Question

forces that change motion quick check
suppose a man is sitting on a chair and exerting 100 n of force downward, while a spring beneath the chair exerts 150 n of force upward. if you assign a negative value to the downward force, what is the net force of this system? (1 point)
○ 50 kg
○ 50 n
○ -50 n
○ 250 n

Explanation:

Step1: Define forces with signs

Downward force (man) is -100 N (negative as per assignment), upward force (spring) is +150 N (positive for upward).

Step2: Calculate net force

Net force = Upward force + Downward force = \( 150 + (-100) \)
\( 150 - 100 = 50 \) N (positive sign indicates upward direction, magnitude 50 N).

Answer:

50 N