What are the forces that resist motion that make Newton's 1st Law hard to completely visualize on Earth?

When applying kirchhoff's rules, one of the essential steps is to mark each resistor with plus and minus signs to label how the electric potential changes from one end of the resistor to the other. the circuit in the drawing contains four resistors, each marked with the associated plus and minus signs. however, one resistor is marked incorrectly. which one is it?

What do you think car designers do if the damage caused by a crash test is too severe?

Work = force × a. work b. energy c. distance d. momentum