Question

what does Newton's 1 law of motion states​

Answer 1

Answer:

Newton’s laws of motion, relations between the forces acting on a body and the motion of the body, first formulated by English physicist and mathematician Sir Isaac Newton.

Newton’s first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force. This postulate is known as the law of inertia. The law of inertia was first formulated by Galileo Galilei for horizontal motion on Earth and was later generalized by René Descartes. Before Galileo it had been thought that all horizontal motion required a direct cause, but Galileo deduced from his experiments that a body in motion would remain in motion unless a force (such as friction) caused it to come to rest.

Explanation:

Hope this helps you.

Folow me plz

Answer 2

Newton's law of motion:

→ Newton's law of motion - Newton is the father of physics and he established the laws of motion in his book named Principia in the year 1667. There are three Newton's law of motion.

Newton's first law of motion:

→ Every body maintain it's initial state of rest or motion with uniform speed on straight line unless an external force act on it. In short, an object continuous to be in a state of rest or of uniform motion along a straight line unless acted upon by an unbalanced force.

◆ It's also known to be law of Galileo or law of inertia.

♛ Law of inertia = It is the property of a body by virtue of which the body opposes change in it's initial state of rest or motion with uniform speed on a straight line.

There are 2 types of inertia:

⑴ Inertia of rest

⑵ Inertia of motion

Some examples of inertia:

⑴ When a coat /blanket is beaten by a stick the dust particles are removed.

⑵ When a car start suddenly the passenger bends backwards.

Additional information:

Newton's 2nd law of motion:

→ The rate of change in momentum of a body is directly proportional to the applied force on the body and take place in the direction of force.

If F = force applied ; a = acceleration produced and m = mass of body then Force = Mass × Acceleration

◆ Newton's second law gives the magnitude of force.

◆ Newton's first law is contained in the second law.

♛ Force - It is that external cause which when acts on a body changes or tries to change the initial state of the body.

♛ Momentum - It is that property of a moving body and is defined of mass and velocity of the body. It's a vector quantity. SI unit is kg m/s.

$\: \: \: \: \: \: \:{\bf{Momentum = \: Mass \times Velocity}} \: \: \: \: \green\star$

F = ma that is Newton's second law of motion, where F is the force exert on a body, m is the mass and a is the acceleration.

Let us derive this formula!

According to the statement, let us assume that an object of mass m is moving in a straight line with an initial velocity u. Afterwards it is accelerated(uniformly) to the final velocity v and take time t. Now the constant force F is applied through the time t. The initial and final momentum of the object will be ${\sf{p_1}}$ as mu and the ${\sf{p_2}}$ mv

Knowledge required: p = m × v i.e., Momentum = Mass × Velocity

The change in momentum

⠀⠀⠀⠀⠀⠀∝ ${\sf{p_2 \: - p_1}}$

⠀⠀⠀⠀⠀⠀∝ ${\sf{mv \: - mu}}$

⠀⠀⠀⠀⠀⠀∝ ${\sf{m(v-u)}}$

The rate of change of momentum

⠀⠀⠀⠀⠀⠀∝ ${\sf{\dfrac{m(v-u)}{t}}}$

Or when the force applied

⠀⠀⠀⠀⠀F ∝ ${\sf{\dfrac{m(v-u)}{t}}}$

⠀⠀⠀⠀⠀F = ${\sf{\dfrac{km(v-u)}{t}}}$

⠀⠀⠀⠀⠀⠀= kma

We write a at the place of ${\sf{\dfrac{(v-u)}{t}}}$ because of the formula of acceleration. Here, k is constant proportional.

⠀⠀⠀⠀⠀We already know that mass and acceleration have SI units as kg and m/s² respectively. So we can make the SI unit of force by using there two SI units.

⠀⠀⠀⠀⠀⠀⠀⠀⠀The unit of force is so chosen then k became one.

⠀⠀⠀⠀Knowledge required: The one unit of the force is defined as the the amount that produces an acceleration of 1 m/s² in an object of 1 kg mass. Therefore,

↪️ 1 unit of force = k(1 kg)(1 m/s²)

↪️ 1 unit of force = 1(1 kg)(1 m/s²)

↪️ F = kma

↪️ F = 1ma

↪️ F = ma Henceforth, proved!

Newton's 3rd law of motion:

→ Every action is equal to every reaction but in opposite direction. In short, To every action, there is an equal and opposite reaction and they act on the two different bodies.

Some examples -

⑴ Motion of the rocket.

⑵ Recoil of the gun.

__________________________

Justification: Hey dear user, *I have firstly answer this question on about 18 June 2021! I am saying this because you had asked question and I answer it within 4 to 5 minutes that is literally not possible to type like this within 4.5 minutes. Thank you!