[理学]chapter-1大学物理
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完整版)大学物理笔记Chapter 1: Proton Kinematics1.Reference frame: A standard object chosen to describe the n of an object.2.Coordinate system3.Particle: Under certain ns。
the n of an object can be represented by the n of any point on the object。
which can be treated as a point with mass。
This point is called a particle (ideal model).4.n vector (displacement vector): A vector pointing from the origin of the coordinate system to the n of the particle.5.Displacement: The increment of the n vector in the timeint erval Δt.6.Velocity: Speed of n.7.XXX: The average rate of change of velocity.8.XXX quantities.9.ns of n.10.Principle of n of n.n vector: r = r(t) = x(t)i + y(t)j + z(t)k Displacement: Δr = r(t+Δt) - r(t) = Δxi + Δyj + Δzk In general。
Δr ≠ ΔrVelo city: v = lim Δr/Δt = i(dx/dt) + j(dy/dt) + k(dz/dt) XXX: a = lim dv/dtCircular nj + k = xi + yj + zkXXX: ω = dθ/dtXXX: α = dω/dtXXX: a = an + atNormal n: an = v^2/R pointing towards the center of the circleXXX: at = Rα along the XXXLinear velocity: v = RωArc length: s = RθChapter 2: XXX1.XXX:XXX's First Law: An object at rest will remain at rest。