Effect of Normal Force on Friction

Q. Question 9
Two blocks of iron of different masses are kept on a cemented floor as shown in the figure. Which one of them would require a larger force to move it from the rest position?

Q. Four boxes are labelled P, Q, and R. Box P is placed on a grass field, box Q is placed on a marble floor, and box R and S are placed on a wet marble floor. Which of the following boxes will require the minimum force to move?

1. 
   Box P
2. 
   Box Q
3. 
   Box R
4. 
   Box S

Q. Friction depends on
(i) normal force on the object
(ii) roughness
(iii) area of contact
Choose the correct one

1. Only (i) is correct
2. Only (ii) is correct
3. Only(iii) is correct
4. Both (i) and (ii) are correct

Q. On which three factors does friction depends to move a stationary object

Q. A box of mass 8 kg is placed on a rough inclined plane of inclination theta. Its downward motion can be prevented by applying an upward pull F and it can be mad to slide upwards by applying a force of 2F. Find the coefficient of friction between the box and inclined plane.

Q. You are holding a block 'A' with your palms. Each of your palm is giving, F = 12 N force to the block as shown in the figure. The weight of the block is W = 8 N. The block is not sliding. So the frictional force on the block by each of your palm will be _________.

1. 12 N
2. 4 N
3. 8 N
4. 20 N

Q. 14. A boy of mass 40 kg is climbing a vertical pole at a constant speed. If the coefficient of friction between his palms and the pole is 0.8 andg 10 m/s" , the horizontal force that he is applying on the pole is(a)300N b) 400 N (d) 600 N (c) 500 N

Q. Question 9
Two blocks of iron of different masses are kept on a cemented floor as shown in the figure. Which one of them would require a larger force to move it from the rest position?

Q. Friction depends on
(i) normal force on the object
(ii) roughness
(iii) area of contact
Choose the correct one

1. Only (i) is correct
2. Only (ii) is correct
3. Only(iii) is correct
4. Both (i) and (ii) are correct

Q. 20. A pot of mass 1 kg is raised vertically at a constant velocity, by holding it firmly with both hands. Coefficient of friction between the hands and the pot is 0 2. What is the force applied by each hand?

Q. Alex runs his toy car on a dry marble floor, wet marble floor, and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be:

1. Dry marble floor, wet marble floor, towel
2. Towel, dry marble floor, wet marble floor
3. Towel, wet marble floor, dry marble floor
4. Wet marble floor, dry marble floor, towel

Q. Which of the following blocks will not experience any frictional force on application of external force(s) on it?

1. 
2. 
3. 
4. 

Q. A person is balancing between two walls. Identify the direction of friction at the point of contact

1. 
2. 
3. 
4. 

Q. A person is balancing between two walls. Identify the direction of friction at the point of contact

1. 
2. 
3. 
4. 

Q. Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
[2 marks]
[Exemplar]
[Factors affecting friction]

Q. Which one of the following actions makes it easier to move your LPG cylinder from one place to another?

1. Lifting the cylinder
   
2. Rolling the cylinder
   
3. Moving the cylinder on the floor by pushing
   
4. Moving the cylinder on the floor by pulling
   

Q. A person is balancing between two walls. Identify the direction of friction at the point of contact

1. 
2. 
3. 
4. 

Q.

If the girl's team is winning who is appyling a greater force.?

Q. Two blocks of iron of different weights are kept on a cemented floor as shown in the figure. Which one of them would require a larger force to move it from the rest position?

1. Object A requires larger force.
2. Object B requires larger force.
3. Both object A and object B require same force which is not zero.
4. Both object A and object B require same force which is zero.

Q.

Neha has to push a light box and Sohit has to push a comparatively heavier box made of same material, on the same horizontal floor. What can we say about the forces applied by them?

1. Both will have to apply the same amount of force.

2. Neha will have to apply a larger force.

3. Sohit will have to apply a larger force.

4. Both of them don't need to apply any force to move the box.

Q.

Fill in the blanks with missing words:

The maximum value of the force of friction is called ________ friction.

Q. Which of the following blocks will not experience any frictional force on application of external force(s) on it?

1. 
2. 
3. 
4. 

Q. Which one of the following actions makes it easier to move your LPG cylinder from one place to another?

1. Lifting the cylinder
   
2. Rolling the cylinder
   
3. Moving the cylinder on the floor by pushing
   
4. Moving the cylinder on the floor by pulling
   

Q. If normal force on any object is doubled then frictional force on this object ___________

1. will not change
2. cannot be predicted
3. will be doubled
4. will be exactly half

Q.

A cube is pushed in such a way that it is sliding on a horizontal surface. Frictional force acting on the cube can be increased by:

1. Placing another identical cube on top of the cube.

2. Adding wheels to the cube.

3. Applying lubricant between the cube and the surface.

4. Polishing the outer surface of the cube.

Q. A person is balancing between two walls. Identify the direction of friction at the point of contact

1. 
2. 
3. 
4. 

Q. Greater the weight of an object, greater will be the friction between the object and the surface on which the object is kept.

1. True
2. False

Q. A stationary block remains stationary even after applying a horizontal force. This means that frictional force is applied force.

1. equal to
2. greater than
3. less than