if there are any smart science type people out there please help me!?

Question

why is there a force involved when the sails of a wind mill turn?
why do athlets shoes often have cleats on them?
how is inertia responcible for getting most of the water out of the clothes that are in the washing machine?
these are all science questions please help me!

Answer 1

Hi. The old windmills had angled surfaces which had an unbalanced load when the wind push against them. Newer one have airfoils which have push and lift and are much more efficient. Cleats dig into the ground (on grass) to reduce slippage and transfer more power from the legs to the ground. Spinning increases the g force on wet cloths, which causes the water to 'drip' out much faster.

Answer 2

I'm not sure, but here are my answers:
1. When the windmill turns, some type of force is needed to make it turn in the first place because of its inertia. Inertia is the tendency of an object to resist movement when it is still and the tendency to keep on moving when a force is applied to it.
2. The cleats help to increase friction between the shoes and the ground, so it increases the shoe's grip. This helps to prevent slipping.
3. As the washing machine shakes, the water in the clothes is in motion. When the washing machine stops, the water is still in motion due to its inertia. This helps the water escape from the clothes.

Answer 3

first question, nothing mechanical happens without frce, if nothing goes in, nothing comes out, so the wind is the force that drives the windmill.

simple experiment for this, stand a book up and do nothing, the book will stay standing, apply force(push the book) and it falls.


second question, not sure what clefts r, im not an athlete, but if its the spikes or the grooves, they are to increase friction between the runner and the track, the greater the friction, the closer the athlete is to achieveing greater efficiency from transferring all the energy from his legs into horizontal movement,
with flat shoes he would slip and this would not be efficient for wht he is trying to achieve because a lot of energy would be lost]

3rd question, inertia pushes the water out of the clothes, its similar to a centrifuge, well it is the same force, as it spins the G forces push everything from the centre of the spinning drum to the outside, the clothes dont fit throught the small holes but the water can so its pushed out, hope this helped. inertia is the g forces involved with the high spinning drum, its called centrifugal force, pushes evrything away from the centre of whatever is spinning.

a simple experiment for this is to put water in a small bucket and spin it round ur head quickly, inertia keeps it in the bucket.

Answer 4

* sails on a wind mill turn due to a difference in air pressure on the surfaces of the sails.
* Athletic shoes have cleats to provide better traction.
* Centripital force removes water from clothing.

I guess this is your homework.