(i) Yes, it is possible. Two equal & opposite forces are required to produce required amount of torque. Two fingers can be used.
(ii) Rotational motion produced by a single finger is less than two fingers producing equal & opposite forces

(i) Is the branch of physics that deals with the effect of force on objects.
(ii) It is divided into two branches, namely, statics and dynamics.
(iii) Statics deals with the objects which are at rest and dynamics deals with the moving objects under the action of forces.

A large force acting for a very short interval of time is called as 'Impulsive force'. When a force F acts on a body for a period of time t, then the product of force and time is known as 'impulse' represented by 'J'.

(i) If a force acting on a body of mass. 1 gram produces an acceleration of 1 cm s^-2, then the force is said to be 1 dyne.
(ii) 1 dyne = 1g cm s^-2, 1N = 10⁵ dyne

(i) By convention, direction of moment of a force or couple is taken as positive if the object is rotated in anti-clockwise direction.
(ii) It is negative if it rotates the object in clock wise direction.

(i) It is measured by the product of anyone of the forces (F) and the perpendicular distance between two forces (d). ፒ = F x d.
(ii) The turning effect of couple is measured by the magnitude of its moment.
(iii) Moment of the couple = Force x perpendicular distance between the force = F x S.
(iv) The unit of moment of the couple is newton meter (Nm).

(i) The system can be brought to equilibrium by applying another force which is equal to the resultant force in magnitude but opposite in direction.
(ii) Such a force is called as "Equilibrant".

(i) According to Aristotle, A moving object naturally comes to rest without any external influence or force. Such motions are termed as "natural motion".
(ii) Natural motion is an unforced motion. According to Newtonian mechanics, the natural motion is a uniform rectilinear motion, following its first law of motion. In general relatively, a natural motion may be linear or curved.

(i) It is divided into two branches, namely, statics and dynamics.
(ii) Statics: It deals with the objects which are at rest under the action of forces.
(iii) Dynamics: It is the study of moving objects under the action of forces. Dynamics is further divided as follows:
(a) Kinematics: It deals with the motion of bodies without considering the cause of motion.
(b) Kinetics: It deals with the motion of bodies considering the cause of motion.

(i) Catching a cricket ball the fielder lowers his hands backwards. Because, he stops his hands soon after catching the ball, the ball comes to rest very quickly.
(ii) It means that the momentum of the ball is brought to rest very quickly.
(iii) So the average force acting on the body will be large.
(iv) Due to this large average force, the hands will get hurt.
(v) To avoid getting hurt, the player brings the ball to rest slowly.

(i) A spanner has a long handle to produce a larger moment of force by a small force applied normally at the end of its handle.
(ii) Moment of force = \(\overrightarrow{\mathbf{F}} \times \overrightarrow{\mathrm{d}}\)

(i) The rotating effect of a couple is known as moment of a couple.
(ii) Eg: Turning a tap, winding or unwinding a screw, spinning of a top, etc...
(iii) Moment of a couple = Force x perpendicular distance between the line of action of force.
(iv) M = F x S

The inherent property of a body to resist any change in its state of rest or the state of uniform motion, unless it is influenced upon by an external unbalanced force is known as 'inertia'.
Types:
(i) Inertia of rest
(ii) Inertia of motion
(iii) Inertia of direction

Recoil velocity of a gun α\(\frac { 1 }{ m } \). So light rifle recoils with large velocity than the heavy rifle.