You are given a sufficiently long piece of thread, a meter stick and a thin round shape iron rod. Explain how would you measure the diameter of iron rod by using given thread and meter stick.
This length = n x 2πr, where n is the no. of windings and r is the radius of the rod.
Therefore, the diameter of the rod = 2r = The length of wire used for ‘n’ windings /nπ
How is Physics applied in Breaking things in Karate Demonstrations?
The following video explains it well. If you have further doubts, please post them as comments to this post.
I have been told a larger wheel/tyre decrease acceleration because its harder to turn the wheel making the car rev slower.
But the same person tells me it will increase the top speed.
My question is if the car has a max rev of 8000rpm but only reaches 7000rpm in its highest gear would a smaller wheel/tyre not make it easier for the car to rev higher thus possible increasing the top speed by using a smaller wheel?
The pressure exerted by a given force can be decreased by increasing the area of contact.
The equation shows that pressure is inversely proportional to area.
FOUNDATION OF BUILDINGS
The foundation off building is made more broader than the rest of the building so that the pressure exerted by the weight on earth can be decreased.
SHOULDER STRAPS OF SCHOOL BAGS
The shoulder straps of school bags are made wider and soft so that the pressure exerted by the heavy bags on shoulders can be reduced. You can feel the paining pressure if you try to replace the broad strap with a narrow one.
FEET OF ELEPHANT AND CAMEL
The Military tanks have a broad chain so that the pressure exerted by the heavy vehicle on ground is a minimum and it can travel even through marshy places
- Heavy Vehicles have more tyres
- When vehicles get struck in marshy places, wooden planks are used for the vehicle to come up.