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sharming14
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I have to teach Tires to my class and I want to do something innovative and new that will tie into Physics. Please help and any ideas you have that I could use would be greatly appreciated
sharming14 said:I have to teach Tires to my class and I want to do something innovative and new that will tie into Physics. Please help and any ideas you have that I could use would be greatly appreciated
sharming14 said:Hello thanks for replying, this is a high school grade 11 class just learning forces I need a good way to introduce friction while giving them something they can really relate to
In summary, rubber tires, kiln tires and eye pressure measurement share a common mechanical behaviour.
It is about forces, defromations, elasticity, contact.
No need to stress that good tire contact is important for driving safely.
How on Earth are you justifying that a big steel ring (steel is generally pretty stiff) is in anyway similar in mechanical behaviour to a pneumatic rubber tyre?
Would you care to explain what you mean by this?No need to stress that good tire contact is important for driving safely.
sharming14 said:Hello thanks for replying, this is a high school grade 11 class just learning forces I need a good way to introduce friction while giving them something they can really relate to
jack action said:This is a nice experiment: http://www.fearofphysics.com/Friction/friction.html"
It shows that:
- the weight of the vehicle does not change braking distance
- changing the surface type, changes the friction coefficient
- the kinetic energy of the vehicle (½mv²) has been transformed into heat by the friction force (force X distance)
- maximum braking force depends only on the tire-road properties (and not the brake system)
xxChrisxx said:Before showing this it's got to be made clear the differences between braking with rolling wheels and braking with sliding wheels. As point one only really applies with sliding wheels and the same compound rubber and assuming a linear friction effect.
cjl said:With tires, weight does play a significant role though. Rubber tires deform and behave in ways which do not really follow the simple linear relation that is usually taught in physics. This is also related to the fact that sports cars and racing cars use very wide tires. If rubber behaved in the way a lot of people are assuming here, then there would be no point to this. The standard friction equation does not care at all about surface area. However, because rubber has some "stickiness", the width of the tire actually does matter. Similarly, the weight on a given set of tires matters.
Because of tire load senstivity, the heavier car takes longer. Wiki link (although it shows some numbers for lateral force, the same issue affects forwards and backward forces):jack action said:the weight of the vehicle does not change braking distance
Static friction force at the tires does not generate any heat. Deformation of the tires due to load factor, weight and braking forces, generates heat (hysteresis) but most of the heat lost when braking is due to dynamic (kinetic) friction at the brakes.The kinetic energy of the vehicle (½mv²) has been transformed into heat by the friction force (force X distance)
Assuming the brakes are not overheated, which reduces their coefficient of dynamic friction.maximum braking force depends only on the tire-road properties (and not the brake system)
One idea could be to have students design and build their own model tire using materials such as cardboard, rubber bands, and paper clips. Then, have them test their tires on different surfaces and record their observations and measurements to understand the physics behind tire traction and friction.
Consider incorporating hands-on activities, such as having students participate in a mini tire-changing competition using real tires and tools. This will not only make the lesson more fun, but also allow students to experience the physical forces at play when changing a tire.
Yes, there are several online resources and simulations available, such as PhET Interactive Simulations and Tire Science. These can be used to visually demonstrate concepts and allow students to manipulate variables and observe the effects on tire performance.
You can discuss the importance of tire design and engineering in the automotive industry and how it affects safety and performance. You can also have students research and present on the physics behind different types of tires used for different purposes, such as racing tires or tires for different weather conditions.
In addition to traditional assessments, such as quizzes and tests, you can also have students create their own experiments to test the performance of tires and present their findings to the class. This will not only assess their understanding, but also encourage critical thinking and creativity.