Methods of reducing friction

Question 1 Why is the surface of slide polished to make it smooth? Question 2 Name 2 lubricants? Question 3 Why do we sprinkle fine powder on carrom board? Question 4 Which force gets reduced when two surfaces in contact are polished to make them smooth? Question 5 State one way in which the friction…

Fluid friction

Question 1 What are fluids.Give example? Question 2 What is fluid friction? Question 3 What is the special name of frictional force exerted by fluids? Question 4 What is a streamlined shape? Question 5 Explain why a speedboat has a streamlined shape? Question 6 Why are cars, aeroplanes and rockets streamlines? Question 7 Give two…

Methods of increasing friction

Question 1 What is a groove? Question 2 What is a tread? Question 3 Why do gymnasts apply a coarse substance to their hands? Question 4 What is done to increase friction between the tyres and road? Question 5 Why do kabaddi players rub hands with dry soil? Question 6 Why grooves are made in…

Disadvantages of friction

Question 1 What makes the steps of foot over bridges at railway station to wear out slowly? Question 2 Which part wear away first in shoe?Give a reason for your answer? Question 3 Why do brake pads of bicycles have to be replaced quite often? Question 4 A pencil eraser loses tiny pieces of rubber…

Advantages of friction

Question 1 Why is it difficult to move on wet marble floor? Question 2 Why is it difficult to walk properly on a well polished floor? Question 3 What prevents you from slipping every time you take a step forward? Question 4 What enables us to fix nails in a wall and knots to be tied?…

Static, sliding and rolling friction

Question 1 What is sliding friction? Question 2 What is static friction? Question 3 What is rolling friction? Question 4 which type of friction comes into play when a book kept on cylindrical pencils is moving by pushing? Question 5 Explain why sliding friction is less than static friction? Question 6 Explain why rolling friction is…

Factors affecting friction

Question 1 On what factors does the friction depends? Question 2 Which will cause more friction: a rough surface or smooth surface? Question 3 Iqbal has to push a lighter box and seema has to push a similar heavy box on the same floor.Who will have to apply a larger force and why? Question 4…

Cause of friction

Question 1 Which type of surface produce least friction? Question 2 Which type of surface produce too much friction? Question 3 Name a device which is used to measure force acting on an object? Question 4 What is a spring balance? Question 5 Which will cause more friction:A rough surface or a smooth surface?Why? Question…

Friction

Question 1 Name the force which always opposes motion? Question 2 What is the direction of force of friction acting on moving object? Question 3 Define the term friction? Question 4 When we try to push a heavy box kept on ground it does not move at all.Which force is preventing this box to move…