PHYS 111 Laboratory - Pre-lab #8 (TORQUE AND STATIC EQUILIBRIUM) Student Name: Alex Moore Lab Day and Time: Friday @ 10:30 Due at the beginning of lab. All answers must be legibly handwritten for credit. Show all work. References: lab manual, textbook Ch. 7.3, 7.4, 8.1, Ex. 7.13, Ex. 8.1 to 8.3, and Prob. Solv. Approach 8.1. 1) (lab manual, 7.3, Eq. 7.9) Write an equation for the magnitude of torque when a force is applied perpendicular to a surface away from the pivot point. What is the lever arm in this case? Explain when the torque is positive and negative. Identify all variables and SI units. Tarty 2) (lab manual, Ch. 8.1, Exs. 8.1 to 8.3, Prob. Solv. Approach 8.1) A fulcrum is placed at the 0.50 m mark (the center of gravity) of a meter stick. A mass of 0.10 kg is suspended at the 0.30 m mark of the meter stick. Calculate the position where a 0.20 kg suspended mass will balance the stick. Be sure to write the sum of torques equation with correct signs. 3) (lab manual, Ch. 8.1, Exs. 8.1 to 8.3, Prob. Solv. Approach 8.1) A fulcrum is placed at the 0.50 m mark (the center of gravity) of the meter stick. Two separate 0.10 kg are suspended at the 0.30 m and 0.40 m marks. Calculate the mass of a suspended object at the 0.90 m mark that will balance the stick. Be sure to write the sum of torques equation with correct signs. 4) (lab manual, Ch. 8.1 and 8.2, Exs. 8.1 to 8.3, Prob. Solv. Approach 8.1) A fulcrum is placed at the 0.10 mark of a meter stick. The mass of the meter stick produces nonzero torque about the pivot point. Assume the entire mass of the meter stick is located at its center of mass (the 0.50 m mark) to account for this torque. Calculate the suspended object mass at the 0.05 m mark that balances the stick. Be sure to write the sum of torques equation with correct signs. PHYS 111 Laboratory - Fall 2020