you need
• - speedometer;
• - a device for measuring distance;
• - stopwatch.
Guide
1
To find the centripetal acceleration, measure the speed of a body moving in a circular path.You can do this by using the speedometer.If you install this device is not possible to calculate the linear velocity.To do this, note the time that was spent on a complete revolution on a circular path.
2
This time is the period of rotation.Express it in seconds.Measure the radius of the circle on which the moving body is a ruler, tape measure or laser range meters.To find the speed of the product get the number 2 and number π≈3,14 radius R of the circle and divide the result by the period T. This will be the linear velocity of the body v = 2 ∙ π ∙ R / T.
3
find the centripetal acceleration ats by dividing the square of the linear velocity v on the radius of the circle along which the body moves R (ats = v² / R).Using the formula to determine the angular velocity, frequency and period of rotation find this value for other formulas.
4
If you know the angular velocity ω, and the radius of the path (a circle of which the body moves) R is the centripetal acceleration is equal ats = ω² ∙ R.When the body is known rotation period T, and the radius of the trajectory R, ​​then ats = 4 ∙ π² ∙ R / T².If you know the speed ν (the number of full rotations per second), define a centripetal acceleration formula ats = 4 ∙ π² ∙ R ∙ ν².
5
Example: the car, the radius of the wheel is 20 cm, moving on the road at a speed of 72 km / h.Determine the centripetal acceleration extreme points of the wheels.

Solution: linear velocity of points of any wheel will be 72 km / h = 20 m / s.The radius of the wheels turn in meters R = 0,2 m. Calculate the centripetal acceleration, substituting the resulting data into the formula ats = v² / R.Get ats = 20² / 0,2 = 2000 m / s².This centripetal acceleration at uniform rectilinear motion will be at the extreme points of all four wheels of the car.