Does a force cause motion or a change in motion

When objects are charged by they do not need to touch each other. a. friction b. induction c. conduction d. all of these

Plss anybody know how to do this? ? i need the answers from a through d

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)