Laws of Motion ...

Force F at a point in space (location of the particle) at a certain instant of time t is

In the arrangement shown in the figure below, the strings are light and inextensible. The surface over which the blocks are placed is smooth. What is the acceleration of each block?

Impulse is

A cyclist starts from the centre 'O' of a circular park of radius 1 km, reaches the edge 'P' of the park, then cycles along the circumference and returns to the centre along 'QO' as shown in the figure. If the round trip takes 10 minutes, the net displacement and average speed of the cyclist respectively (in m and km/hr) are

The force acting on a freely falling body in terms of mass m and acceleration due to gravity g is

Physical independence of force is a consequence of

The following figure is part of a horizontally stretched net. Section 'AB' is stretched with a force of 10 N. The tensions in the sections 'BC' and 'BF', respectively, are

For a body moving with constant speed in a horizontal circle, which of the following remains constant? 

A stone of mass 200 g is tied to the end of a 1 m long string. Holding the string at the other end, it is whirled in horizontal circles. If the speed of the stone is 10 m/s, calculate the centripetal force.

A particle revolves around a circular path. The acceleration of the particle is 

The first law of motion is also known as the law of 

When a force F acts on a body of mass m, the acceleration produced in the body is a. If three equal forces F₁ = F₂ = F₃ = F act on the same body as shown in the figure, then the acceleration produced is

A block moving on a surface with velocity 20 m/s comes to rest because of surface friction after covering a distance of 40 m. Taking g = 10 m/s², the coefficient of dynamic friction is:

Directions: The following question has four choices out of which ONLY ONE is correct.

If the velocity of a body is increased two times, then its momentum is

Directions: The following question has four choices out of which ONLY ONE is correct.

The rate of change of momentum is

Directions: The following question has four choices out of which ONLY ONE is correct.

If coefficient of static friction is µ_s, and coefficient of kinetic friction is µ_k then, which of the following expressions is correct?

Directions: The following question has four choices out of which ONLY ONE is correct.

A particle moves in a circle of radius 25 cm at the rate of two revolutions per second. The acceleration of particle is

Directions: The following question has four choices out of which ONLY ONE is correct.

The angular velocity of the hour hand of a watch is

Directions: The following question has four choices out of which ONLY ONE is correct.

mv²/r  is_________

If second law is applied to a rigid body

When a horse pulls a wagon, the force that causes the horse to move forward, is the force that

According to Newton's second law of motion, force is equal to 

A lift is moving downwards with an acceleration equal to acceleration due to gravity. A body of mass m kept on the floor of the lift is pulled horizontally. If the coefficient of friction is µ, then the frictional resistance offered by the body is

A student, unable to answer a question on Newton's laws of motion, attempted to pull himself up by tugging on his hair. He will not succeed as

The second law of motion is a vector law. It is equivalent to