Ninth Grade, Physics Projects, Lessons, Activities (Page 6)

How Does Your Eardrum Work?

Science Fair Project Idea

Scientific Method

Eardrums are membranes inside your ears that vibrate when sound waves hit them. These vibrations are converted into electrical signals and sent to your brain, which allows you to hear sound. The frequency response of your eardrum, or the range of frequencies that will cause it to vibrate, determines your hearing range. Typical human hearing ranges from about 20 Hz up to 20,000 Hz, although the ability to hear high frequencies typically degrades as you get older. Some other animals can… Read more

How Long Will My Sleepy Yo-yo Sleep?

Science Fair Project Idea

Scientific Method

Sometimes, simple toys can be quite complicated. Take the yo-yo. It's a fun toy and there is nothing simpler than a string wrapped between two connected disks. But there's a lot of physics that makes a yo-yo work. In this science fair project, learn more about how and why a yo-yo works. You will investigate the effect of string length on the yo-yo's "sleep" trick time. If people ask why you've got a yo-yo with you all the time, tell them that while it looks like you're just having fun, you're… Read more

Rocket Catcher Challenge for Grades 9-12

Lesson Plan Grade: 9th-12th

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In this fun engineering lesson plan, your students will build a rocket-catching device to help a falling rocket land vertically without crashing, using simple and readily-available materials. Elementary and middle school versions of this lesson plan are also available. This lesson was part of the 2025 Science Buddies Engineering Challenge. Read more

NGSS Performance Expectations:

High School - Science & Engineering Practices

Rubber Band Car Challenge for Grades 9-12

Lesson Plan Grade: 9th-12th

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In this fun engineering lesson plan, your students will build rubber band-powered cars using readily available craft supplies. The challenge is to build a car that goes as far as possible while making careful use of materials. Elementary school and middle school versions of this lesson plan are also available. This lesson was part of the 2024 Science Buddies Engineering Challenge. Read more

NGSS Performance Expectations:

High School - Science & Engineering Practices

Skiing and Friction: How Does Ski Wax Affect the Sliding Friction of Skis?

Science Fair Project Idea

Scientific Method

You can model this with an ice cube sliding down a plank: how high do you need to lift the end of the plank before the ice cube starts to slide? Try this with one side plain wood and the flip side waxed wood (use paraffin wax, candle wax or ski wax). Make sure both sides are equally smooth to start with. Do at least three trials. More advanced: using what you know about the forces acting on the ice cube, derive equations to calculate the coefficient of friction for each case. Variation: chill… Read more

Space Elevator Problem Set

STEM Activity

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Space elevators zipping people and materials up into space might seem like a very futuristic and improbable idea, but is it that difficult? This activity will guide you through the mathematics. Try it out and see what is possible with materials that can be produced with current technology. Read more

Water Striders & Surface Tension

Science Fair Project Idea

Scientific Method

Water striders (also called water bugs, pond skippers, etc.) are insects that can hop around on the surface of water (Figure 1). Unlike boats or other floating objects that are partially submerged and held up by the resulting buoyant force, water striders are held up by surface tension. Figure 1. Water striders (image credit Isaka Yoji). You can build your own water striders using thin wire (Figure 2 and summary video). Do some background research about… Read more

Air Pressure, It's in the Bag

Lesson Plan Grade: 6th-12th

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"Vacuum sealed" © 2010 Windell Oskay In this activity, students are asked to create a change in air pressure using a garbage bag and vacuum cleaner, then create an illustration, model or concept map that explains what is happening. This activity is part of the KQED Engineering Is: Bringing Fish Up from the Deep e-book. The e-book explores the science and engineering principles behind the California Academy of Sciences' portable… Read more

Bouncing Balls: Collisions, Momentum & Math (for High School)

Lesson Plan Grade: 9th-12th

In this activity, students examine how different balls react when colliding with different surfaces. Also, they will have plenty of opportunity to learn how to calculate momentum and understand the principle of conservation of momentum.Engineering Connection Sports engineering is becoming a popular specialty field of study. While some engineers dedicate their research to understanding collisions between balls and bats, others study the effects of a golf ball colliding with the head of a golf… Read more

NGSS Performance Expectations:

HS-PS2-2. Use mathematical representations to support the claim that the total momentum of a system of objects is conserved when there is no net force on the system.

Cricket Wicket Knockdown Challenge for Grades 9-12

Lesson Plan Grade: 9th-12th

Teach your students about the engineering design process with this fun lesson plan. They will design and build a ball-launching machine to knock down a target. Optionally, they can enter their designs in the 2020 Engineering Challenge for a chance to win a cash prize for your school! Teachers, note that elementary school and middle school versions of this lesson plan are also available. Read more

NGSS Performance Expectations:

High School - Science & Engineering Practices

Ninth Grade, Physics Projects, Lessons, Activities (68 results)

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