- - stopwatch;
- - Radar;
- - Calculator;
- - protractor.
Find a maximum lifting height of the body is thrown up with a stopwatch.It does not matter whether the body is thrown vertically or at an angle to the horizon.Using a stopwatch, note the time that the body was in flight.Measure the time in seconds.Since half of the time spent in flight body rises, falls into the second half, the resulting value divide by 2.
calculate the maximum lifting height of the body H. To do this, lift divided by 2 flight time t in the square.Multiply the value obtained by the gravitational acceleration g≈9,8 m / s², and the result is divided by the numbe
r 2, H = g ∙ t² / 2.Height get in meters.
example.After throwing on the surface of the Earth body again fell on her through 4, at which the maximum height it rose?Take the time to lift the body to the maximum height.It is equal to half the total travel time 4/2 = 2.Substitute a value in the formula H = g ∙ t² / 2 = 9,8 ∙ 2² / 2≈20 m. If you do not want greater accuracy, the value of the gravitational acceleration can be taken to 10 m / s².
Determine the maximum lifting height of the body, if we know its initial velocity.It can be measured by special radar.In some devices, it is initially unknown.In that case, if the body is running vertically to the initial velocity v0, to find the maximum lifting height of the body square divide this initial velocity by twice the value of acceleration of gravity, H = v0² / 2 ∙ g.The speed must be measured in meters per second.
Find a maximum lifting height of the body, the initial velocity v0 which is directed at an angle to the horizon.When calculating mind that the body responsible for raising only the vertical component of the velocity, which is equal to v0y = v0 ∙ sin (α), where α - the angle to the horizon, under which the body began its movement, its measure protractor.Then calculate the maximum lifting height of the body, you can use the formula described in the previous paragraph, and multiply the result obtained by the sine of α, squared H = (v0² / 2 ∙ g) ∙ sin² (α).
- maximum height