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Mechanics - Friction MCQs

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Mechanics - Friction

Mechanics - Friction MCQs With Answers

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CSS - PMS - CCE - PCS - General Science Mechanics - Friction
What factor often increases dry friction between two surfaces?
A. Removing contact
B. Greater normal force
C. Lower contact force only
D. Perfect vacuum alone
Correct Answer: B
In simple models, friction is approximately proportional to normal force.
CSS - PMS - CCE - PCS - General Science Mechanics - Friction
Why is friction useful for walking?
A. It causes floating
B. It provides traction between foot and ground
C. It removes gravity
D. It eliminates mass
Correct Answer: B
Static friction allows the foot to push backward on the ground while the ground pushes the person forward.
CSS - PMS - CCE - PCS - General Science Mechanics - Friction
How can friction between moving machine parts often be reduced?
A. Roughening surfaces strongly
B. Increasing normal force
C. Lubrication
D. Removing all bearings
Correct Answer: C
Lubricants separate surfaces and reduce direct contact.
CSS - PMS - CCE - PCS - General Science Mechanics - Friction
Which friction acts when surfaces slide past each other?
A. Buoyant force
B. Kinetic friction
C. Static friction
D. Magnetic force
Correct Answer: B
Kinetic or sliding friction opposes ongoing sliding motion.
CSS - PMS - CCE - PCS - General Science Mechanics - Friction
Which friction acts before sliding begins?
A. Fluid drag only
B. Kinetic friction
C. Rolling resistance only
D. Static friction
Correct Answer: D
Static friction adjusts up to a limiting value to prevent relative sliding.
CSS - PMS - CCE - PCS - General Science Mechanics - Friction
What is friction?
A. A force that always increases motion
B. A force that opposes relative motion or tendency of motion between surfaces in contact
C. A form of temperature
D. A type of mass
Correct Answer: B
Friction acts tangentially at contact surfaces.
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