Question

how can inertia be described? *
objects dont start moving without an unbalanced force
object dont change their motion without an unbalanced force
objects dont stop moving without an unbalanced force
all of the above
the free - body diagram below represents the forces acting on an obje
how can the net force be determined?

Explanation:

First Question (How can inertia be described?):

Inertia is the tendency of an object to resist changes in its state of motion (either at rest or in uniform motion). Let's analyze each option:

• "Objects don't start moving without an unbalanced force": This is part of inertia (resisting starting motion), but not the full description.
• "Object don't change their motion without an unbalanced force": This is the core of inertia—objects resist changing their velocity (speed or direction) unless a net (unbalanced) force acts.
• "Objects don't stop moving without an unbalanced force": This is also part of inertia (resisting stopping motion), but not the full description.
• "All of the above": Since starting, stopping, or changing direction are all changes in motion, and inertia is the resistance to any change in motion, all the first three statements are aspects of inertia. Wait, but the selected option in the image is the second one, but let's re - evaluate. Wait, actually, the first option is about starting motion, the second about any motion change, the third about stopping. But the correct physics concept: Inertia is the resistance to a change in motion. So an object at rest resists starting (needs unbalanced force to start), an object in motion resists stopping or changing direction (needs unbalanced force to stop or turn). So all the first three are cases of "not changing motion" (starting is changing from rest to moving, stopping is changing from moving to rest, and changing direction is also a motion change). So the correct answer should be "All of the above". But the image has the second option selected, but maybe there's a typo (the second option has "Object" instead of "Objects"). However, based on physics, inertia means an object resists any change in its motion (starting, stopping, changing direction), so all the first three scenarios are due to inertia, so "All of the above" is correct. Wait, but let's check again. The first option: starting to move is a change in motion (from rest to moving), so needs unbalanced force. The second: changing motion (any change: speed or direction) needs unbalanced force. The third: stopping is a change in motion (from moving to rest), needs unbalanced force. So all three are correct, so "All of the above" is the right choice. But the image's selected option is the second one, maybe a mistake in the image. But according to physics, the correct answer is "All of the above".

Answer:

D. All of the above

Second Question (The free - body diagram question, but the diagram is partially visible. Assuming a typical free - body diagram with forces, say, if there are forces in different directions, the net force is the vector sum. But since the diagram is not fully visible, we can't solve it completely. However, for a free - body diagram, to find the net force, we sum the forces in each direction (e.g., horizontal and vertical) as vectors. If forces are in the same line, we add (or subtract if opposite) their magnitudes. For example, if there is a force \(F_1\) to the right and \(F_2\) to the left, net force is \(F_1 - F_2\) (if \(F_1>F_2\)) in the direction of \(F_1\). But without the full diagram, we can't give a numerical answer. If we assume the diagram has, say, a horizontal force \(F_H = 400N\) (from the visible part) and maybe a vertical force, but since it's cut off, we can't proceed. If it's a single horizontal force, the net force is equal to that force. But more information is needed.