Activity 01
Lab Demo: Cart Collisions
Set up dynamics carts on a track with motion sensors. Students collide carts with soft versus hard bumpers, measure velocity changes using timers, and calculate impulse from force probes. Groups compare Δp across trials to verify the theorem.
Explain how impulse is related to the change in an object's momentum.
Facilitation TipDuring the Cart Collisions lab, set up two carts with force sensors and varying bumper materials so students can directly compare force-time graphs for different Δt values.
What to look forPresent students with a scenario: A 1000 kg car travels at 20 m/s. It brakes to a stop in 5 seconds. Calculate the impulse experienced by the car and the average braking force. Ask students to show their work and identify the units for each calculated value.
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Activity 02
Design Challenge: Egg Drop Protectors
Provide eggs and materials like straws, foam, and tape. Students design devices to extend impact time during a 2-meter drop, measure landing force with a bathroom scale, and analyze how crumple zones reduce average force. Present findings to class.
Analyze how crumple zones in cars reduce injury by extending the time of impact.
Facilitation TipFor the Egg Drop Protectors challenge, provide a strict materials list and time limit to push students to iterate quickly and prioritize impulse-spreading strategies.
What to look forPose the question: 'Why does a gymnast try to land with bent knees after a high jump?' Guide students to discuss how bending their knees increases the time of impact, thereby reducing the average force exerted on their bodies, using the impulse-momentum theorem in their explanation.
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Activity 03
Stations Rotation: Impulse Scenarios
Create stations for jumping rope (measure Δp from velocity change), swinging pendulums into clay, fan carts with barriers, and balloon rockets. Students rotate, record data, and compute impulses. Debrief with whole-class predictions.
Predict the final velocity of an object after a known impulse is applied.
Facilitation TipIn Station Rotation: Impulse Scenarios, assign groups to specific stations first, then rotate roles (recorder, measurer, presenter) to ensure all students engage with the calculations.
What to look forOn a small card, ask students to write the formula for momentum and the formula for impulse. Then, have them explain in one sentence how these two concepts are related according to the impulse-momentum theorem.
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Activity 04
Simulation Pair Work: PhET Collisions
Use the PhET Collision Lab simulation. Pairs adjust masses, velocities, and elasticity, predict post-collision speeds, then apply impulses manually. Discuss how time of interaction affects outcomes.
Explain how impulse is related to the change in an object's momentum.
Facilitation TipWith PhET Collisions simulations, have pairs focus on one variable at a time (e.g., mass, elasticity) while holding others constant to isolate the impulse-momentum relationship.
What to look forPresent students with a scenario: A 1000 kg car travels at 20 m/s. It brakes to a stop in 5 seconds. Calculate the impulse experienced by the car and the average braking force. Ask students to show their work and identify the units for each calculated value.
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Generate Complete Lesson→A few notes on teaching this unit
Treat this topic as a progression from concrete to abstract. Start with collisions students can see and feel, then use simulations to generalize patterns. Avoid jumping straight to formula memorization. Research shows that students master impulse-momentum more deeply when they connect the math to physical experiences, especially when they design solutions to real problems like protecting eggs or understanding car safety. Model clear sign conventions and unit tracking from the first lab to prevent persistent errors.
By the end of these activities, students should confidently apply the impulse-momentum theorem to predict outcomes in collisions, explain why direction matters in momentum calculations, and justify design choices using data. They should also articulate how impulse and momentum relate through clear explanations and correct unit usage in calculations.
Watch Out for These Misconceptions
During Cart Collisions, watch for students who assume impulse depends only on the force sensor’s peak value rather than the area under the force-time graph.
Have students calculate impulse both by integrating the force-time graph and using Δp = mΔv, then compare the two methods to demonstrate that impulse is the total change in momentum, not just the highest force.
During Egg Drop Protectors, watch for students who ignore direction when calculating momentum changes from angled landings.
Require students to draw vector diagrams of velocity changes and decompose components, then recalculate Δp using only the relevant direction before comparing their protector’s effectiveness.
During the Design Challenge: Egg Drop Protectors, watch for students who believe crumple zones increase total impulse in a crash.
Use force sensors to show that impulse remains constant (Δp is fixed by the egg’s fall and landing speed) while peak force drops as contact time increases, making the relationship visible in real-time data.
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