Question

the dropdown is the sum of all the forces acting on an object.

frictional force
normal force
net force
air force

Explanation:

Step 1: Identify the definition of net force

The vector sum of all individual forces acting on an object is defined as the net force.

$$F_{\text{net}} = \sum F$$

Step 2: Evaluate the given options

• Frictional force is a resistive force opposing motion.
• Normal force is the perpendicular support force from a surface.
• Net force is the sum of all forces.
• Air force is a military branch, not a physical force.

Answer:

net force