- - scales;
- - speedometer or radar;
- - dynamometer;
- - Calculator.
Determine the body using weights in kilograms.Measure the speed.Do this by using a special radar speedometer or in meters per second.Calculate the momentum of the body p as the product of its mass m at speed v (p = m ∙ v).For example, if the speed body is 5 m / s, and its mass is 2 kg, the momentum is p = 2 ∙ 5 = 10 kg ∙ m / s.
important skill to find the change in the momentum of the body , because the impulse is characteristic of impact at which the value changes.To find the momentum change body , deduct from the final pulse start, bearing in mind that the magnitude of this vector.Thus, the change in the momentum of bodies is the vector Δp, which is the differ
ence vectors p2 (finite impulse) and p1 (initial pulse).
If the motion does not change the direction of the body, in order to find the change in the momentum, subtract the start of the final rate and multiply it by the mass of the body .For example, if the vehicle is moving in a straight line, increasing the speed from 20 to 25 m / s, and its weight is 1200 kg, but will change its momentum Δp = 1200 ∙ (25-20) = 6000 kg ∙ m / s.If the speed body decreases, the change in its momentum is negative.
If the body changes direction, looking for the difference vectors p2, and p1, using the cosine theorem, or other relations.
example.The ball weighing 500 g elastically hit smooth wall 60º angle to the vertical, and it has thus speed 3 m / s, get a change of its momentum.Since the elastic punch, then the ball will fly away from the smooth wall is also at an angle of 60º, with the same modulo speed of 3 m / s.To translate the difference in amount, multiply the value of the vector p1 -1.Get that Δp is the sum of the vectors p2, and -p1.Applying the rule of the triangle, calculate Δp = √ ((0,5 ∙ 3) ² + (0,5 ∙ 3) ²-2 ∙ (0,5 ∙ 3) ∙ (0,5 ∙ 3) ∙ cos (60º))∙ 3 = 0.5 = 1.5 kg ∙ m / s.It is noteworthy that the initial and final module of the pulse in this case, too, by 1.5 kg ∙ m / s.
If you know the force acting on the body, which is the reason for changing the rate and duration of its action, calculate the change in momentum as the product of force F at the time of its action Δt (Δp = F ∙ Δt).Force measure with a dynamometer.For example, if a football player hit the ball with the force of 400 N, and the collision time is 0.2 seconds, the change in the momentum of the ball will be Δp = 400 ∙ 0,2 = 8000 kg ∙ m / s.
Tip 2: How to find the momentum
vain people think that inspiration is necessary only to poets, artists and musicians.Even in the more prosaic matters, rather than the creation of the masterpiece requires momentum , a charge of energy that will give strength to complete the task.There are several ways to find inspiration, and some of them contradict each other.
See what made the most brilliant or recognized professionals in your area.Let's say you want to master the skill of writing articles about travel.Read Jack London, Ilf and Petrov, and other brilliant writers who describe the magnificent language of adventure travels.Learn the lyrics of the best journalists writing about other countries.Many musicians and fashion gurus looking for inspiration from colleagues and even competitors.Critics have continually noted similarities in fashion collections, screenplays and musical themes.After studying the best samples have been taken, you will be able to find its own path to creativity.
Saturate the ideas of others, before creating your own.Good and effective creative tool to find inspiration is to sicken some ideas, then give yourself time to rest and then go back to the topic.If we again recall the example of writing articles about travel, you first need to read a lot of articles and novels on the subject.Just before the moment when you feel fatigue and surfeit of information.Then is the time to take a rest, move on to other things.And after some time to get back to the topic, try to do something yourself.This is the case, about which they say that the idea needed to sleep.
Try to create from scratch.This method is the opposite of those described above.It involves the preparation of a complex problem to forget about all methods of solution, which were before you.It should even reduce contact with colleagues in order not to be infected by their vision of the situation.Turn off at the time of critical thinking, and try to jot down a list of the most ridiculous, the most unusual and unfamiliar ways of solving problems.When the list is sufficient, in your opinion, do cease, including criticism.Choose ideas that are realistic and easy to implement.Most likely, this will be the best solution.