Lab 131

# Lab 131 - Lab 131 Centripetal Force Mario DeLaPaz Kui Chen...

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Lab 131 – Centripetal Force Mario DeLaPaz Kui Chen Phys 111A Objective : To understand that there is centripetal force acting on an object in circular motion and the acceleration is always directed radially inward. Theoretical background : 1. U=mgh 2. K = ½ mv 2 3. W=Fd 4. W= U 5. F= m(g+v 2 /r) Tension force at the lowest point 6. The velocity vector tangent to the circle is always perpendicular to the circle radius. Newton’s law for x and y components are : in x direction, Tsin( Ɵ )=ma x ; in y direction : -mg+tcos( Ɵ ). The lowest point a y is just the radial acceleration v 2 / r . Solving for T gives you the fifth equation. Tension T and weight mg are the only two forces visible in FBD. Mg is conservative but T is not.Aby work done by tension would change the energy of pendulum. Tension is perpendicular to velocity and Work done by the Tension force is zero. 7. Equipment List : 8. PC with ULI ; Force Probe ; Clamp to hold force probe ; Pendulum with different masses 9. Procedure :

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Lab 131 - Lab 131 Centripetal Force Mario DeLaPaz Kui Chen...

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