Question

Why does an object in motion stay in motion unless acted on by an unbalanced force?











A) because forces are what stop and start motion


B) because balanced forces can not exist in nature


C) because motion is the inherent state of all matter


D) because motion, once begun, continues to accelerate

Answer 1

Answer: A) because forces are what stop and start motion

Explanation:

From Newton's first law, an object tends to stay in state of rest or motion unless acted upon by an unbalanced external force. This is also known law of inertia. This is because a force can stop or start a motion. A force cause body to accelerate to decelerate otherwise the body continues with constant speed.

Answer 2

An object in motion stays in motion unless acted on by an unbalanced force A) because forces are what stop and start motion

Further explanation

In Newton's first law, it is stated that if the resultant force acts on an object of magnitude is zero, it can be formulated:

$\large{\boxed{\bold{\sum F=0}}$

 then the object tends to defend itself from its state.

or can be stated:

An object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force.

So for objects in a state of movement, objects tend to move forever. Likewise, for objects in a state of rest, they tend to remain forever. The tendency of objects like this is called inertia

The size of inertia is proportional to mass, the greater the mass of the object, the greater the inertia of the object.

In objects with mass that move translatively, the object will maintain its linear velocity

Forces are balanced when all the forces act upon an object balance with each other

Forces are unbalanced when there is an individual force that is not being balanced by another force

So the object in balanced forces:

• 1. object at rest v = 0, a = 0

• 2. object at motion v ≠0, a = 0

Let see the answer choices

• A) because forces are what stop and start motion

If there is an unbalanced force, the object will tend to move from the rest position or the object changes its state of motion.

Statement is true

• B) because balanced forces can not exist in nature

Balanced forces can exist in nature for example. For example a person standing on the floor. There are two forces. The force of gravity and the floor for upward force, thus the person maintains its state (rest motion). So this condition is called a state of balance or balance.

Statement is false

• C) because motion is the inherent state of all matter

All matter is not only in a state of movement but also in a position of rest

Statement is false

• D) because motion, once begun, continues to accelerate

motion of object can accelerate or decelerate

Statement is false

Learn more

Newton's law of inertia

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example of Newton's First Law of inertia

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law of motion

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Keywords: inertia, Newton's First Law