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Studio Session Physics: Drumsticks and a Slamming Door

Grade 8 physical science: read a drumstick force graph, name force pairs in a recording studio and pick a fix for a slamming door using criteria.

Grade 8ScienceInteractive · Printable

Aligned toMS-PS2-1

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What’s included

Single worksheet
Auto-graded online
1 NGSS standard
Printable answer key
10 questions
Classroom-ready

Details

Format: Interactive · Printable
Grade: Grade 8
Subject: Science
Question types: Fill in the blank, Multiple choice, Sorting, Short answer

About this worksheet

What students practice

Students read a force-time graph and use Newton's third law to describe the force on the other object.
Students name both objects and the direction in third-law force pairs.
Students use test data and criteria to choose and justify a solution to a collision problem.

How to use

Review Newton's third law first, then let pairs read the studio notes and the graph together. Discuss the trade-off in the last question as a class.

Curriculum

NGSS standard covered

MS-PS2-1

Use Newton's third law to explain what happens when two objects collide and design a solution for a collision problem.

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Studio Session Physics: Drumsticks and a Slamming Door

Use Newton's third law to explain a drum stroke and choose a fix for a door that slams.

The drum stroke

Read the studio notes and study the graph. Then answer the questions.

Studio Notes: Two Physics Puzzles

1The Riverbend Youth Recording Studio lets teens record music after school. Musicians play in the live room, and a sound engineer sits in the control room next door, where the microphone signals are recorded. Most sessions are for school bands, choirs and singer-songwriters, and every sound in the live room ends up on the recording, so even small noises matter. The two rooms are joined by a heavy sliding door with a thick glass window. Sound engineer Mr. Tavita Lindqvist-Obi runs the Thursday sessions with eighth graders Kalani Nwachukwu and Oren Szymanski, and this month he gave them two physics puzzles.

2The first puzzle came from the drum kit. When a drummer strikes the floor tom, the stick bounces back up, ready for the next stroke, while the 5 kg drum barely moves on its legs. The studio owns a practice drumhead with a thin force sensor under its center that records the force 1,000 times a second. During one soft stroke on the loosely tuned head, a 50 g stick came down, touched the head for a moment and bounced away. The graph shows how hard the stick pushed down on the head, starting from the moment it first touched.

3Mr. Lindqvist-Obi reminded the pair of Newton's third law: when two objects interact, each one pushes or pulls on the other with a force of the same size, in the opposite direction, at the same time.

4The second puzzle was the door. The soundproof door has a mass of 60 kg. When someone slides it shut quickly, at about 1.0 m/s, it slams into a steel stop on the door frame. The bang shows up on recordings as a thud, the screws that hold the frame keep working loose, and Mr. Lindqvist-Obi worries about the glass. The team fixed a force sensor to the stop and tested five options. Each time, a sliding rig pushed the door shut at 1.0 m/s, and each option was tested three times. The team measured the peak force on the frame, the loudness of the thud picked up by the microphones in the live room and whether the door still closed all the way, so no sound could leak around it. Mr. Lindqvist-Obi set four criteria for the fix, which are listed below the test results.