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Friction Physics - Friction

Rajasthan Board (RBSE) - STD 12 Science - Physics (Rajasthan - English Medium). 57 questions in this chapter.

Question types

Friction question types

57 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

57
Questions
6
Question groups
5
Question types
Sample Questions

Friction questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
Let $F, F_N$ and $f$ denote the magnitudes of the contact force, normal force and the friction exerted by one surface on the other kept in contact. If none of these is zero:
  • A
    $F > F_N$
  • B
    $F > f$
  • C
    $F_{N }> f$
  • ✓
    $F_N - f < F < F_{N }+ f$

Answer: D.

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Q 2M.C.Q (1 Marks)1 Mark
A boy of mass M is applying a horizontal force to slide a box of mass M' on a rough horizontal surface. The coefficient of friction between the shoes of the box and the floor is $\mu.$ In which of the following cases it is certainly not possible to slide the box?
  1. $\mu<\mu',\text{M < M}'$
  2. $\mu>\mu',\text{M < M}'$
  3. $\mu<\mu',\text{M > M}'$
  4. $\mu>\mu',\text{M > M}'$
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Q 3M.C.Q (1 Marks)1 Mark
While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure:
  1. Larger friction.
  2. Smaller friction.
  3. Larger normal force.
  4. Smaller normal force.
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Q 4M.C.Q (1 Marks)1 Mark
Two cars of unequal masses use similar tyres. If they are moving at the same initial speed, the minimum stopping distance:
  • A
    Is smaller for the heavier car.
  • B
    Is smaller for the lighter car.
  • ✓
    Is same for both cars.
  • D
    Depends on the volume of the car.

Answer: C.

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Q 5M.C.Q (1 Marks)1 Mark
In a situation the contact force by a rough horizontal surface on a body placed on it has constant magnitude. If the angle between this force and the vertical is decreased, the frictional force between the surface and the body will:
  1. Increase.
  2. Decrease.
  3. Remain the saint.
  4. May increase or decrease.
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Q 81 Marks Question1 Mark
Can you accelerate a car on a frictionless horizontal road by putting more petrol in the engine? Can you stop a car going on a frictionless horizontal road by applying brakes?
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Q 112 Marks Questions2 Marks
A block of mass 2kg is pushed against a rough vertical wall with a force of 40N, coefficient of static friction being 0.5. Another horizontal force of 15N, is applied on the block in a direction parallel to the wall. Will the block move? If yes, in which direction? If no, find the frictional force exerted by the wall on the block.
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Q 122 Marks Questions2 Marks
You are standing with your bag in your hands, on the ice in the middle of a pond. The ice is so slippery that it can offer no friction. How can you come out of the ice?
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Q 132 Marks Questions2 Marks
When two surfaces are polished, the friction coefficient between them decreases. But the friction coefficient increases and becomes very large if the surfaces are made highly smooth. Explain.
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Q 152 Marks Questions2 Marks
A body slipping on a rough horizontal plane moves with a deceleration of $4.0m/s^2$. What is the coefficient of kinetic friction between the block and the plane?
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Q 163 Marks Question3 Marks
A person $(40\ kg)$ is managing to be at rest between two vertical walls by pressing one wall A by his hands and feet and the other wall B by his back. Assume that the friction coefficient between his body and the walls is $0.8$ and that limiting friction acts at all the contacts.
  1. Show that the person pushes the two walls with equal force.
  2. Find the normal force exerted by either wall on the person. Take $g = 10m/s^2.$
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Q 173 Marks Question3 Marks
A block is projected along a rough horizontal road with a speed of 10m/s. If the coefficient of kinetic friction is 0.10, how far will it travel before coming to rest?
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Q 184 Marks Questions4 Marks
A car starts from rest on a half kilometer long bridge. The coefficient of friction between the tyre and the road is $1.0$. Show that one cannot drive through the bridge in less than $10s.$
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Q 194 Marks Questions4 Marks
The friction coefficient between an athelete's shoes and the ground is 0.90. Suppose a superman wears these shoes and races for 50m. There is no upper limit on his capacity of running at high speeds.
  1. Find the minimum time that he will have to take in completing the 50m starting from rest.
  2. Suppose he takes exactly this minimum time to complete the 50m, what minimum time will he take to stop?
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Q 204 Marks Questions4 Marks
In a children$-$park an inclined plane is constructed with an angle of incline $45^\circ$ in the middle part. Find the acceleration of a boy sliding on it if the friction coefficient between the cloth of the boy and the incline is $0.6$ and $g = 10m/s^2$.
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Q 214 Marks Questions4 Marks
A car is going at a speed of $21.6\ km/hr $ when it encounters a $12.8m$ long slope of angle $30^\circ$ . The friction coefficient between the road and the tyre is $\frac{1}{2\sqrt{3}}.$ Show that no matter how hard the driver applies the brakes, the car will reach the bottom with a speed greater than $36\ km/hr$. Take $g = 10m/s^2.$​​​​​​​
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Q 225 Marks Questions5 Marks
Suppose the block of the previous problem is pushed down the incline with a force of 4N. How far will the block move in the first two seconds after starting from rest? The mass of the block is 4kg.
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Q 235 Marks Questions5 Marks
Consider the situation shown in figure. Suppose a small electric field E exists in the space in the vertically upward direction and the upper block carries a positive charge Q on its top surface. The friction coefficient between the two blocks is g but the floor is smooth. What maximum horizontal force F can be applied without disturbing the equilibrium?
[Hint: The force on a charge Q by the electric field E is F = QE in the direction of E.]
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Q 245 Marks Questions5 Marks
A block of mass M is kept on a rough horizontal surface. The coefficient of static friction between the block and the surface is $\mu.$ The block is to be pulled by applying a force to it. What minimum force is needed to slide the block? In which direction should this force act?
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Q 255 Marks Questions5 Marks
Find the accelerations $a_1, a_2, a_3$ of the three blocks shown in figure if a horizontal force of $10N$ is applied on:
  1. $2\ kg$ block.
  2. $3\ kg$ block.
  3. $7\ kg$ block. Take $g = 10m/s^2.$
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