- ADynamics
- BKinematics
- CMechanics
- DKinetics
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Mechanics is the branch of physics that deals with the effect of force on bodies..
Kinematics is the branch of mechanics that deals with the motion of bodies without considering the cause of motion.
Inertia of direction refers to the resistance of a body to change its direction of motion. Therefore, option D) is the correct answer..
An external force is a force that comes from outside the object or system in question. Gravity and inertia are internal forces, while friction is a force that opposes motion but is still internal to the system. Only a push or pull from an external source can be considered an external force.)
Force is an external effort in the form of push or pull that produces or tries to produce the motion of a static body, stops or tries to stop a moving body, or changes or tries to change the direction of motion of a moving body.
A couple is defined as two equal and unlike parallel forces applied simultaneously at two distinct points, which do not produce any translatory motion but cause the rotation of the body. Turning a tap involves two equal and opposite forces applied at different points, which results in the rotation of the tap.