Quiz for Friction

Q1: What is the direction of frictional force on a moving object?

A. Same as motion B. Opposite to motion C. Upward D. Downward

Q2: Which force prevents us from slipping while walking?

A. Gravitational force B. Normal force C. Frictional force D. Tension

Q3: Unit of coefficient of friction is:

A. kg/m² B. N C. It has no unit D. m/s²

Q4: Static friction is always:

A. Equal to kinetic friction B. Greater than limiting friction C. Less than kinetic friction D. Less than or equal to limiting friction

Q5: The maximum value of static friction is called:

A. Limiting friction B. Kinetic friction C. Rolling friction D. Normal force

Q6: Which friction is the least in magnitude?

A. Static B. Kinetic C. Rolling D. Limiting

Q7: Friction converts kinetic energy into:

A. Potential energy B. Heat C. Sound D. Light

Q8: Which one reduces friction?

A. Oiling B. Rough surface C. Weight increase D. Dry surface

Q9: The frictional force depends on:

A. Surface area in contact B. Mass of the object C. Normal reaction D. Velocity of object

Q10: Kinetic friction is:

A. Greater than static friction B. Equal to static friction C. Less than limiting friction D. Independent of motion

Q11: Which device reduces rolling friction?

A. Brake B. Axle C. Ball bearing D. Pulley

Q12: When does kinetic friction act?

A. Before motion starts B. During uniform motion C. Only at rest D. Never

Q13: Static friction can have:

A. Only one value B. A fixed value C. Any value up to a limit D. Zero always

Q14: Friction is caused due to:

A. Gravitational pull B. Adhesion between surfaces C. Normal force D. Air resistance

Q15: The force required to keep a body moving uniformly is:

A. Zero B. Equal to weight C. Equal to kinetic friction D. Greater than friction

Q16: Which method increases friction?

A. Oiling B. Using ball bearings C. Making surface rough D. Polishing

Q17: The direction of friction on a rolling ball is:

A. Opposite to rolling B. Same as rolling C. No direction D. Vertically downward

Q18: The angle made by the resultant of normal force and limiting friction with the normal is called:

A. Angle of repose B. Angle of contact C. Angle of friction D. Angle of incidence

Q19: In vacuum, friction is:

A. Zero B. Maximum C. Very high D. Equal to kinetic friction

Q20: Work done against friction is:

A. Negative B. Positive C. Zero D. Infinite