Question

5.12 exam: semester 1 exam which of these boxes will not accelerate?

Explanation:

Step1: Check net force for acceleration

Acceleration requires non-zero net force (Newton's 1st law).

Step2: Analyze Box A

Assumed single force (15 N downward). Net force = 15 N ≠ 0 → accelerates.

Step3: Analyze Box B

Upward 30 N, downward 40 N. Net force = 40 - 30 = 10 N ≠ 0 → accelerates.

Step4: Analyze Box C

Right 20 N, left 20 N. Net force = 20 - 20 = 0 N → no acceleration.

Answer:

C. Box C