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What type of surface provides a lot of friction?
Rough surface provides lot of friction.
Reflects a lot of light from its surface?
metals with these propeties reflects a lot of light from its surface
Why does it hurt to hold a heavy parcel by the spring?
it hurts to hold a heavy parcel by the string because you are holding a small surface area meaning that the force is more recognisable and the pain is a lot more intense because of the small surface area the pain is more concentrated.
Give two examples of vector quantities?
Velocity, acceleration, displacement, there are a lot.
How is fluid rolling sliding and static friction increased?
The resistive forces of each of those types of friction except for fluid friction depend on both the normal force (exerted on the object by the surface that it's on) and the friction coefficient that corresponds to that type of friction. So naturally we'd increase the force of friction by increasing either or both of those factors. The friction coefficent can be increased by making the surfaces "rougher" so that more of the energy is lost by being turned into heat and/or sound. We can also increase the normal force to increase the force of friction. The most straightforward way is to make the object heavier so that the supporting surface pushes harder against the object, increasing the force of friction. It's important to know that the the normal force decreases when the surface becomes increasingly slanted. For example, an object dropped against a wall is not being held up by the surface at all so there's no normal force. So we can increase the force of friction by making sure that the surface is completely parallel to the ground. That way, the surface is supporting the entire force due to gravity acting on the object. We can also be extreme by changing the "apparent weight" of the object. If the object is on a surface that's accelerating upwards (like an elevator), the force of friction will be higher than normal because the surface will be pushing even harder against the object. For each of the individual friction types, there are some differences. Sliding and static friction are similar to each other. On the other hand, rolling friction often depends on internal friction in the wheel bearings. That's why bearings often use balls to minimize contact area and are well-lubricated. Fluid friction increases with velocity and depends on how viscous the fluid is. The exact relationship between velocity and drag depends a lot on the geometry and speed of the object.
How does the uneven surface of the rubber soles of your shoes help to increase the friction on a rainy day?
that will increase the total surface area of the base of the shoe and thus will increase the friction force and this help a lot ex-specially on rainy day
Why does crushing help a solid solute dissolve?
The rate of dissolution of a solid is dependent on the surface area reaction. By crushing the cube, the surface area is greatly increased, thus increasing the rate of dissolution.
What happens when you increase the surface area of a solid?
It reacts with other chemicaps a lot faster because there are more particles readily available at one point in time for reactions to occur
Why do the villi have lots of capillaries inside them?
To increase the surface area of which the products of digestion can diffuse across (into the blood)
What does spongy bones have a lot of?
It has a lot of blood vessels, and a high surface area to mass ratio.
How many fin's should a rocket have?
It depends on a lot of stuffs like how much do you want your rocket to be stabile. But at least it must be 3. For example for the same stability you may have 3 fins that have large surface area or 4 which is smaller or more. When you increase the number of fins with the same surface area then the drag will increase because of the surface friction so 3 or 4 fins are generally used but there is no certain limit of the number of fins .
How does surface area affect temperature?
Surface area does not really affect temperature. It affects heat transfer. A car's radiator has thousands of fins that increase the surface area to increase heat transfer between the air and water. The radiator is a heat exchanger that follows the rules found here Based on heat transfer, surface area can indirectly affect temperature. If your house is surrounded by a paved road the temperature will not be as warm as if it were located in the center of a huge parking lot. The larger parking lot area can convert more radiant energy from the sun and release more to the air surrounding your house.
How many neurons and intestinal cells each have greatly increased surface area?
A sufficiently high ratio of surface area to volume is especially important in cells that exchange a lot of material with their surroundings.
What does villi do in the body?
In the intestinal wall, the villi (with micro-villi on them) are used to increase the surface area (just like the inside of your lungs do). This means that in the relatively small space, a lot of the nutrients in the food you eat can be absorbed by them and then diffused into the blood stream.
What problems does a big cell have surface area to volume ratio?
The main problem with a big cell is that the ration of the surface to the volume is small. That means that there is a lot of stuff inside the cell that needs water, electrolytes, energy, etc, and if the cell doesn't have a very big surface area, it will be difficult for enough of those needed things to enter the cell. This is why there are not very many large single-celled organisms. I think amoebas are among the largest single-celled organisms, and can be visible to the naked eye.
Why does it hurt a lot if you sit on a pin?
all the pressure and weight is on one point and the pressure is on a small surface area.
Why do our lungs have a huge amount of capillaries?
It is because your body requires a lot of surface area for diffusion of gasses into the blood.
