To find instantaneous velocity at uniform motion, divide the distance passed by a body, for a while for which it was overcome. At non-uniform motion, learn value of acceleration and count speed in each timepoint. At free fall the instantaneous velocity depends on the acceleration of gravity and time. Instantaneous velocity can be measured by a speedometer or the radar.
It is required to you
- For determination of instantaneous velocity take the radar, a speedometer, a stop watch, a roulette or a range finder, the accelerometer.
Instruction
1. Determination of instantaneous velocity at uniform motion If a body moves evenly, measure by means of a roulette or a range finder a piece of a way in meters then divide the received value into a period in seconds for which this piece was passed. Measure time by a stop watch. After that find average speed, having divided length of a way for the period of its passing (v=S/t). And as the movement uniform, average speed will be equal to instantaneous velocity.
2. Determination of instantaneous velocity at uneven a dvizheniiosnovny type of non-uniform motion is the uniformly accelerated movement. By means of the accelerometer or any other way measure value of acceleration. After that, knowing the initial speed of the movement, add to it performing acceleration and time throughout which the body is in the movement. The value of instantaneous velocity of time will be at present result. (v=v0+a•t). When calculating consider that if the body reduces the speed (brakes), then the value of acceleration will be negative. In case the movement begins from a condition of rest, initial speed is equal to zero.
3. Determination of instantaneous velocity at a free padeniidlya of determination of instantaneous velocity of freely falling body it is necessary to make time of falling to increase by acceleration of gravity (9.81 m/s²), calculation for formula v = g•t. Consider that at free fall the initial speed of a body is equal to zero. If the body falls from the known height, then for determination of instantaneous velocity at the time of falling from this height increase its value in meters by number 19.62, and take a square root from the received number.
4. Determination of instantaneous velocity a speedometer or the radar If a moving body is equipped with a speedometer (car), then on its scale or an electronic board the instantaneous velocity of time continuously will be displayed at present. At observation of a body from a motionless point (earth), send a radar signal to it, on its board the instantaneous velocity of a body of time will be displayed at present.