Work done = force x distance = 40 x 2 = 80 Joules.
When the car speeds up, slows down, or goes around a curve,
passengers need a force applied to them to make them do the
same thing, otherwise they won't keep up with the car.
The force on the passenger is applied by means of friction between
the upholstery and the seat of his pants, and also by the seat-back
or his seat-belt.
the higher concentration of molecules, the faster a reaction can occur
Move the objects faster to get more friction.
