# Friction

## Quiz by Cyrus Flores,

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20 questions
• Q1
Which of the following factors affect the magnitude of friction?
velocity and temperature
density and volume
normal force and surface roughness
mass and acceleration
30s
• Q2
Static friction occurs when:
an object is moving in a straight line
an object is sliding down a ramp
two surfaces are at rest relative to each other
two surfaces are moving past each other
30s
• Q3
Friction is the force that:
opposes motion
increases motion
causes motion
has no effect on motion
30s
• Q4
Which of the following factors can reduce friction?
applying lubricant
roughening the surfaces
increasing weight
increasing the normal force
30s
• Q5
What is the definition of the normal force?
The force that causes an object to accelerate.
The force exerted by an object in motion.
The force of gravity exerted on an object.
The force exerted by a surface to support the weight of an object resting on it.
30s
• Q6
In which direction does the normal force act on an object?
Perpendicular (or normal) to the surface
Opposite to the direction of motion
Parallel to the surface
In the same direction as the force applied
30s
• Q7
What is static friction?
The force that opposes the start of motion between two surfaces in contact
The force that pulls objects towards the center of the Earth
The force exerted by a moving fluid on an object
The force that occurs when an object is in motion
30s
• Q8
How does static friction compare to kinetic friction?
Static friction is generally less than kinetic friction
Static friction is generally greater than kinetic friction
Static friction only occurs on rough surfaces
Static friction and kinetic friction are equal in strength
30s
• Q9
Which statement best describes static friction?
It decreases with the applied force
It is only present when an object is in motion
It increases with the roughness of the surface
It always remains constant for a given pair of surfaces
30s
• Q10
What is the maximum value of static friction?
It is always equal to the weight of the object
It is always zero
It varies depending on the coefficient of static friction and the normal force
It is the same for all surfaces
It is always equal to the applied force
30s
• Q11
Which of the following is true about the coefficient of kinetic friction?
It depends solely on the mass of an object.
It is typically higher than the coefficient of static friction.
It is typically lower than the coefficient of static friction.
It remains constant for a given pair of surfaces.
30s
• Q12
What is kinetic friction?
The force that causes an object to move in a circular path.
The force experienced by an object at rest.
The force that increases an object's velocity.
The force that opposes the relative motion between two surfaces in contact.
30s
• Q13
What is the approximate value of acceleration due to gravity on Earth?
1 m/s^2
4.9 m/s^2
16 m/s^2
9.8 m/s^2
30s
• Q14
If an object is dropped from a tall building, how does its velocity change due to acceleration due to gravity?
It remains constant
It decreases
It increases
It fluctuates
30s
• Q15
Which of the following is a measure of the friction between two surfaces?
Acceleration
Force
Velocity
Coefficient of friction
30s

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