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Why convection occurs only the liquid s and gases only but not in solids?
The molecules in solids are not free to move around as they are in liquids and gasses. It's the movement of the molecules that creates the convection currents.
What acts only between surfaces that are in contact?
Friction
Why sliding friction greater than rolling friction and if the area of contact is same?
The FORCE of Friction is INDEPENDENT of Surface Area. Only the 'Coefficient of Friction', and the Force between the two Surfaces. Sliding Friction is greater than Rolling Friction ONLY if the Coefficient of Friction is GREATER for the Sliding Surfaces.
Can charging by friction occur only in solid?
Yes, in fact any substance which has an atomic interface will both gain and lose charges by friction. For example is the wind blowing on the surface of the ocean. There are two fluids (Water and air) which are pushing against each other at a central location called the interface. The wind has a negative charge and picks up positive charges and ions from the water. This causes charging by friction between 2 non-solids.
The force you have to overcome to start an object moving is .?
I have to guess either gravity or friction.If by that you mean a force that opposes the start of motion, then your force would be static friction.Static friction only occurs before an object starts moving, as opposed to kinetic friction which occurs when the objects is moving or sliding. The equation for static friction is: Ff = (coefficient of static friction) * FNInertia
Why convection occurs only the liquid s and gases only but not in solids?
The molecules in solids are not free to move around as they are in liquids and gasses. It's the movement of the molecules that creates the convection currents.
What is acts only between surfaces that are in contact?
Friction
What acts only between surfaces that are in contact?
Friction
Why sliding friction greater than rolling friction and if the area of contact is same?
The FORCE of Friction is INDEPENDENT of Surface Area. Only the 'Coefficient of Friction', and the Force between the two Surfaces. Sliding Friction is greater than Rolling Friction ONLY if the Coefficient of Friction is GREATER for the Sliding Surfaces.
Can charging by friction occur only in solid?
Yes, in fact any substance which has an atomic interface will both gain and lose charges by friction. For example is the wind blowing on the surface of the ocean. There are two fluids (Water and air) which are pushing against each other at a central location called the interface. The wind has a negative charge and picks up positive charges and ions from the water. This causes charging by friction between 2 non-solids.
The force you have to overcome to start an object moving is .?
I have to guess either gravity or friction.If by that you mean a force that opposes the start of motion, then your force would be static friction.Static friction only occurs before an object starts moving, as opposed to kinetic friction which occurs when the objects is moving or sliding. The equation for static friction is: Ff = (coefficient of static friction) * FNInertia
Is there any readable level of friction between two magnets passing by each other?
If the magnets are touching, then yes there is, if they are at a distance then the only friction they would have is from the air between them.
What are the variables that determine the force of friction between a wooden block and the surface on which it is resting?
Gravity is the only force of friction if it and the environment is at rest.
Where is friction needed in a backhoe loader?
You would need friction between the tires or tracks and the dirt the tractor is sitting. If you have extended legs, you need friction between the pads and the ground. You would want friction in the brakes. A clutch also relies on friction. Technically you could "dig water", but if you are trenching, then one needs friction between the dirt particles. It is also handy to have friction in your seat, steps, and controls.
Where is friction a problem on a skateboard?
For a skateboard, friction works between the wheels of the board and the axis, as well as between the wheels of the board and the ground when the board is in motion. Since friction works in a direction opposing motion, it is only in effect when the when the board or the wheels of the board are in motion.
How are atoms organized in solids and liquids?
solid only vibrates and liquids are inter mediate between solid and gas.
Does the surface area of an object affect the amount of friction between the object and the surface?
No, it doesn't, the only important thing is the force perpendicular to the surface (weight) and friction coefficient.
