measure distances traveled with rulers, and record in notebooks. Groups rotate stations, then share data to identify patterns in motion changes.

45 min·Small Groups

Pairs Challenge: Direction Changes

Pairs use string-attached blocks on tables. One student pulls in straight, angled, or circular paths while the other times speed changes with stopwatches. They predict and test how direction shifts affect path, drawing results on worksheets.

30 min·Pairs

Whole Class: Prediction Relay

Line up students with balls. Teacher calls force types (push up, pull back); students predict and demonstrate on a marked floor grid. Class votes on predictions before tests, discussing matches or surprises as a group.

35 min·Whole Class

Individual: Ramp Designer

Each student builds a ramp from books and cardboard, tests marble pushes/pulls with string, and adjusts angles to change speed or direction. They journal predictions, observations, and one key learning.

25 min·Individual

Real-World Connections

• Engineers designing playground equipment, like swings and slides, must understand how pushes and pulls affect motion to ensure safety and fun. They calculate the force needed to propel a child down a slide or keep a swing moving smoothly.
• Mechanics at a car repair shop use their knowledge of forces to diagnose and fix issues. They understand how pushing on the brake pedal (a pull on the brake fluid) stops the car, or how pushing the accelerator makes it go faster.

Assessment Ideas

Exit Ticket

Give each student a small toy car and a ramp. Ask them to write down: 1. How they used a push to make the car move. 2. How they used a pull to stop the car. 3. What would happen if they pushed the car harder.

Discussion Prompt

Present students with a scenario: 'Imagine you are trying to move a heavy box across the floor. What are different ways you could use pushes and pulls to move it? How would the strength of your push or pull affect how quickly the box moves?' Facilitate a brief class discussion.

Quick Check

Show students a video clip of someone kicking a soccer ball. Ask them to identify: 1. The force applied (push or pull). 2. How the force changed the ball's motion (started it, changed direction, etc.). 3. What would happen if the ball was kicked with more force.

Frequently Asked Questions

What everyday examples illustrate pushes and pulls for third years?

Playground swings show pulls changing direction and speed, while kicking footballs demonstrates pushes starting motion. Classroom toy cars pushed across desks reveal stopping due to friction. These relatable contexts, combined with simple measurements, help students link abstract forces to real-world actions and build predictive skills over multiple lessons.

How can active learning help students grasp pushes and pulls?

Active approaches like station rotations and prediction relays make invisible forces visible through direct manipulation and measurement. Students test hypotheses with toy cars or balls, observe effects, and refine ideas in group talks. This trial-based method counters misconceptions, boosts engagement, and develops evidence-driven reasoning more effectively than lectures alone.

How do you assess understanding of force strength effects?

Use prediction journals where students forecast motion changes before experiments, then compare with data tables of distances or times. Rubrics score accuracy of predictions, observation details, and group explanations. Extension tasks like designing obstacle courses evaluate application of force concepts to new scenarios.

What materials work best for pushes and pulls investigations?

Gather low-cost items like toy cars, balls, string, rulers, stopwatches, ramps from cardboard, and varied surface mats for friction tests. These allow safe, repeatable trials across abilities. Pre-testing ensures smooth flow, and student-led material choices foster ownership in the inquiry process.