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Why is rolling friction a type of static friction even though static means not moving?
Wiki User
∙ 15y ago
It's static because the major cause of rolling friction is deformation of both roll and surface it's moving on - surfaces do not slide on each other(at any given instant the relative velocity of point on the roll that touches surface and surface itself is zero - at least in the model). The deformation causes the point of contact to be slightly displaced in front of the moving roll and reaction force at this point plus weight of the rolling object are no longer on the same line. This introduces torque that opposes the rotation of the roll. Rolling friction is essentially static friction because the point of the wheel in contact with the ground does not slide against it, but instead maintains its position. If enough static friction does not exist and the wheel slips against the ground, motion will not be proper. Sliding friction will however be taken into account in that case.
Wiki User
∙ 15y ago
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Why do you keep moving when you slam the brakes on your bicycle?
even though wheels are locked, and not rolling, road friction allows bike to slide until coming to stop
Is it possible to have a coefficient of kinetic friction that is more than 1?
True -It's "False"!
What forces would be at work if you were trying to move a huge block of stone?
If you were trying to move a huge block of stone, the forces of friction would be applied against you. To get the stone in motion, you must overcome static friction, the friction force that acts on objects that are not moving and is always working in the direction opposite of your applied force. Then, to keep it in motion, you must overcome sliding friction, which, though it takes effort to keep moving a stone, is substantially less than the effort to get a stone into motion originally.
Is friction an energy?
No, while friction is often involved in thermal energy release, friction is a mechanical interaction among two or more bodies and/or fluids that give rise to a resistive force..There are two types of friction - static friction and dynamic friction - and their relationship to energy are different. In static friction, the combined surface tension and dynamic friction between two relatively stationary objects presents sufficient resistive force to completely oppose the incidental differential force that tries to make one body move in relation to the other. In other words, the incidental force is not strong enough to overcome the static friction, and consequently neither body moves in relation to the other body. An example is trying to push or drag a heavy box along the ground - the static friction is so strong that, even though you push hard (apply a lot of force), the box does not budge - static friction prevents the box from moving at all. In the case of static friction, no thermal energy is released..In dynamic friction, one body or fluid is in motion with respect to another body or fluid, and the mechanical interaction among them resists their relative motions. An example is riding a bicycle on level ground - dynamic friction opposes the movement of you and the bicycle with respect to the ground and the air, and unless you pedal to overcome the dynamic friction, the bicycle will slow down and eventually stop. When dynamic friction occurs, kinetic energy (speed) is converted into thermal energy (heat), and the heat is released to the immediate surroundings..Note that friction releases other forms of energy, not just heat. Friction often converts kinetic energy into sound - think of squealing brakes. In the case of wind blowing over the ocean, the friction between the air and the water gives rise to ocean waves, which themselves carry energy across the ocean surface.
How is physics counter-intuitive?
There are various instances in physics where what is expected is not true. For example, when you are holding a bucket of water and you want to lower it, you wouldn't push it downward, but you'd rather push up less but still be pushing up. Also, though friction is what causes things to stick, it is also what causes things to move. Without friction, car wheels would not be able to start rolling or to stop moving the car.
What if there is no friction?
in case of no friction- firstly, nothing would be able to stand or stop.for eg, if you roll a ball, it will never stop rolling because friction opposes it's movement and stops it. you'll not be able to walk or even stand(though it could be fun to skate around). so everything would be a mess!
What happens if there is no friction?
in case of no friction- firstly, nothing would be able to stand or stop.for eg, if you roll a ball, it will never stop rolling because friction opposes it's movement and stops it. you'll not be able to walk or even stand(though it could be fun to skate around). so everything would be a mess!
Explain why friction changes the velocity of objects and why friction can make observing newton's first law of motion difficult?
Friction made it difficult to discover newton's first law because under the law an object in motion will remain in motion at a constant velocity unless acted upon by an external force. Friction is an external force that slows objects in motion due to air friction (drag) and rolling resistance, making it appear as though this law is untrue.
Does friction bring most moving things to a stop?
True though, Any two objects touching posses friction and friction can result in different factors, like sounds, heat or a resistance. if you rub your hands together, friction here results as heat. Moving parts in a machine or something can producing some kinda sound. When you are drive in your car, friction not only helps you to stick to road, not roll over and acts an a opposing force which will in matter of time stop the car if you don't apply additional force.
Why driving on a road requaries fricition?
Driving on a road requires friction or else your car or automobile will skid across the road and you will never be able to stop your car from moving. Friction is very important to our daily lives even though we may not even notice it.
How is friction created?
A force is needed to start something moving and to stop it once it is moving. A force can make something speed up or slow down. Friction is a force generated when surfaces move across each other.
Most meteors burn up in the even though it's the coldest layer.?
Mesophere. They don't burn up because of the ambient air temperature, but because of the heat generated by friction - they are moving incredibly fast.
