Which of the following statements about the force of friction are accurate? (Choose all that apply) The force of friction decreases as velocity increases. Increasing the surface area of an object will increase the force of friction. All objects have the same coefficient of friction with each other. The force of friction acts in the direction opposite of motion. The force of friction is determined, in part, by the magnitude of the normal force. Increasing the mass of an object will increase the force of friction.
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The force of friction decreases as velocity increases.
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Increasing the surface area of an object will increase the force of friction.
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All objects have the same coefficient of friction with each other.
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The force of friction acts in the direction opposite of motion.
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The force of friction is determined, in part, by the magnitude of the normal force.
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Increasing the mass of an object will increase the force of friction.
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1. The force of friction decreases as velocity increases.
Friction is proportional to normal force, so as normal force magnitude increases, so does friction. Thus friction decrease as speed increases.
2. Increasing the surface area of an object will increase the force of friction.
The friction coefficient is a surface property that does not change for any object. Thus, only the weight of the object and the surface properties influence friction. When you increase the area without changing the mass, the magnitude changes cancel each other out.
3. All objects have the same coefficient of friction with each other.
The coefficient of friction is determined by the objects causing friction. The value is usually between 0 and 1, but it can be higher.
4. The force of friction acts in the direction opposite of motion.
Friction always acts in the opposite direction of movement, i.e. it opposes an object's motion. Air resistance is a frictional force that opposes air motion.
5. The force of friction is determined, in part, by the magnitude of the normal force.
The magnitude of static friction is proportional to the magnitude of the normal force and the roughness of the sliding surfaces. The coefficient of friction is the ratio of the magnitude of frictional force divided by the magnitude of normal force.
6. Increasing the mass of an object will increase the force of friction.
The gravitational force is equal to mass multiplied by gravity's acceleration. As a result, as mass increases, weight increases, normal force increases, and friction increases.
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