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- https://phys.libretexts.org/Bookshelves/Relativity/Supplemental_Modules_(Relativity)
- https://phys.libretexts.org/Bookshelves/College_Physics/Spiral_Physics_-_Algebra_Based_(DAlessandris)/Spiral_Mechanics_(Algebra-Based)/Model_1%3A_1D_Constant-Force_Particle_Model/02._Model_SpecificsThus, if we are studying the motion of a car we will assume that the road is perfectly smooth with no bumps, the road is perfectly straight with no curves, and the driver is perfectly steady at the wh...Thus, if we are studying the motion of a car we will assume that the road is perfectly smooth with no bumps, the road is perfectly straight with no curves, and the driver is perfectly steady at the wheel with no swaying to the right or left. For example, when a basketball bounces off the ground the force of the ground on the basketball is: The dark line represents the actual force between the ground and the ball, the dashed line represents how we will approximate the force in our current model.
- https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Supplemental_Modules_(Electricity_and_Magnetism)/FieldsImagine, for the sake of argument, that they can do this so quickly that each magnet is reversed while the force signal from the other is still in transit. (For a more realistic example, we'd have to ...Imagine, for the sake of argument, that they can do this so quickly that each magnet is reversed while the force signal from the other is still in transit. (For a more realistic example, we'd have to have two radio antennas, not two magnets, but the magnets are easier to visualize.) During the flipping, each magnet is still feeling the forces arising from the way the other magnet used to be oriented.
- https://phys.libretexts.org/Bookshelves/Electricity_and_Magnetism/Supplemental_Modules_(Electricity_and_Magnetism)/ElectricityBut Newton realized that if science was to describe all of nature in a unified way, it was not enough to unite the human scale with the scale of the universe: he would not be satisfied until he fit th...But Newton realized that if science was to describe all of nature in a unified way, it was not enough to unite the human scale with the scale of the universe: he would not be satisfied until he fit the microscopic universe into the picture as well. If the atom happens to be a hydrogen atom, then the muon takes up an orbit that is on the average 206.77 times closer to the proton than the orbit of the ejected electron.
- https://phys.libretexts.org/Bookshelves/College_Physics/Spiral_Physics_-_Algebra_Based_(DAlessandris)/Spiral_Mechanics_(Algebra-Based)/Model_1%3A_1D_Constant-Force_Particle_Model/03._Kinematics/01._Concepts_and_Principleswhere Δr represents the change in position and Δt the corresponding change in time. (Actually, this is the average velocity of the object over the time interval \(\Delta \! t...where Δr represents the change in position and Δt the corresponding change in time. (Actually, this is the average velocity of the object over the time interval Δt, but as the time interval becomes smaller and smaller, the value of this expression becomes closer and closer to the actual rate at which the position is changing at one particular instant of time.)
- https://phys.libretexts.org/Bookshelves/College_Physics/Spiral_Physics_-_Algebra_Based_(DAlessandris)/Spiral_Mechanics_(Algebra-Based)/Model_1%3A_1D_Constant-Force_Particle_Model/03._Kinematics/02._Drawing_Motion_Diagrams_in_1DSince velocity is the change in position of the car during a corresponding time interval, and we are free to select the time interval as the time interval between exposures on our multiple-exposure ph...Since velocity is the change in position of the car during a corresponding time interval, and we are free to select the time interval as the time interval between exposures on our multiple-exposure photograph, the velocity is simply the change in the position of the car "between dots."
