Deardorff Office hours: Wednesdays after class in the Physics Tutorial Phillips Hall Instructor contact information Duane L. Deardorff CourseĬlass times and location Class meets: MWF 10:00 to 10:50 AM in 247 A little physics lesson and the secret to what makes our patent-pending Inertia Motors the secret sauce of one of the most adaptable pieces of film equipment on the market.Physics 101 Syllabus The University of North Carolina at Chapel Hill Physics 101, Spring 2008 The wheels behave exactly like a heavy set of wheels. #PHYSICS 101 SOFTWARE#We took the actual laws of inertia and put them into the software that drives the motors. As you spin the wheel up to speed, the motors will resist the increase in speed, but then once the wheel is at speed, they assist the wheel's continuous spin.Īnd this was no arbitrary software algorithm. What does it feel like? Well, exactly what a heavy wheel feels like. Unlike a brake pad that can only resist motion by pulling, the Inertia Motors can resist and assist motion by pushing. And also the secret to the Inertia Wheels. Most wheels can replicate this part easily enough.īut an object in motion wants to stay in motion. Drag is always trying to bring the object to rest. It's relatively easy to make an object at rest stay at rest using drag. There are two parts to it, an object at rest and an object in motion. This is the law that explains why heavy objects with more mass are smoother. In order to break down how the Inertia Wheels appear to defy physics, let's talk about Newton's first law (also called the "Law of Inertia"). we added motors, a dedicated processor, ultra-high-resolution encoders, and a lot of math.Īn object at rest wants to stay at rest, and an object in motion wants to stay in motion. How did we create mass without replacing the wheels? Simple. The smoothness in the Inertia Wheels does not come predominantly from the weight of the wheel. That's because the smoothness of the wheel comes from the actual weight of the wheel. With historical wheels, you couldn't adjust the mass of the wheel unless you replaced the wheel itself. Heavier is smoother because it can easily overpower every little force trying to change its velocity. Alexa Studio handheld versus a DSLR handheld. Chiefly, they are inherently smoother in motion. Heavier things have lots of benefits on film sets. If you've ever tried to bring a fully loaded Fisher 10 to a rapid stop, you know that a heavy object isn't just difficult to start moving. Separately, Mass is an object's own weight, and the more mass an object has, the more effort is required to change the object's velocity. In physics terms, drag is an external force that tries to bring the wheel to a rest. No drag feels like the wheel wants to keep spinning, and you can either use more forward force to speed it up, more backward force to slow it down, or neutral force, and the wheel will keep going. More drag feels like you continuously need to apply forward force to keep it moving because the break is continuously trying to bring the wheels to a stop. It's usually applied with some sort of padded breaking system with one singular dimension of adjustment from no drag to more drag. Historically, operators have only been able to change the drag on wheels.
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