Question 9 of 10 • TX-Integrated Physics and Chemistry
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. (The direction of the force of gravity is negative.)
Answer
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