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A 2.8kg 40cm diameter disk is spinning at 260 rpm How much friction force must the brake apply to the rim to bring the disk to halt in 2.0s The answer should be in Newtons?
Julieseluj
Torque is equal to friction force (F) * radius (r). Torque is also equal to moment of inertia (I) * Angular acceleration (a). Angular acceleration is equal to rotational velocity * 2Pi/time, which is 2 seconds. So, F = IRa/r, or 45.63 Newtons
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∙ 9y ago
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What unit measures friction?
Friction is a force. I'll get back to that.Weight, which is usually measured in pounds or ounces or grams (depending on where you live or what you're measuring), has an official (SI) unit of newtons. An object's weight depends on the gravity affecting that object. (You probably know that you weigh less on the Moon than you do on Earth.)Gravity, which is a force, is consequently measured in newtons, just like weight. All forces are measured in newtons.Therefore, friction, which is a force, is measured in newtons.
To stop friction what must be used?
Lubrication stops friction. If you put lubricant on a surface, there should be no friction
Will a ball slow down on a level surface without friction?
An object in motion will stay in motion unless and until acted upon by a force like friction. So absent ALL friction, no the ball will not slow. This is part of the laws of Thermodynamics. However, if there is air friction in play, with a long course of time(of course which depends on the velocity with which the ball is moving), the pressure exerted in opposite direction by the ball, at one fine movement should make the ball stop. If considered in vacuum, then again as per Newtons laws, the ball should not stop as there would be no action by any external agency.
Should one add static friction and kinetic friction together to find the total friction force?
No. You use whichever applies: if an object is at rest, you use static friction. If it is moving, you use kinetic friction.
Should friction be reduced if possible?
no not really
What unit measures friction?
Friction is a force. I'll get back to that.Weight, which is usually measured in pounds or ounces or grams (depending on where you live or what you're measuring), has an official (SI) unit of newtons. An object's weight depends on the gravity affecting that object. (You probably know that you weigh less on the Moon than you do on Earth.)Gravity, which is a force, is consequently measured in newtons, just like weight. All forces are measured in newtons.Therefore, friction, which is a force, is measured in newtons.
What is necessary force wise to accelerate a system?
The total input force in a given direction should be positive. (e.g. You have to overcome friction) Then by Newtons law of motion: F =ma or a =m / F which will cause a body to accelerate.
To stop friction what must be used?
Lubrication stops friction. If you put lubricant on a surface, there should be no friction
Will a ball slow down on a level surface without friction?
An object in motion will stay in motion unless and until acted upon by a force like friction. So absent ALL friction, no the ball will not slow. This is part of the laws of Thermodynamics. However, if there is air friction in play, with a long course of time(of course which depends on the velocity with which the ball is moving), the pressure exerted in opposite direction by the ball, at one fine movement should make the ball stop. If considered in vacuum, then again as per Newtons laws, the ball should not stop as there would be no action by any external agency.
What is the diameter of a circle that has a circumfrance of 21.98m?
The diameter should be 7m.
Why friction is important to be in motion?
when the friction is absent during the motion there may be a chance of skidding occurs. there should be some amount of friction during the motion of any body also there should not be too much friction as it decreases efficiency of the vehicle.
Should one add static friction and kinetic friction together to find the total friction force?
No. You use whichever applies: if an object is at rest, you use static friction. If it is moving, you use kinetic friction.
Should friction be reduced if possible?
no not really
What is the measure of the force of attraction between objects due to gravity called?
The force of gravity between two objects is measured in newtons. This is no different, technically, than what weight "should" be measured in. We use pounds and kilograms, but we should be using newtons, to be scientifically correct.
Should your fire spinning staff be taller or shorter than you?
Shorter
If the wire is increased what should happen to the diameter?
If the length of the wire increases its diameter decreases
How does friction positvely effect baseball?
If it weren't for friction, a baseball would slide off of a bat when it should be hit.
