Samacheer Kalvi solutions for Physics - Volume 1 and 2 [English] Class 11 TN Board chapter 3 - Laws of motion [Latest edition]

When a car takes a sudden left turn in the curved road, passengers are pushed towards the right due to ______

An object of mass m held against a vertical wall by applying horizontal force F as shown in the figure. The minimum value of the force F is ______

A vehicle is moving along the positive x-direction, if a sudden brake is applied, then ______

A book is at rest on the table which exerts a normal force on the book. If this force is considered a reaction force, what is the action force according to Newton’s third law?

Two masses m₁ and m₂ are experiencing the same force where m₁ < m₂. The ratio of their acceleration `a_1/a_2` is ______

Choose an appropriate free body diagram for the particle experiencing net acceleration along the negative y-direction. (Each arrow mark represents the force acting on the system).

A particle of mass m sliding on the smooth double inclined plane (shown in the figure) will experience ______

Two blocks of masses m and 2m are placed on a smooth horizontal surface as shown. In the first case, only a force F₁ is applied from the left. Later only a force F₂ is applied from the right. If the force acting at the interface of the two blocks in the two cases is the same, then F₁ : F₂ is ______

Force acting on the particle moving with constant speed is ______

An object of mass m begins to move on the plane inclined at an angle θ. The coefficient of static friction of inclined surfaces is µ_s. The maximum static friction experienced by the mass is ______

When the object is moving at a constant velocity on the rough surface, ______

When an object is at rest on the inclined rough surface, ______

The centrifugal force appears to exist ______

Choose the correct statement from the following.

If a person moving from pole to equator, the centrifugal force acting on him ______

Explain the concept of inertia. Write two examples each for the inertia of motion, the inertia of rest, and inertia of direction.

State Newton’s second law.

Define one newton.

Show that impulse is the change of momentum.

Using a free body diagram, show that it is easy to pull an object than to push it.

Explain various types of friction.

Suggest a few methods to reduce friction.

What is the meaning of ‘pseudo force’?

State the empirical laws of static and kinetic friction.

State Newton’s third law.

What are inertial frames?

Under what condition will a car skid on a leveled circular road?

Prove the law of conservation of linear momentum. Use it to find the recoil velocity of a gun when a bullet is fired from it.

What are concurrent forces?

State Lami’s theorem.

Explain the motion of blocks connected by a string in (i) Vertical motion (ii) Horizontal motion.

Briefly explain the origin of friction. Show that in an inclined plane, the angle of friction is equal to the angle of repose.

State Newton’s three laws and discuss their significance.

Explain the similarities and differences of centripetal and centrifugal forces.

Briefly explain ‘centrifugal force’ with suitable examples.

Briefly explain ‘rolling friction.'

Explain the need for banking of tracks.

Calculate the centripetal acceleration of the Moon towards the Earth.

A force of 50N acts on the object of mass of 20 kg. shown in the figure. Calculate the acceleration of the object in x and y directions.

A spider of mass 50 g is hanging on a string of a cobweb as shown in the figure. What is the tension in the string?

What is the reading shown in spring balance?

The physics books are stacked on each other in the sequence: +1 volumes 1 and 2; +2 volumes 1 and 2 on a table.

a) Identify the forces acting on each book and draw the free body diagram.

b) Identify the forces exerted by each book on the other.

A bob attached to the string oscillates back and forth. Resolve the forces acting on the bob into components. What is the acceleration experienced by the bob at an angle θ?

Two masses m₁ and m₂ are connected with a string passing over a frictionless pulley fixed at the comer of the table as shown in the figure. The coefficient of static friction of mass m₁ with the table is µ_s Calculate the minimum mass m₃ that may be placed on m₁ to prevent it from sliding. Check if m₁ = 15 kg, m₂ = 10 kg, m₃ = 25 and µ_s = 0.2.

Calculate the acceleration of the bicycle of mass 25 kg as shown in Figures 1 and 2.

Apply Lami’s theorem on the slingshot and calculate the tension in each string?

A football player kicks a 0.8 kg ball and imparts it a velocity of 12 ms^-1. The contact between the foot and ball is only for one-sixtieth of a second. Find the average kicking force.

A stone of mass 2 kg is attached to a string of length 1 meter. The string can withstand a maximum tension of 200 N. What is the maximum speed that stone can have during the whirling motion?

Imagine that the gravitational force between Earth and Moon is provided by an invisible string that exists between the Moon and Earth. What is the tension that exists in this invisible string due to Earth’s centripetal force? (Mass of the Moon = 7.34 × 10²² kg, Distance between Moon and Earth = 3.84 × 10⁸ m)

Two bodies of masses 15 kg and 10 kg are connected with light string kept on a smooth surface. A horizontal force F=500 N is applied to a 15 kg as shown in the figure. Calculate the tension acting in the string?

People often say “For every action, there is an equivalent opposite reaction”. Here they meant ‘action of a human’. Is it correct to apply Newton’s third law to human actions? What is mean by ‘action’ in Newton's third law? Give your arguments based on Newton’s laws.

A car takes a turn with a velocity of 50 ms^-1 on the circular road of a radius of curvature of 10 m. calculate the centrifugal force experienced by a person of mass 60 kg inside the car?

A long stick rests on the surface. A person standing 10 m away from the stick. With what minimum speed an object of mass 0.5 kg should he has thrown so that it hits the stick. (Assume the coefficient of kinetic friction is 0.7).