Question

Please help with question 2.

Physics I Pre-Lab Assignment: Rotational Kinetic Energy On a blank piece of paper (lined or computer, nothing torn out of a notebook), please answer the questions below. The assignment is due before lab starts. 1. When an object rolls down an incline, its kinetic energy is composed of both rotational and translational terms. Write out the equation for total kinetic energy with rotational and translational components. Label the terms to identify which is rotational and which is translational. 2. A uniform ball of mass 7 kg and radius R rolls smoothly from rest down a ramp at angle 8 = 30°. If the ball descends a vertical height of 1.2 m, what is its speed at the bottom? 3. Review the lab instructions for this week, and write a brief introduction to the lab. Your introduction should include: • A few sentences about what we'll be measuring this week. • A few sentences about how we'll be making those measurements.

Answer 1

mv Rotational Kinetc energy ERIw Trans dational kMehc ener E bady Chore I the hertia Moment augular velocty verng Total knedic E 7kaRadus = R Vertial heiglt desconded h 12 m Tot avitanal potendial enerTT at he top is egual to to tal knetic evers he bottom M = at muit myh 17 2 m mmgh 2- 1 7

mv Rotational Kinetc energy ERIw Trans dational kMehc ener E bady Chore I the hertia Moment augular velocty verng Total knedic E 7kaRadus = R Vertial heiglt desconded h 12 m Tot avitanal potendial enerTT at he top is egual to to tal knetic evers he bottom M = at muit myh 17 2 m mmgh 2- 1 7