Friction
Quiz by Cyrus Flores,
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20 questions
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- Q1Which of the following factors affect the magnitude of friction?velocity and temperaturedensity and volumenormal force and surface roughnessmass and acceleration30s
- Q2Static friction occurs when:an object is moving in a straight linean object is sliding down a ramptwo surfaces are at rest relative to each othertwo surfaces are moving past each other30s
- Q3Friction is the force that:opposes motionincreases motioncauses motionhas no effect on motion30s
- Q4Which of the following factors can reduce friction?applying lubricantroughening the surfacesincreasing weightincreasing the normal force30s
- Q5What 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
- Q6In which direction does the normal force act on an object?Perpendicular (or normal) to the surfaceOpposite to the direction of motionParallel to the surfaceIn the same direction as the force applied30s
- Q7What is static friction?The force that opposes the start of motion between two surfaces in contactThe force that pulls objects towards the center of the EarthThe force exerted by a moving fluid on an objectThe force that occurs when an object is in motion30s
- Q8How does static friction compare to kinetic friction?Static friction is generally less than kinetic frictionStatic friction is generally greater than kinetic frictionStatic friction only occurs on rough surfacesStatic friction and kinetic friction are equal in strength30s
- Q9Which statement best describes static friction?It decreases with the applied forceIt is only present when an object is in motionIt increases with the roughness of the surfaceIt always remains constant for a given pair of surfaces30s
- Q10What is the maximum value of static friction?It is always equal to the weight of the objectIt is always zeroIt varies depending on the coefficient of static friction and the normal forceIt is the same for all surfacesIt is always equal to the applied force30s
- Q11Which 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
- Q12What 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
- Q13What is the approximate value of acceleration due to gravity on Earth?1 m/s^24.9 m/s^216 m/s^29.8 m/s^230s
- Q14If an object is dropped from a tall building, how does its velocity change due to acceleration due to gravity?It remains constantIt decreasesIt increasesIt fluctuates30s
- Q15Which of the following is a measure of the friction between two surfaces?AccelerationForceVelocityCoefficient of friction30s