you need
• stopwatch, ruler, a device for measuring the instantaneous velocity.
Guide
1
Take the initial and final angular velocity of circular motion.Measure the time in which to change the speed in seconds.Then, the final angular velocity of the initial rate, subtract and divide this by the time ξ = (ω- ω0) / t.The result is the angular acceleration body.In order to measure the instantaneous angular velocity of a body moving in a circle, via a speedometer or radar measure its linear velocity and dividing it by the radius of the circle along which the body moves.
If the calculation of the value of the angular acceleration is positive, the body increases its angular velocity, if
negative - reduces.
2
When starting off from the rest of the body, measure the time for which it makes a complete revolution (rotation period).In this case, the angular acceleration will be equal to the product of the numbers 4 to 3.14, and the radius of the circle path, divided by the square of the period ξ = 4 • 3.14 • R / T².
3
In that case, if the body moves in a circle with an angular acceleration m, always present and linear acceleration , called tangential.It can be measured by any method known for the linear acceleration.For example, to measure the instantaneous linear speed at a point of the circle and then in the same anguish after one revolution.Then, the difference of the squares of the second and the first measured velocity and to successively divide the number of 4 and 3.14, and the radius of the circle aτ = (v²-v0²) / (4 • 3.14 • R).
4
With known tangential acceleration find the angular acceleration , dividing tangential to the radius of the circle along which the body moves ξ = aτ / R. This acceleration in no way be confused with the centripetal, which is presentEven with a uniform circular motion.If there is no tangential acceleration - angular acceleration zero.