Roller skating beginners, ask for help!!

What you want to buy is an e3, right, be sure it's an e3, be sure you want to wear it for a long time.

It is recommended that you buy a smaller one, because E3, especially E3, will be worn away, that is to say, wear big, and then the feet will go back and forth in the shoes, and I play with one of the E3 wearing ankle pads now, and the shoes are not big.

Try it when you go shopping for shoes, and buy a smaller size if you can wear it.

Upstairs nonsense, if you buy shoes for yourself, who wants to have to stuff in the shoes in the future, in order to fit the feet, roller skates will generally be worn out, this is common sense.

But if you are 16, will your feet still grow, if you want to grow longer, you just buy the right ones, and even if your feet grow in the future, you will wear them out.

Hehe, he said a lot of nonsense.

o(∩_o...ok？

The E3 series is another series of high-end roller skates successfully launched by K2 Company, which is known for its exquisite workmanship, innovative design and brand excellence.

At present, in order to promote the market, the E3 series has just been reduced in price, and the drop is unprecedentedly high, reaching 50, which is a good shoe with high cost performance on the market in the near future, whether it is a beginner or a master, it is very applicable.

Body] closure system, standard laces, stabbed straps, buckle straps.

The insole, made of new material, absorbs shocks and vibrations from the ground and keeps your feet comfortable while gliding. Wearing it feels like Nike or Adi sneakers.

Shoe rack] aluminum-titanium alloy.

Bearings] K2 series special ABEC-7 bearings.

When buying roller skates, the leather of the shoes should be of good quality, the upper should be firmly connected to the sole, and it should be as light as possible. The wheel frame and bottom plate are required to be light and strong. The requirement for the bearing is that the greater the slippage, the better, you can flick the wheel with your hand, the longer the wheel rotates, the better the smoothness of the bearing.

Polyurethane should be purchased as much as possible, because it is wear-resistant and heat-resistant, has little change in hardness for long-term sliding, and has strong adaptability to various sites. Pay attention to the size of the shoes when buying. In general, the foot should feel close to the shoe in the shoe, and should not move back and forth or left and right, and there should be a feeling that the shoe and the foot grow together.

However, shoes should not be worn too tightly, as too tight will hinder the blood circulation in the feet, causing excessive tension in the feet and leading to premature fatigue. If the shoe is too tight, it is easy to wear out the skin of the foot or cause deformity of the foot. When choosing shoes, you should also pay attention to whether the position of the wheel frame and the shoe installation is appropriate, if it is a general slide, the requirements are not too strict; If it is a competition shoe, it must be strict and suitable for the individual's habits.

First of all, you can wear roller skates on your feet, tighten the straps, and feel if your feet are snug in the shoes and there is no discomfort (over-pressing or moving your feet in the shoes). At this time, it is best to slowly stand up straight with the help of someone (holding your hands), and slowly shift your weight to your right foot (with your left foot slightly raised) to feel if your body weight can be balanced, if your body weight can fall on the center point of the rectangle formed by the four wheels to maintain balance, these roller skates are suitable.

When you're just starting to learn roller skating, it's best to be one size bigger than your foot.

This is a typical dynamic pulley force analysis, first of all, we must know that the force on both sides of the pulley is half of the gravity of the pulley, and secondly, we must know that the rope movement displacement at the free end is twice that of the pulley, so that the total workmanship can be equal. The above is based on the frictionless resistance of the pulley.

The specific calculation is as follows:

f=1/2(2+50)=26n

s=2sa=2*2=4m.

Workmanship: Force, workmanship, w=f*s=26*4=104wwa= -(2+50)*sa= -(2+50)*2= -104w, which shows that the energy of the two is balanced. Your problem is relatively simple, just ask for displacement and force.

Solution: Let the tensile force of the rope be f, and the moving distance of the free end is h

According to the nature of the movable pulley, f=2(m+m)g

H=2L gives f=104N

h=4m

Movable pulley: f = one part of n (g + g moving) = 26n

The movable pulley costs 2 times the distance, so it has to pull 4m

Use at least a tensile force of 26N (50+2)2 =26N

The free end of the rope should be pulled 4 less meters 2*2=4 meters.

（50+2)/2=26n

Conservation of mechanical energy "52n multiplied by 2m = 26 times x pushed out x = 4m

For convenience, g = 10

At the critical time, the rope on b is stressed by 30n

Let the mass of c be m

a force = 60-30 = 30n

c force = 30-10m

Acceleration a=30 6=5=(30-10m) m,a,c are equal m=2kg

If MC>=MA, it is obvious that B will rise, so MC results in A falling and C rising, and the tension between them is less than half that of MB.

Upstairs is the right solution. over

1. Learn to balance corners and straight skies.

2. Slowly reduce the frequency of leg changes, which is to increase the time for one leg to land on the ground and increase the ability to master balance on one foot.

3. Learn to brake and T brake.

4. Do some introductory flat flower movements, such as merging and parting your legs, or crossing them.

5. Learn to slip backwards.

6. Learn the basic flat flower movements, such as crazy

It depends on what you play Each game has different techniques.

Do you mean brakes or flat tweed?