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Newton’s Laws of Motion Physics - Newton’s Laws of Motion

Uttarakhand Board (UBSE) - STD 11 Science - Physics (Uttarakhand - English Medium). 82 questions in this chapter.

Question types

Newton’s Laws of Motion question types

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

82
Questions
6
Question groups
5
Question types
Sample Questions

Newton’s Laws of Motion 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
The force exerted by the floor of an elevator on the foot of a person standing there is more than the weight of the person if the elevator is:
  • A
    Going up and slowing down.
  • ✓
    Going up and speeding up.
  • C
    Going down and slowing down.
  • D
    Going down and speeding up.

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark
A block of mass $10\ kg$ is suspended through two light spring balances as shown in figure:
  • ✓
    Both the scales will read $10\ kg.$
  • B
    Both the scales will read $5\ kg.$
  • C
    The upper scale will read $10\ kg$ and the lower zero.
  • D
    The readings may be anything but their sum will he $10\ kg.$

Answer: A.

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Q 3M.C.Q (1 Marks)1 Mark
Three rigid rods are joined to form an equilateral triangle $\text{ABC}$ of side $1m.$ Three particles carrying charges $20\mu\text{C}$ each are attached to the vertices of the triangle. The whole system is at rest in an inertial frame. The resultant force on the charged particle at $A$ has the magnitude:
  • ✓
    Zero
  • B
    $3.6N$
  • C
    $3.6\sqrt{3}\text{N}$
  • D
    $7.2N.$

Answer: A.

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Q 4M.C.Q (1 Marks)1 Mark
A force $F_1$ acts on a particle so as to accelerate it from rest to a velocity $v$. The force $F_1$ is then replaced by $F_2$ which decelerates it to rest:
 
  • A
    $F_1$ must be equal to $F_2$.
  • ✓
    $F_1$ may be equal to $F_2$.
  • C
    $F_1$ must be unequal to $F_2$.
  • D
    None of these.

Answer: B.

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Q 5M.C.Q (1 Marks)1 Mark
A free ${}^{238}U$ nucleus kept in a train emits an alpha particle. When the train is stationary, a nucleus decays and a passenger measures that the separation between the alpha particle and the recoiling nucleus becomes $x$ at time $t$ after the decay. If the decay takes place while the train is moving at a uniform velocity $v,$ the distance between the alpha particle and the recoiling nucleus at a time $t$ after the decay as measured by the passenger is:
  • A
    $x + vt$
  • B
    $x - vt$
  • ✓
    $x$
  • D
    Depends on the direction of the train.

Answer: C.

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Q 61 Marks Question1 Mark
Consider a book lying on a table. The weight of the book and the normal force by the table on the book are equal in magnitude and opposite in direction. Is this an example of Newton's third law?
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Q 71 Marks Question1 Mark
An object is placed far away from all the objects that can exert force on it. A frame of reference is constructed by taking the origin and axes fixed in this object. Will the frame be necessarily inertial?
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Q 81 Marks Question1 Mark
Raindrops of radius 1mm and mass 4mg are falling with a speed of 30m/s on the head of a bald person. The drops splash on the head and come to rest. Assuming equivalently that the drops cover a distance equal to their radii on the head, estimate the force exerted by each drop on the head.
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Q 101 Marks Question1 Mark
Two blocks A and B of mass $m_A$ and $m_B$ respectively are kept in contact on a frictionless table. The experimenter pushes the block A from behind so that the blocks accelerate. If the block A exerts a force F on the block B, what is the force exerted by the experimenter on A?
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Q 112 Marks Questions2 Marks
A particle of mass 0.3kg is subjected to a force F = -kx with k = 15N/m. What will be its initial acceleration if it is released from a point x = 20cm?
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Q 132 Marks Questions2 Marks
A block of mass $0.2kg$ is suspended from the ceiling by a light string. A second block of mass $0.3kg$ is suspended from the first block through another string. Find the tensions in the two strings. Take $g = 10m/s^2$.
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Q 142 Marks Questions2 Marks
If you jump barefooted on a hard surface, your legs get injured. But they are not injured if you jump on a soft surface like sand or pillow. Explain.
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Q 152 Marks Questions2 Marks
A block of mass 2kg placed on a long frictionless horizontal table is pulled horizontally by a constant force F. It is found to move 10m in the first two seconds. Find the magnitude of F.
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Q 163 Marks Question3 Marks
A block of 2kg is suspended from the ceiling through a massless spring of spring constant k = 100N/m. What is the elongation of the spring? If another 1kg is added to the block, what would be the further elongation?
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Q 183 Marks Question3 Marks
A particle of mass $50g$ moves on a straight line. The variation of speed with time is shown in figure. Find the force acting on the particle at $t = 2, 4$ and $6$ seconds.
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Q 193 Marks Question3 Marks
A monkey of mass $15kg$ is climbing on a rope with one end fixed to the ceiling. If it wishes to go up with an acceleration of $1m/s^2$, how much force should it apply to the rope? If the rope is $5m$ long and the monkey starts from rest, how much time will it take to reach the ceiling?
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Q 203 Marks Question3 Marks
A force $\overrightarrow{\text{F}}=\overrightarrow{\text{v}}\times\overrightarrow{\text{A}}$ is exerted on a particle in addition to the force of gravity, where v is the velocity of the particle and $\overrightarrow{\text{A}}$ is a constant vector in the horizontal direction. With what minimum speed a particle of mass m be projected so that it continues to move undeflected with a constant velocity?
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Q 225 Marks Questions5 Marks
An empty plastic box of mass m is found to accelerate up at the rate of $\frac{\text{g}}{6}$ when placed deep inside water. How much sand should be put inside the box so that it may accelerate down at the rate of $\frac{\text{g}}{6}?$
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Q 235 Marks Questions5 Marks
The elevator shown in figure is descending with an acceleration of $2m/s^2$. The mass of the block A is 0.5kg. What force is exerted by the block A on the block B?
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Q 245 Marks Questions5 Marks
The monkey B shown in figure is holding on to the tail of the monkey A which is climbing up a rope. The masses of the monkeys A and B are 5kg and 2kg respectively. If A can tolerate a tension of 30N in its tail, what force should it apply on the rope in order to carry the monkey B with it? Take $g = 10m/s^2$​​​​​​​
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Q 255 Marks Questions5 Marks
The force of buoyancy exerted by the atmosphere on a balloon is B in the upward direction and remains constant. The force of air resistance on the balloon acts opposite to the direction of velocity and is proportional to it. The balloon carries a mass M and is found to fall down near the earth's surface with a constant velocity v. How much mass should be removed from the balloon so that it may rise with a constant velocity v?
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Q 26Case study (4 Marks)4 Marks
Two blocks of unequal masses are tied by a spring. The blocks are pulled stretching the spring slightly and the system is released on a frictionless horizontal platform. Are the forces due to the spring on the two blocks equal and opposite? If yes, is it an example of Newton's third law?
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Q 28Case study (4 Marks)4 Marks
In a TV picture tube electrons are ejected from the cathode with negligible speed and reach a velocity of $5 \times 10^6 \mathrm{~m} / \mathrm{s}$ in travelling one centimeter. Assuming straight line motion, find the constant force exerted on the electron. The mass of the electron is $9.1 \times 10^{-31} \mathrm{~kg}$.
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Q 29Case study (4 Marks)4 Marks
A plumb bob is hung from the ceiling of a train compartment. If the train moves with an acceleration 'a' along a straight horizontal track, the string supporting the bob makes an angle $\tan^{-1}\Big(\frac{\text{a}}{\text{g}}\Big)$ with the normal to the ceiling. Suppose the train moves on an inclined straight track with uniform velocity. If the angle of incline is $\tan^{-1}\Big(\frac{\text{a}}{\text{g}}\Big),$ the string again makes the same angle with the normal to the ceiling. Can a person sitting inside the compartment tell by looking at the plumb line whether the train is accelerated on a horizontal straight track or it is going on an incline? If yes, how? If no, suggest a method to do so.
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Q 30Case study (4 Marks)4 Marks
A man has fallen into a ditch of width d and two of his friends are slowly pulling him out using a light rope and two fixed pulleys as shown in figure. Show that the force (assumed equal for both the friends) exerted by each friend on the road increases as the man moves up. Find the force when the man is at a depth h.
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