Newton's 3 Laws of motion [Inertia, Force, Mass, Acceleration, Action, & Opposite Reaction]

Показать описание

Newton's first law of motion states that an object that is at rest will remain at rest unless acted upon by an unbalanced force, An example of this is a ball that is kicked.

Newton's second law of motion states that acceleration occurs when a force acts on mass. The greater the mass, the more force is required to cause acceleration. Force is equal to mass multiplied by acceleration or F = ma. For example, pushing a fridge requires a greater force than pushing a chair.

Newtons third law of motion states that for every action, there is an equal and opposite reaction. When you push on a wall the wall pushes back on you.

Another example of this is a rocket. The action of the fast hot gases flowing through the rocket nozzle are followed by a reaction, the acceleration of the rocket.

Newton's first law of motion or known as the law of inertia states that an object that is at rest will remain at rest unless acted upon by an unbalanced force.

For example, a box full of books will remain at rest if no force acts upon it.
A soccer ball, will also remain at rest unless it is kicked. The force of the kick will send the ball flying through the air which eventually will be slowed down by air resistance and gravity.

If there are no unbalanced forces acting on an object, its inertia will keep an object moving at the same speed and in the same direction.
For example, an object traveling in a vacuum where there is no gravity would continue to travel at a constant speed and in the same direction.
Let's pretend a ball is kicked in outer space where there is no force such as air resistance and gravity, the ball would continue to travel at a constant speed and in the same direction.

Unless there is a force to slow an object down its speed and direction remain constant. You've probably experienced the sensation of moving forward when a car suddenly slows down or stops. As the car suddenly stops, your body continues to travel at the same speed and in the same direction. The seat belt causes your body to halt or slow down and provides a restraining force to keep you from traveling in the same direction at the same speed and smashing into the windshield and getting hurt.
The same is true for a roller coaster. The straps on a roller coaster work as a restraining force to keep you from falling out as your body travels at very fast speed and in different directions.

Newton's second law of motion states that acceleration occurs when a force acts on an object or mass. The greater the mass, the more force is required to cause acceleration.

For example, the force required to move an object that weighs 40 lbs is less than the force needed to move an object that weighs 400 lbs.
You have probably noticed this when you have moved a chair and when you have moved a refrigerator.

Both objects have different masses, since the mass of the fridge is greater, it requires greater force to move than when moving a chair.
Newton's second law of motion also states how force influences an object's motion. Mathematically force is equal to mass multiplied by acceleration or F = ma.

When an equal force is applied to two objects, the acceleration will be greater for the object with less mass. The same is true for the object with more mass its acceleration will be less because it requires a greater force to accelerate.

When oceanic and continental plates collide with each other, an earthquake occurs. Although the forces acting on each other are the same, oceanic plates have greater density so their acceleration is less in comparison to a continental plate. The same is true for continental plates, since they are less dense their acceleration is greater.
Newtons third law of motion states that for every action, there is an equal and opposite reaction.

An example of this is a box on a table. As gravity pulls the box down, the table exerts an equal and opposite force upwards keeping the box in its place

Another example of this is when you push on a wall, the wall pushes back on you with an equal force.

We can also see this in sports such as tennis and soccer. The greater the force applied on a tennis ball, the more reaction force your arm receives from the racket.

The same is true for soccer. As the player exerts force on the soccer ball, when it is kicked, the soccer ball also exerts a force on the player’s foot.

Another example of Newton's third law is with rockets. Heated exhaust gas is created by the process of combustion in a rocket engine. The hot exhaust gas flows through the back of the rocket as it goes through the rocket nozzle.

A thrusting force is produced that accelerates the rocket and moves it forward.

Fast hot gases flowing through the rocket nozzle are the action, while the acceleration of the rocket is the reaction.