Test spin your mousetrap racers wheels in order to see how friction-free they spin. If you're allowed to, use the most powerful mousetrap possible. The length of the string connecting the lever on the trap to the axel will remain constant through out the duration of the experiment. In a mousetrap car, a string is attached to the lever arm of the mousetrap and the other end of the string is attached to the drive axle. Engineers try to design cars that make the most of this force when designing cars and other motor vehicles.
No need to introduce so many different notations and different forces. Anything long, light, and not too flexible will work for the lever. The vehicle must start from behind a start-line and then clear an obstacle as it travels the longest possible distance in the longitudinal direction from the start line. Also make sure that your mousetrap vehicle's bushings do not pinch on the axle, a small amount of play is a good thing to have in a bushing system. The lever arm which is attached to the mousetrap spring moves through a half circle which 180 degrees. The friction at a bearing point will depend on the materials you select for the axle and the bushing.
That means that large wheels have more rotational inertia than smaller wheels. A single front wheel was used throughout the experiment Tests were ran to determine how far the car would travel and how fast they traveled a distance of five and feet. This will form a buffer between your wheel and the chassis of your car, but can create friction if it comes in contact with your chassis. The more rotational inertia the wheels have, the more force will be required the change the state of rotation. Friction opposes your forward motion.
If we take friction to be the action between the car body's surface and the flowing air, this is a small part of the total resistance. Describe the results and talk about other designs in the class and how you could improve your design Extra credit will be awarded to the winner of the competition as described in the. Small wheels will require more revolutions to move the same distance while large wheels will require more torque to make them begin to turn. I thought about how I had lots of fun making those way back and decided to make one out of scraps off my desk and document it. In building the mousetrap car you need to understand the basic components needed. A ball thrown through the air is affected by fluid friction and a block sliding on a table is mainly affected by surface friction. The cause of surface friction is mutual contact of microscopic irregularities that exists on all surfaces.
One way to try making the energy release slower is to lengthen the lever arm by attaching something pencil, dowel, etc. If there was no friction at all you could not tie a knot in the string, think cooked spaghetti. Note: Alignment is crucial for a straight axle. You could break a finger. Try using graphite powder or even replacing bushings with ball bearings. For the purposes of your mousetrap car, this will mean making your frame both narrow though it will be difficult to get your frame any narrower than the mousetrap itself and vertically skinny. Doing this increases the structural strength of the car while minimizing the change to its air resistance and weight.
The various larger sizes were designed to fit over the smallest ones that were attached to the axels. Finally, I wish we made our changes carefully and easily. Your simple model moves forward a few feet, but how could you design it to go longer distances? A standard sized mousetrap was secured to the chassis and a 3-inch length of copper pipe was used to lengthen the lever to provide more mechanical advantage. The wheel must be balanced around its center if the vehicle is to perform well otherwise the lack of balance could make for a wobbly, bumpy ride - that is, if the wheel is able to turn at all. The traction, or the grip of the car's wheels on the floor, will determine the mousetrap car's maximum acceleration. For long distance cars, a large diameter wheel with a small diameter axel is best.
Friction also plays a major role in the performance of mousetrap-powered cars. A mousetrap car is a model car that has a mousetrap as the engine. However, it will also run out of energy sooner. Ensure minimal friction on your moving parts. The second advantage is that the car takes longer to gain speed accelerate which results in it traveling farther than a car that gains speed faster.
If this happens with your car, adding a friction-inducing material to the rear wheels may reduce their slippage. . Would that not be Fnet? Since the arm of the trap is fairly short, if the car isn't carefully constructed, it can pull on the string too rapidly, causing the wheels to slip and energy to be lost. As the lever pulls the string the axle turns as the string unwinds until all the string has been pulled through at which point the end of the string that was wrapped around the axle should release and the mousetrap car should coast for a distance because of kinetic energy until friction causes it to stop. The process of designing your car is a process that requires testing and re-testing to determine the best performance.
If your rear axle is extremely skinny, your mousetrap car will be able to turn it more times for the same length of string than it would if it were wider. A small diameter of the axle in comparison to the wheel will require more force to get started but will cover more ground per rotation. This article has changes my life. In order to get our vehicle to accelerate to a good speed, we need to make sure that the mousetrap lever-string system outputs the greatest amount of force possible while the car as a whole must be made up minimal mass. Every morning I wake and slip on a mousetrap car down the stairs, I have been to the hospital three times and my wife threatens to leave me. Measurements were also taken at 28 centimeters so a comparison could be done between the calculated and the measured.