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Welcome to our website about engineering, motion, force and some of its principles. So what are motion and force? Some think that motion always applies to everything or everyone around it, but motion is actually a change in the distance between the object and its reference point. If a person isForce is just physical power or strength possessed by a living being. Along with these terms we will explore all kinds of different principles. Below are some explanations of principles that you may see a lot on this website.
Acceleration Due To Gravity
The acceleration due to gravity differs on each planet. The moon has a different amount of gravity than Earth. The gravitational pull is always towards the center of the planet; downward. The magnitude of g (gravity) is more important then the direction because the direction of g is often just used in mathematical equations. The magnitude also varies from planet to planet. The average value of g on the surface is about 9.8 meters per second squared. (This is in free fall, though, when the only force acting against it is gravity.) The closer you are to Earth’s core, the higher (or faster) the g. Also, every second something falls it doubles in speed. After one second of falling, it is going 9.8 m/s, and after two seconds it is going 19.8 m/s.
Fluid Friction
Fluid friction, is, in short, the resistance between layers of fluid. The amount of resistance that the fluid gives is based on how viscous it is. The less viscous it is, the easier it moves about and the less resistance it gives. For example, water is less viscous than honey and therefore has less friction.
Newton's First Law
Basically, it's inertia. Inertia is "an object in motion will stay in motion and an object at rest will stay at rest until acted upon by outside, unbalanced force".
Newton's Second Law
It is f = ma. This means force = mass x acceleration. What does this mean? Well, it is saying that how strong the force is is based on the object's mass and how fast it is going. If two objects are accelerating at the same rate, but one object has more mass, the object with more mass will have more force.
Newton's Third Law
Formally put, it is "for every action, there is an equal and opposite reaction". It is also called "action/reaction". One example to demonstrate this law is when you are stand on the floor. Even though gravity is pulling you down towards the floor, what is known as "normal force" pushes you up. The reason normal force doesn't have us all floating about is because normal force is as strong as gravity, allowing the forces to balance out.