I'm trying to help my brother with homework and I can't fin dthe answers to these questions on his study guide...does anyone no the answers to these so that i can help him/aide him through to get the correct answer? THANKS so much. It'd mean a lot to me!
What does friction depend on?
What is gravity measured in?
What does the strength og the force of the friction depend on? (two factors)
How is friction involved in sledding and skiing?
Why does some friction occur with seemingly smooth surfaces?
2006-10-16 14:42:38 · 12 answers · asked by Lina 4 in Education & Reference ➔ Homework Help
Friction depends on the surfaces in question i.e. how smooth or how rough it is.
Gravity? That's a strange way to pose it. Gravitational force, force of gravity is measured in Newtons. Acceleration due to gravity is measured in meters per second squared. F(of gravity) = mg where g is acceleration due to gravity.
F = u*N where u is the coefficient of friction (roughness of the surface) and N is the force of the reaction from the supporting surface.
Friction in sledding and skiing determines the velocity of how fast you can go down the slope. If your skis are sticky you get stuck and go very slowly. If your skis are properly surfaced then you go pretty fast.
Friction occurs with seemingly smooth surface because this surface doesn't look as smooth if you look under the microscope. There are still bumps and dips that you don't see with the naked eye that contribute to friction.
2006-10-16 14:44:27 · answer #1 · answered by Snowflake 7 · 1⤊ 1⤋
Friction depends on the normal force and the coefficient of friction (static or dynamic). Friction force equals the two multiplied. The normal force is the component of the objects weight in the direction perpendicular to the direction of the frictional force.
Gravity is measured in units of gravity, or g's. One g=9.8 m/s^2 in metric or 32.2 ft/s^2 in english. Thus, an acceleration of 20 m/s^2 is approximately 2g's metric.
You want to minimize friction in sledding or skiing to go fast, but without it, you would have no control and could never turn. Friction is a force that always opposes the motion of the object. And forces in general cause an object to accelerate. That is, to change its speed or direction or both. So, the frictional force allows the skis to turn, but also slows them down.
Even on a smooth surface, there is friction at the microscopic (or atomic) level. Nothing is so smooth that the coefficient of friction between the two surfaces is 0.
2006-10-16 14:57:41 · answer #2 · answered by bandl84 3 · 0⤊ 1⤋
Friction depends on electrical forces. Other answers might be acceptable here, depending on the detail of the class.
The force of gravity is measured in force units: Newtons for example
force of friction = coefficient of friction times the normal force.
normal force means the component of force that is perpendicular to the surface. If an object is sliding on a horizontal surface, all of its weight is normal to the surface. If you angle the surface then only part of the weight will be normal to the surface.
The most important frictional forces in sledding/skiing are those involved in steering.
On a microscopic level, the surface that seemed smooth at a macroscopic level, is not so smooth.
2006-10-16 14:53:48 · answer #3 · answered by Anonymous · 1⤊ 1⤋
1. Friction depends on surface, weight, mass, etc.
2. Gravity is measured by acceleration times mass. It is measured IN Newtons, after Sir Isaac Newton, the scientist most credited with the discovery of gravity.
3. Strength of force of friction:
a. magnitude of forces holding objects together (force, strength, velocity)
b. texture of two objects (i.e. it will take more velocity to rub two rough objects together than it will to rub smooth objects together)
4. Velocity will be achieved by the force (weight) on sled or ski. As pressure is applied, the snow and sled or ski will react as the sled/ski will be moving quickly.
5. Friction will increase with smooth surfaces due to electrostatic forces released by atoms. Basically, it is easier to apply velocity and force, so electrostatic force will be achieved, increasing friction.
2006-10-16 14:54:31 · answer #4 · answered by : ) 4 · 1⤊ 0⤋
friction depends the lack of smoothness of two surfaces being in contact with each other.
gravity is measured in length per second squared. Gravity is a form of acceleration.
the velocity of the moving object and the roughness of the substances
the lower the friction, the faster the sledding and skiing
because no object is completely smooth. All substances are made of smaller particles (crystals, molecules, atoms, etc. The shape of those particles, and the space between those particles creates an uneven surface, even though the unevenness is not visible to the naked eye.
2006-10-16 14:51:51 · answer #5 · answered by Marcella S 5 · 1⤊ 1⤋
Friction is created when two opposite objects come together Friction is the force that opposes the relative motion or tendency of such motion of two surfaces in contact
other words friction depends on two two or more items in motion coming in contact.
2-Gravity i smeasured in weight in simple terms. how ever now gravity can be measured in speed. gravity's propagation speed is equal to the speed of light within an accuracy of 20 percent," said
3-The coefficient of friction (also known as the frictional coefficient) is a dimensionless scalar value which describes the ratio of the force of friction between two bodies and the force pressing them together.
4-The coefficient of friction depends on the materials used -- for example, ice on metal has a low coefficient of friction
5-ujder the laws of motion some friction will be present even if only knetic
2006-10-16 15:09:35 · answer #6 · answered by Anonymous · 0⤊ 1⤋
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2016-11-23 15:23:01 · answer #7 · answered by ? 4 · 0⤊ 0⤋
Snowflake is right.
Friction also depends on surface area.
Friction will always occur even between two seemingly smooth surfaces because their are still microscopic bumos on those surfaces that will rub together.
2006-10-16 14:54:17 · answer #8 · answered by Schnickle 3 · 0⤊ 1⤋
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2006-10-16 15:02:46 · answer #9 · answered by Girl 1 · 1⤊ 0⤋
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2006-10-16 15:01:02 · answer #10 · answered by ny 1 · 1⤊ 0⤋