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Questions and Answers
What does a free-body diagram show?
What does a free-body diagram show?
- The temperature of the object
- The known and unknown forces acting on an object (correct)
- The position of the object in space
- The speed of the object
In a free-body diagram, what are pulleys assumed to be?
In a free-body diagram, what are pulleys assumed to be?
- Frictionless and weightless (correct)
- Rough and weightless
- Rough and heavy
- Frictionless and heavy
What is the nature of the frictional force in a free-body diagram?
What is the nature of the frictional force in a free-body diagram?
- It is proportional to the weight of the object
- It increases with speed of motion
- It is opposite the direction of motion (correct)
- It depends on the color of the surfaces in contact
What does the normal force represent in a free-body diagram?
What does the normal force represent in a free-body diagram?
What two factors affect friction according to the text?
What two factors affect friction according to the text?
What does the surface always exert on an object in terms of force?
What does the surface always exert on an object in terms of force?
What is the formula used to calculate friction?
What is the formula used to calculate friction?
Which type of friction keeps the object from moving or staying stationary?
Which type of friction keeps the object from moving or staying stationary?
What is the coefficient of kinetic friction symbolized by?
What is the coefficient of kinetic friction symbolized by?
How is the direction of the coefficient of kinetic friction (µk) in relation to the motion of the object?
How is the direction of the coefficient of kinetic friction (µk) in relation to the motion of the object?
What is the formula for calculating force of kinetic friction (Fk)?
What is the formula for calculating force of kinetic friction (Fk)?
What does static friction depend on?
What does static friction depend on?
What is the maximum value of static friction in the given sample problem?
What is the maximum value of static friction in the given sample problem?
In the sample problem, if a bed is being pulled horizontally by an 875 N force and µk = 0.605, what is the normal force between the bed and the floor?
In the sample problem, if a bed is being pulled horizontally by an 875 N force and µk = 0.605, what is the normal force between the bed and the floor?
When a grocery pushcart is being pushed with a normal force of 825 N, North, what is the friction between the pushcart and the floor if the coefficient of static friction (µs) is 1.0?
When a grocery pushcart is being pushed with a normal force of 825 N, North, what is the friction between the pushcart and the floor if the coefficient of static friction (µs) is 1.0?
Frictional force is always acting along the direction of motion.
Frictional force is always acting along the direction of motion.
Frictional force is directly proportional to the normal force.
Frictional force is directly proportional to the normal force.
Sliding friction depends on the speed of motion.
Sliding friction depends on the speed of motion.
The nature of material and existing questions affect friction.
The nature of material and existing questions affect friction.
The surface always exerts a downward force on the object.
The surface always exerts a downward force on the object.
The coefficient of kinetic friction (µk) is constant for specific materials that are in contact with each other.
The coefficient of kinetic friction (µk) is constant for specific materials that are in contact with each other.
The formula for calculating friction is Ff = µFN.
The formula for calculating friction is Ff = µFN.
The direction of the coefficient of static friction (µs) is always opposite the force that tries to move the object.
The direction of the coefficient of static friction (µs) is always opposite the force that tries to move the object.
In a free-body diagram, the maximum value of static friction can be calculated using the formula Fs ≤ µsFN.
In a free-body diagram, the maximum value of static friction can be calculated using the formula Fs ≤ µsFN.
The coefficient of static friction (µs) depends on the nature of the surface, where a rough surface has a higher µs compared to a slippery surface.
The coefficient of static friction (µs) depends on the nature of the surface, where a rough surface has a higher µs compared to a slippery surface.
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