Investigating Air Resistance

Investigation of air resistance We are trying to investigate the influence of air resistance on the speed with which the trolley moves downward relative to the area of ​​the sail connected to the trolley. In my expectation, the larger the sail area, the lower the trolley will be, that is, it will be late. The variable I am about to change is the height of the sails and therefore the area of ​​the sails. Although some variables can not be changed, it is possible that experiment results may be affected, so it is necessary to be careful.

Plan: In this survey, they can not calculate air resistance and friction, so they are ignored. The acceleration caused by gravity and the way the study is carried out are control variables. The height at which the ball falls is an independent variable, the variable to change, and the dependent variable is the time it takes for the ball to reach the ground. Chart: On the next page, the result recorded in the above table is displayed as a line chart. This makes it easy to identify the trend of the result. It is also a good way to record information, which is useful for quick reference; if you want to drop time from a ball other than the height specified in the table you can get a value from the graph.

When the ball moves through the air, air resists the movement of the ball, and the resistance is called resistance. Drag along the flight direction to the opposite side of the flight direction. In general, there are many factors that influence the size of resistors, such as the shape and size of the object, the square of the speed of the object, the condition of the air, especially the density and viscosity of air. Determining the magnitude of resistance is difficult as it depends on the details of how the flow interacts with the surface of the object. This is particularly difficult for football, as stitches are used to hold the ball together. So the surface of the ball is not smooth. In the recent World Cup 2010, grooves were added to the surface of the ball to make the surface more uniform. To determine the amount of drag, aerodynamics often use the wind tunnel to measure the resistance on the model.