7/8/2023 0 Comments Phet free online physics![]() ![]() After exploring this model, we recommend showing the historic file footage (see Video section below) of the Apollo 15 Hammer and Feather Drop. The model generates simultaneous position, velocity, and acceleration graphs for BOTH falling objects, plus side-by-side dot diagrams. Students can compare the motion of 2 free falling balls - one falling under the influence of gravity alone and the other experiencing air resistance. First, we recommend the Free Fall Air Resistance model linked above. We recommend two resources to introduce the idea of air resistance (which will be covered in more depth within Newton's Laws). In teaching free fall, it's good to be prepared for student confusion over why, for example, the free falling bowling ball hits the ground faster than the free falling leaf. Open Source Physics: Free Fall Air Resistance.With strong enough downward acceleration, the rider will experience negative g's (effective weightlessness). Time graph, which shows the apparent weight the rider feels. The authors have given this sim extra kick by including a G-force vs. time graph to customize the elevator ride. First, set the height and time, then watch the simulated motion. This EJS (Easy Java Simulation) model combines the acceleration of gravity with the acceleration of an elevator moving up or down. This model is especially helpful for visualizing the relationship between the one-dimensional motion of this example and its graph, as it displays the ball continuously bouncing at constant velocity in a straight line from floor to ceiling. ![]() Students can test their answers by setting the initial velocity on the simulation, then watch the ball's path. The student's task is to calculate an initial velocity so that the ball barely touches the 80-foot ceiling. ![]() This simulation by Wolfgang Christian shows a ball launched by a spring-gun in a building with a very high ceiling.
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