What do you know about ionization energy electronegativity and atomic radius?? Please help!

Iwill give extra points to who gets this right

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d

Is a pencil falling to the floor anon contact force, a force, or a contact force