83.3 The acceleration in rectilinear motion The component of the acceleration: a2() dv (t) d'x(t) 3. How to detect and measure the instantaneous acceleration Accelerometer-a plum bob Direction of deviation of plum bob from vertical is opposite to the direction of the acceleration of the particle in the horizontal plane. 83.4 Rectilinear motion with a constant acceleration 83.4 Rectilinear motion with a constant acceleration 1. Some rules ignore the effects of air resistance @the origin of the coordinate could be chosen discretionarily Owrite the constant acceleration as a=a i @choose the initial time instant to be t,=0 ∠t Dlet x(t=x(0)=xo v (ti)=v(0)=vro6 2 2 d d ( ) d d ( ) ( ) t x t t v t a t x x = = The component of the acceleration: §3.3 The acceleration in rectilinear motion 3. How to detect and measure the instantaneous acceleration Accelerometer—a plum bob Direction of deviation of plum bob from vertical is opposite to the direction of the acceleration of the particle in the horizontal plane. a r θ a r θ §3.4 Rectilinear motion with a constant acceleration 1. Some rules §3.4 Rectilinear motion with a constant acceleration 1ignore the effects of air resistance 2the origin of the coordinate could be chosen discretionarily 3write the constant acceleration as 4choose the initial time instant to be a a ix ˆ = r ti = 0 t t t t ∆ = f − i = 5let 0 0 ( ) (0) ( ) (0) i x i x x x t = x = x v t = v = v