Adevice that makes work easier by changing the size or direction of a force is called what?

Ineed the answers for these promblems i have

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? a. positive force, balanced force, negative force b. negative force, balanced force, positive force c. positive force, unbalanced force, negative force d. negative force, unbalanced force, positive force