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  2. Fresnel number - Wikipedia

    en.wikipedia.org/wiki/Fresnel_number

    An equivalent definition is that the Fresnel number is the difference, expressed in half-wavelengths, between the slant distance from the observation point to the edge of the aperture and the orthogonal distance from the observation point to the center of the aperture.

  3. Kundt's tube - Wikipedia

    en.wikipedia.org/wiki/Kundt's_tube

    A modern version of Kundt's tube experiment, used in a South American university physics class. Instead of a transparent tube with powder in it to reveal the nodes, this uses microphones mounted in the tube. The piston (right center) is moved back and forth. When the microphone's position is at the nodes of the wave the sound pressure goes to zero

  4. Newton's laws of motion - Wikipedia

    en.wikipedia.org/wiki/Newton's_laws_of_motion

    Moreover, words which are synonymous in everyday speech are not so in physics: force is not the same as power or pressure, for example, and mass has a different meaning than weight. [11] [12]: 150 The physics concept of force makes quantitative the everyday idea of a push or a pull. Forces in Newtonian mechanics are often due to strings and ...

  5. Lever - Wikipedia

    en.wikipedia.org/wiki/Lever

    On the other hand, if the distance a from the fulcrum to the input force is less than the distance b from the fulcrum to the output force, then the lever reduces the input force. The use of velocity in the static analysis of a lever is an application of the principle of virtual work.

  6. Mechanical advantage - Wikipedia

    en.wikipedia.org/wiki/Mechanical_advantage

    The requirement for power input to an ideal mechanism to equal power output provides a simple way to compute mechanical advantage from the input-output speed ratio of the system. The power input to a gear train with a torque T A applied to the drive pulley which rotates at an angular velocity of ω A is P=T A ω A.

  7. Cost of transport - Wikipedia

    en.wikipedia.org/wiki/Cost_of_transport

    where is the energy input to the system, which has mass , that is used to move the system a distance , and is Standard gravity. Alternatively, one can use the power input to the system used to move the system at a constant velocity . The cost of transport is non-dimensional.

  8. Ford to cut European jobs as EV shift, Chinese rivals take toll

    www.aol.com/news/ford-cut-14-european-jobs...

    Ford said it would cut around 14% of its European workforce on Wednesday, blaming losses in recent years due to weak electric vehicle demand, poor government support for the EV shift and ...

  9. Torque - Wikipedia

    en.wikipedia.org/wiki/Torque

    For a rotating object, the linear distance covered at the circumference of rotation is the product of the radius with the angle covered. That is: linear distance = radius × angular distance. And by definition, linear distance = linear speed × time = radius × angular speed × time. By the definition of torque: torque = radius × force.