Science · Grade 10

Active learning ideas

Free Fall and Projectile Motion

Active learning helps students confront misconceptions directly while building intuition for how forces and motion interact. When students measure, predict, and analyze real motion, they move beyond abstract formulas to see physics in action. This hands-on approach clarifies why free fall and projectile motion follow predictable patterns regardless of mass or angle.

• Ontario Curriculum Expectations
• HS-PS2-1

• 25–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Problem-Based Learning
• 35 min · Pairs

Pairs Lab: Free Fall Measurements

Partners drop coffee filters, balls, and keys from set heights using meter sticks. Time falls with smartphones or stopwatches, recording five trials per object. Calculate average acceleration g and graph distance versus time squared.

Explain how gravity uniformly accelerates objects in free fall.

Facilitation Tip

During the Pairs Lab, circulate to ensure students align the timing gate precisely with the ball’s release point to avoid timing errors.

What to look for

Present students with a scenario: 'A ball is dropped from a height of 20 meters. Ignoring air resistance, what is its velocity just before it hits the ground?' Ask students to show their calculations using the appropriate kinematic equation and hold up their answers.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 02

• Problem-Based Learning
• 45 min · Small Groups

Small Groups: Ramp Projectile Launcher

Groups release marbles from adjustable ramps onto flat tables, measuring horizontal range and vertical drop. Vary launch heights and angles, tabulate data, and plot range versus angle. Predict maximum range location.

Analyze the independent components of horizontal and vertical motion in projectiles.

Facilitation Tip

For the Ramp Projectile Launcher, remind groups to measure both launch height and horizontal distance from the same reference point to maintain consistency.

What to look for

Give each student a card with a diagram of a projectile's parabolic path. Ask them to draw and label vectors representing the horizontal velocity, vertical velocity, and acceleration at three different points on the path (launch, peak, landing). They should also write one sentence explaining why the horizontal velocity remains constant.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 03

• Problem-Based Learning
• 30 min · Whole Class

Whole Class: Video Motion Analysis

Project a slow-motion video of a thrown ball. Class pauses to mark positions frame-by-frame on whiteboard. Separate horizontal and vertical motions on graphs, verifying constant horizontal velocity.

Predict the trajectory and landing point of a projectile given initial conditions.

Facilitation Tip

When using Video Motion Analysis, set the frame rate to 30 fps or higher to capture smooth motion for accurate position-time graphs.

What to look for

Pose the question: 'Imagine two identical balls are launched horizontally from the same height at the same time. One is launched with a high horizontal speed, and the other with a low horizontal speed. Which ball hits the ground first? Explain your reasoning using the concepts of independent motion components.'

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 04

• Problem-Based Learning
• 25 min · Individual

Individual: Trajectory Prediction Sheets

Students receive scenarios with initial speeds and angles. Sketch trajectories, calculate landing points using components. Share and verify with class launcher demo.

Explain how gravity uniformly accelerates objects in free fall.

Facilitation Tip

Before the Trajectory Prediction Sheets, review the independence of motion components with a quick whole-class example of a dropped vs. thrown ball.

What to look for

Present students with a scenario: 'A ball is dropped from a height of 20 meters. Ignoring air resistance, what is its velocity just before it hits the ground?' Ask students to show their calculations using the appropriate kinematic equation and hold up their answers.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

A few notes on teaching this unit

Teach this topic by first establishing free fall as the foundation, then layering on projectile motion as two independent motions. Avoid starting with complex equations; instead, let students derive the relationships through measurement and observation. Emphasize the role of air resistance only after they grasp ideal conditions, as it often obscures the underlying principles.

Successful learning looks like students confidently using kinematic equations to predict outcomes, explaining why horizontal and vertical motions are independent, and recognizing symmetry in projectile paths. They should articulate the role of gravity in free fall and describe how launch angle affects range without mixing up the components.

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Watch Out for These Misconceptions

• During Pairs Lab: Free Fall Measurements, watch for students assuming heavier objects hit the ground first when comparing feather and ball drops.

  Guide students to crumple the feather into a tight ball and drop both objects simultaneously from the same height. Have them record times and graph the results side-by-side to observe identical fall times, reinforcing that mass does not affect acceleration in free fall.

• During Small Groups: Ramp Projectile Launcher, watch for students expecting the ball’s horizontal speed to decrease as it moves forward.

  Ask groups to mark equal time intervals along the table with tape, then measure the horizontal distance traveled in each interval. They should note the constant spacing, which demonstrates steady horizontal velocity. Ask them to explain what force would be needed to change that speed.

• During Small Groups: Ramp Projectile Launcher, watch for students believing 30-degree and 60-degree launches produce different rise and fall times.

  Have groups launch balls at both angles and use stopwatches to record the time from launch to peak and peak to landing. Direct them to compare the two times and discuss how the vertical motion’s symmetry creates equal durations regardless of angle.

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Methods used in this brief

• Problem-Based Learning