The utility model discloses a device for verifying a
centripetal force expression in motion of a
conical pendulum by adopting an
electric spark timer, a hand-cranking lifting device is placed at the lower center position of a support, a long-shaft low-speed motor is fixed in the middle of the support, and the
electric spark timer and a
motor power supply box are respectively fixed on the left side and the right side of the support; an
optical disc is fixed on a rotating shaft of the long-shaft low-speed motor, a layer of
tin foil paper is adhered on the
optical disc, and two
graphite lines are suspended at two centrosymmetric positions of the
optical disc; two small insulating balls are hung at the lowest ends of the two
graphite wires; the electric
brush is fixed on the inner side of the support right above the optical disc, the upper end of the electric
brush is a
metal spring end, the lower end of the electric
brush is a
graphite end, and the graphite end is conductive with
tin foil paper on the rotating optical disc in the continuous
contact friction process. The device can accurately and quantitatively verify the
centripetal force expression, makes up the gap that the
centripetal force expression cannot be quantitatively obtained through student experiment exploration in high school
physics teaching, and has a stronger enlightenment effect on innovative thinking of students.