Teacher guide featuring 15 labs designed for Advanced Placement Physics 1.
Students use a force sensor and tension protractor to demonstrate that the sum of the forces acting on an object in static translational equilibrium is equal to zero, and the sum of the torques acting on an object in static rotational equilibrium is equal to zero.
What must the net force and net torque on an object be if the object is in static equilibrium (translational and rotational)? Experimentally demonstrate that the sum of the forces acting on an object in static translational equilibrium is equal to zero, and the sum of the torques acting on an object in static rotational equilibrium is equal to zero.
The Structured version of this lab activity is divided into two parts: Part 1 – Students suspend a 500-g mass from two lengths of thread and use two PASCO Tension Protractors to measure the tension and angle applied to the mass by each thread. Students then calculate the component forces acting on the mass as it hangs motionlessly, and sum each set of component forces. This process is repeated for two additional trials; each trial with a different thread length configuration. Student data for each trial will demonstrate that the sums of the component forces acting on the mass in static equilibrium are equal to zero (or nearly zero) for both the x- and y-directions. Part 2 – Students balance a meter stick on a fulcrum (directly under its center), and then place a 100-g mass at different distances from the fulcrum (pivot point) while applying a force, using a force sensor, to the meter stick on the opposite side of the pivot. When the applied force is enough to balance the meter stick and mass (static equilibrium), students record the force applied by the force sensor, the distance from the pivot to the force sensor, and the distance from the pivot to the mass. Students then calculate the torques applied to the meter stick by the mass and the force sensor and demonstrate that when the meter stick is in static equilibrium, the sum of the torques is zero, regardless of where the mass and force sensor are positioned.
AA-cell Battery or similar cylindrical object
This experiment may require software and an interface for data collection.