Question

4 which of the following scenarios would best be represented by this free - body diagram? a a shopping cart is pushed with a rightward force, and accelerates to the right. b a shopping cart is pushed with a rightward force, and moves at a constant velocity. c a student is holding their backpack by one strap, motionless. d a book is sitting on a desk

Explanation:

Step1: Analyze free - body diagram

The diagram shows a normal force ($F_N$) acting upwards and a gravitational force ($F_g$) acting downwards on an object. There are no horizontal forces shown.

Step2: Evaluate each option

• Option A: A shopping cart pushed rightward with acceleration has a right - ward applied force and likely friction, which are not shown in the diagram.
• Option B: A shopping cart pushed rightward at constant velocity has a right - ward applied force and friction (if on a non - frictionless surface), which are not in the diagram.
• Option C: A student holding a backpack by one strap has tension in the strap in addition to gravity and normal force (if the student is standing on a surface), which is not shown in the diagram.
• Option D: A book sitting on a desk has a normal force from the desk acting upwards and the gravitational force acting downwards, which matches the free - body diagram.

Answer:

D. A book is sitting on a desk