Explain primary concept of force.
What are concurrent forces ? Explain equilibrium of particle under effect of concurrent forces.
The ends of a rope are held by two men who pulls on it with equal and opposite forces of magnitude $F$ each. Then the tension in the rope is
Give the magnitude and direction of the net force acting on
$(a)$ a drop of rain falling down with a constant speed,
$(b)$ a cork of mass $10\; g$ floating on water,
$(c)$ a kite skillfully held stationary in the sky,
$(d)$ a car moving with a constant velocity of $30\; km/h$ on a rough road,
$(e)$ a high-speed electron in space far from all material objects, and free of electric and magnetic fields.