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3 years ago

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

Physics

2 answers:

Svet_ta [14]3 years ago

7 0

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.

BartSMP [9]3 years ago

4 0

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

<h3>Further explanation </h3>

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:

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

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<u> inertia </u>

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

<u>Forces are balanced</u> when all the forces act upon an object balance with each other

<u>Forces are unbalanced</u> 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

<h3>Learn more </h3>

Newton's law of inertia

brainly.com/question/1412777

example of Newton's First Law of inertia

brainly.com/question/1090504

law of motion

brainly.com/question/75210

Keywords: inertia, Newton's First Law

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Answer:

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Explanation:

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3 years ago

The exit nozzle in a jet engine receives air at 1200 K, 150 kPa with negligible kinetic energy. The exit pressure is 80 kPa, and

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Complete question:

The exit nozzle in a jet engine receives air at 1200 K, 150 kPa with negligible kinetic energy. The exit pressure is 80 kPa, and the process is reversible and adiabatic. Use constant specific heat at 300 K to find the exit velocity.

Answer:

The exit velocity is 629.41 m/s

Explanation:

Given;

initial temperature, T₁ = 1200K

initial pressure, P₁ = 150 kPa

final pressure, P₂ = 80 kPa

specific heat at 300 K, Cp = 1004 J/kgK

k = 1.4

Calculate final temperature;

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k = 1.4

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Work done is given as;

$W = \frac{1}{2} *m*(v_i^2 - v_e^2)$

inlet velocity is negligible;

$v_e = \sqrt{\frac{2W}{m} } = \sqrt{2*C_p(T_1-T_2)} \\\\v_e = \sqrt{2*1004(1200-1002.714)}\\\\v_e = \sqrt{396150.288} \\\\v_e = 629.41 \ m/s$

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Answer:

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castortr0y [4]

Explanation:

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