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  2. Building a 40-Meter Mousetrap Car: Tips for Optimal String...

    www.physicsforums.com/threads/building-a-40-meter-mousetrap-car-tips-for...

    The string should be attached to the back of the car to ensure forward movement. To keep the string attached during the run, it should be securely tied or wrapped around the car's axle. Other tips for optimal string attachment include using a lightweight and sturdy attachment point and finding the right tension for the string. Mar 15, 2006.

  3. What are the most dense everyday items? eg. sinker for fishing,...

    www.physicsforums.com/threads/what-are-the-most-dense-everyday-items-eg-sinker...

    The most dense material used in everyday items is osmium, which has a density of 22.59 grams per cubic centimeter. However, osmium is not commonly used in everyday items due to its rarity and high cost. Iron and steel, with densities of 7.8 grams per cubic centimeter, are more commonly used in everyday items.

  4. What is the world's lowest vacuum pressure achieved? - Physics...

    www.physicsforums.com/threads/what-is-the-worlds-lowest-vacuum-pressure...

    The current record for the best vacuum ever achieved is a vacuum density of 10^-18 torr, which was achieved by researchers at the University of Tokyo in 2019. This is equivalent to a pressure of 10^-15 atmospheres, which is about one trillionth of the pressure found in the Earth's atmosphere. 2.

  5. Race car suspension Class - Physics Forums

    www.physicsforums.com/threads/race-car-suspension-class.326355

    Car Class Race Suspension. In summary,-The stock car suspension is important for understanding the complexity of a Formula Cars suspension.-When designing a (front) suspension, geometry layout is critical.-spindle choice and dimensions, kingpin and steering inclination, wheel offset, frame height, car track width, camber change curve, static ...

  6. Learn About the Speed of Light and Galilean Relativity - Physics...

    www.physicsforums.com/insights/speed-light-galilean-relativity

    Hippolyte Fizeau was the first to accurately measure the speed of light with his cogwheel and water experiments. The Fizeau water experiment showed that light velocity is not additive with the velocity of its source, as predicted by Galilean relativity. The de Sitter double star experiment proposed that if the speed of light were additive with ...

  7. Quadratic equation help (Time when one vehicle passes another)

    www.physicsforums.com/threads/quadratic-equation-help-time-when-one-vehicle...

    Quadratic equation help (Time when one vehicle passes another) In summary: The question states: " [the motorcycle] reaches its greatest speed vm =58.8 m/s before the car reaches its greatest speed vc =106 m/s."vc > vm, so the car will eventually reach the motorcycle whether or not it has reached maximum speed.Thanks for that insight.

  8. Why does the front end of the car lift up when accelerating...

    www.physicsforums.com/threads/why-does-the-front-end-of-the-car-lift-up-when...

    Accelerating Car Lift. In summary, the front end of the car lifts forward when accelerating due to a torque caused by the forward force on the four wheels at the bottom of the car. This torque is also affected by weight distribution, suspension springs, and the engine's torque on the rear wheels. The car's center of gravity and wheelbase also ...

  9. The effect of mass on roller coaster cars - Physics Forums

    www.physicsforums.com/threads/the-effect-of-mass-on-roller-coaster-cars.15894

    A heavier car may put more strain on the track and support structures, making them more prone to wear and tear. This can potentially lead to accidents if the car's mass is not properly accounted for in the design and maintenance of the roller coaster. Additionally, a heavier car may also put more stress on riders, causing discomfort or injury. 4.

  10. Forces applied on the bolts in the bike's hinge | Page 2 -...

    www.physicsforums.com/threads/forces-applied-on-the-bolts-in-the-bikes-hinge...

    Forces applied on the bolts in the bike's hinge. kielbasa said: I took a shortcut. 1080MPa x 50,25mm2 = 54250 N --> (roughly equals to a mass of 5400kg) Your "shortcut" took you down a blind alley. A Force doesn't ever 'equal' a mass.

  11. Linear gimbal system - Physics Forums

    www.physicsforums.com/threads/linear-gimbal-system.1066528

    Linear gimbal system. Hello everyone, I need some advice. I have a rifle and need to install an optical system on it. It can't be installed in the forehead because of the large recoil and shaking during the shot. I had an idea to develop a stabilizing platform. First, we want to overcome the longitudinal recoil.