The drop time can be calculated as follows: where y is the vertical height of the table and g is the acceleration due to gravity. How did the calculated drop time compare to the average of your measured drop times? Find the percent error using the following equation: What factors might cause the differences?

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive