Make conclusions based on the results. Given the magnitude and direction of two of the forces acting on the test object, predict the magnitude and direction of a third force needed to maintain static equilibrium. Test the prediction experimentally. Account for any slight deviations from predicted values. A similar set of experiments can be performed on a non-concurrent force apparatus.
Students can work in groups of three or four at different stations in the room.
Each group gets an empty cardboard egg carton and some spheres having different masses and sizes. Number the slots in the egg carton from 1 to 6, with the largest numbers in the centre of the carton. The positions of the cartons can be adjusted back and forth, in the line along the floor where the balls will strike. Depending on the size and mass of the balls being used, students will have to determine where on the ramp the balls should be placed in order for them to land in the holes scoring the highest point values. Teams can compete against one another, placing the cardboard carton in different positions and giving the other team a particular ball to use.