subject

Friction

Physics ⇒ Mechanics

Friction starts at 8 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Friction. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 9
A 10 kg box is resting on a horizontal surface. If the coefficient of static friction is 0.5, what is the maximum static frictional force? (Take g = 10 m/s²)
A 2 kg book is lying on a table. If the coefficient of friction between the book and the table is 0.3, what is the frictional force? (Take g = 10 m/s²)
A 5 kg object is pulled with a force of 30 N on a horizontal surface. If the frictional force is 10 N, what is the net force acting on the object?
A block is pushed across a table and comes to a stop. What force is responsible for stopping the block?
A box is at rest on a horizontal surface. Which type of friction prevents it from moving when a small force is applied?
A car skids more on a wet road than on a dry road. Explain why.
Calculate the frictional force if the coefficient of friction is 0.4 and the normal force is 50 N.
Describe how friction helps in lighting a matchstick.
Describe one advantage and one disadvantage of friction.
Explain why ball bearings are used in machines.
Explain why it is difficult to walk on a wet floor.
Explain why it is easier to move a heavy box on wheels than to slide it across the floor.
Explain why oil is applied to the moving parts of machines.
Explain why soles of shoes are made rough.
State one way in which friction is harmful.
State the SI unit of the coefficient of friction.
What is friction?
A 15 kg crate is being pulled across a rough floor with a constant velocity by a horizontal force of 45 N. What is the coefficient of kinetic friction between the crate and the floor? (Take g = 10 m/s²)
A 20 kg suitcase is dragged at a constant speed across a hotel lobby floor. If the coefficient of kinetic friction is 0.25, calculate the force required to keep the suitcase moving. (Take g = 10 m/s²)
A block is placed on an inclined plane. As the angle of inclination increases, the block starts to slide. Explain why this happens in terms of frictional forces.