To find average speed? measure length of a way which passed a body? and time which it moved and then divide these values. Instantaneous velocity is measured by a speedometer in each timepoint.
It is required to you
- roulette or ruler, stop watch.
Instruction
1. Measurement of average speed to measure the average speed of a body, include a stop watch or hours at the beginning of a way and measure its length, having switched off a stop watch in an extreme point. After that, divide length of a way into time and receive speed. Units of measure will be equal to units in which the distance is measured, divided into time units of measure. For example, meters in a second or kilometers per hour.
2. Measurements of speed of the body falling on the Earth's surface For measurement of speed of the body which is freely falling on the Earth's surface pick up height and such body that it was possible to neglect air resistance. Well the steel or lead weight which is freely falling from height to 10 m will approach. Measure height from which the body falls. Then increase numerical value of height by 19.62, and take a square root from the received number. It will be value of speed of a body when falling from assigned altitude. If the body is in flight, then for finding of its current speed take away value of height at which there is a body at present from initial height, also increase by 19.62 and take a square root.
3. Body speed at uniformly accelerated dvizheniiyesl a body moves uniformly accelerated from a condition of rest, measure distance which it passed by means of a roulette or in a different way and also time in a way by means of a stop watch. After that increase distance by 2 and divide into value of time. If the body does not disperse, and brakes, then the way is measured from a point of the beginning of braking to a full stop. The formula is applied the same.
4. Measurement of instantaneous velocity of a body For measurement of instantaneous velocity of a body is used the device which is called a speedometer and is installed in a moving object. For obtaining value it is necessary just to look at its scale or an electronic board. From the outside instantaneous velocity is measured by the laser radar. For this purpose direct the radar to a moving object, and on the screen its speed will be displayed.