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Schach [20]
3 years ago
15

Define Laws of motion

Physics
2 answers:
Dmitriy789 [7]3 years ago
8 0

Answer:

Explanation:

NEWTON'S FIRST LAW OF MOTION:

a body continues its state of rest or of uniform motion in a straight line provided no net force acts on it. Fnet=0

NEWTON'S SECOND LAW OF MOTION:

when a net force acts on a body it produces acceleration in the body which is directly proportional to the magnitude of the net force and inversely to the mass of the body.F=ma

NEWTON'S THIRD LAW OF MOTION:

to every action there is always an equal but opposite reaction.

Vika [28.1K]3 years ago
8 0

<u>Answer</u>:

<h3>Newton's laws of motion are three physical laws that, together, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces.</h3>

<em><u>Newton’s laws of motion can be summarized as follows:</u></em>

An object will remain at rest, or in a uniform, straight-line motion if moving, unless an external force acts upon it.

Force equals change in momentum per change in time. For an object with constant mass, force equals mass times acceleration.

For every action, there is an equal and opposite reaction.

<u>In Depth</u>:

<h2>Newton’s First Law: Inertia</h2>

A rock resting on level ground won’t suddenly start moving unless you push it. This is Newton’s first law, which introduces the principle of inertia. Inertia tells us that objects at rest stay at rest, and objects in motion stay in motion at a constant velocity (speed in one direction). When a force acts on the object, it changes its behavior.

For example, when you push the rock along the ground, you apply an external force that causes the rock to break out of inertia and begin moving. When you throw the rock through the air, the force of gravity acts upon it and slows it down, pulling it back to earth. If you threw that rock in outer space with no external force of gravity acting upon it, the flying rock would travel indefinitely forward at constant velocity because of inertia.

<h2>Newton’s Second Law: Changes in Motion</h2>

Force (F) equals mass (m) times acceleration (a). An object’s mass is the amount of matter it contains. An object’s acceleration is its change in velocity—whether the object is speeding up or slowing down as it moves.

If this seems complicated, just think about how everyday objects react to force. It’s easier to push a soccer ball a certain distance than it is to push a car that same distance. That’s because the soccer ball has much less mass than the car, so it requires less force to create the same amount of acceleration.

<h2>Newton’s Third Law: Action and Reaction</h2>

A rocket has to fire its engines forcefully to overcome gravity and propel itself into outer space. The force of gas propelling downwards creates a reaction that pushes the rocket in the opposite direction with equal force. This is Newton’s third law: every action has an equal and opposite reaction.

As a result of Newton’s third law, all forces come in pairs. When you push against solid ground with your foot, the ground doesn’t fly off —it pushes back against you. This law helps us understand how objects with different forces interact.

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Which phrases describe all the outer planets’ motion? Select two options.
AysviL [449]

Answer:

Fast rotation

Slow revolution

Explanation:

Solar system has 8 planets. 4 inner rocky planets - Mercury, Venus, Earth and Mars and 4 outer gaseous planets - Jupiter, Saturn, Uranus and Neptune.  The outer planets have few common features.

They are gaseous. There  period of revolution is larger than the inner planets which means that they have slow revolution about the Sun. One day on the outer planets is smaller than the inner planets which means they have fast rotation.

For example, Jupiter has revolves around sun in 11.86 Earth years and rotates about axis in 9.8 Earth hours. Uranus revolves around sun in 84 Earth years and rotates on its axis 17.9 Earth hours.

8 0
3 years ago
Read 2 more answers
1. John has to hit a bottle with a ball to win a prize. He throws a 0.4 kg ball with a velocity of 18 m/s. It hits a 0.2 kg bott
Kobotan [32]
 0.4 x 18 = 7.2 kg m/s

The momentum of the bottle after being hit is 0.2 x 25 = 5 kg m/s

7.2 - 5 = 2.2 kg m/s is the motmentum of the ball now 

 the velocity  is 2.2/0.4 = 5.5 m/s
7 0
3 years ago
(b) Can the speed of a rocket exceed the exhaust speed of the fuel? Explain.
muminat

<u>Yes. The speed of a rocket can exceed the exhaust speed of the fuel.</u>

How this is explained?

  • The thrust of the rocket does not depend on the relative speed of the gases or the relative speed of the rocket.
  • It depends on conservation of momentum.

What is conservation of momentum?

  • Conservation of momentum, general law of physics according to which the quantity called momentum that characterizes motion never changes in an isolated collection of objects; that is, the total momentum of a system remains constant.
  • Momentum is equal to the mass of an object multiplied by its velocity and is equivalent to the force required to bring the object to a stop in a unit length of time.
  • For any array of several objects, the total momentum is the sum of the individual momenta.
  • There is a peculiarity, however, in that momentum is a vector, involving both the direction and the magnitude of motion, so that the momenta of objects going in opposite directions can cancel to yield an overall sum of zero.

To know more about conservation of momentum, refer:

brainly.com/question/7538238

#SPJ4

4 0
2 years ago
Suppose a ray of light traveling in a material with an index of refraction n a reaches an interface with a material having an in
KATRIN_1 [288]

Answer: C and D

Explanation: One of the first rule for total internal reflection to occur is that the ray must move from a dense to a less dense medium, hence refractive index of medium a must be greater than that of b.

When a ray moves from a dense to a less dense medium, the refracted ray moves away from the normal thus increasing the size of the angle of refraction (total internal refraction occurs when the angle of refraction is 90° and the angle of incidence at this point is known as the critical angle), hence the angle of incidence must be greater than the critical angle.

These points verifies option C and D

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