Two surfaces A and B have a static friction of 100 N. Which of the following can be the sliding friction between A and B?

A porter is pushing a big suitcase on the ground from north to south direction. The force of friction due to ground will act on this big suitcase towards ______.

Which of the following can be measured with a spring balance?

a. Weight of an object b. Density of an object c. Mass of an object d. Force acting on an object

The friction between two surfaces depends on which of the following factors?

a. The force of gravity of Earth. b. The smoothness or roughness of the two surfaces. c. The force with which the two surfaces are pressed together.

Which of the following statements is/are false?

a. The interlocking of irregularities of the two surfaces opposes the motion of one object over the other and gives rise to force of friction. b. Vehicles are able to move on road because of the presence of friction between their tyres and the surface of road. c. Cars and speedboats are streamlined to increase drag.

Which of the following should be applied to a carrom board to reduce friction?

Which of the following will produce maximum friction?

What will be the magnitude of the friction force on an object when it just starts moving?

a. Sliding friction b. Rolling friction c. The maximum value of static friction

If static friction between two surfaces is 10 N, then the rolling friction between these two surfaces will most likely be

The magnitude of drag exerted by a fluid on an object does not depend on which of the following factors?

Five similar cars A, B, C, D and E, having the same mass, were running at the same speed on the same road when brakes were applied. All the cars came to a stop after covering distances of 7 m, 9 m, 12 m, 14 m and 17 m, respectively. In which of the following cars was the friction between the brake pads and discs the minimum?

Which of the following statements is/are false?

a. It is easier to hold an earthen pot in our hand than a glass tumbler. b. Higher the viscosity of fluid, lesser will be the drag action on an object moving through it. c. Applying oil helps in avoiding interlocking between two surfaces to a large extent.

In cases where friction is useful, one wants to increase it. Which of the following is not a method to increase friction?

In most of the machines, friction is reduced by using ball bearings. Ball bearings convert

Which of the following statements is/are false?

a. It is easier to move an object by sliding than by keeping it on rollers. b. Friction can be reduced but not eliminated completely. c. Fluid friction reduces the speed of the objects moving through a fluid.