Motion And Physics

What we absorb from it.

The Basics Of Motion

The act, process, or state of changing place or position; movement; the passing of a body from one place or position to another, whether voluntary or involuntary; -- opposed to rest. Power of, or capacity for, motion.


Which of these are considered to be motion? (Poll)

Relative Motion, Speed, Displacement,Velocity, and Acceleration

Motion isn't just basic movement. You have to deal with speed, velocity, acceleration, distance, speed,displacement, average velocity,and instantaneous velocity. Sure these things may sound the same but they are all different. Not just their definitions either;they each have their own calculations.

An object is in motion when it is continuously changing its position relative to a reference point and is observed by a person or detection device. For example, you can see that an automobile is moving with respect to the ground.

The displacement of an object is how far out of place an object is; better known as the object's overall change in position.

The distance the object goes in a period of time is its speed. If the speed of an object is in a specific direction, it is called velocity. The change in velocity over a period of time is the acceleration of the object.




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Calculating Motion

There are different formulas to use while calculating different things relating to motion. Such as calculating speed and velocity is Distance Divided By Time (D/T). The formula A=F/M where F stands for net force applied to mass and M is the change in velocity. So if an object's velocity changes from 20 meters to 40 meters per second in 10 seconds its acceleration is (40-20)/10= 2 meters per second, per second or 2 meters per second squared. For circular motion, centripetal acceleration is v^2/r where v is the linear velocity of the object and r is the radius of the circular path.


Difference between instantaneous and average velocity,speed, and acceleration.

Average velocity is the velocity in time between two points. Instantaneous velocity is one point in time that is measured. Average speed is the total amount of distance traveled divided by the total amount of time taken. Instantaneous velocity is an instant in time and can be viewed as the distance traversed divided by the the traversal time (which is made very small). This can be written as a derivative. Average acceleration is the change in velocity over time, which is the most common known form of acceleration. Instantaneous acceleration is the acceleration at one point(on a velocity vs time graph that point in time would be the slope of the line).

Poll Everywhere

This is a link to our poll with a question relating to motion.

Law of Inertia(Newton's First Law of Motion.)

An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion unless acted upon by an unbalanced force. This means that there is a natural tendency for objects to keep doing what they're doing unless acted upon by an unbalanced force. All objects resist their state of motion. Without an unbalanced force, an object in motion will stay in that state of motion. For example, A ball sitting on a counter will remain in the same place unless something moves it. Also if you hit a baseball it would keep going if gravity didn't act upon it and once it hit the ground it would keep rolling if friction didn't act upon it.

Newton's Second Law of Motion

The relationship between an objects mass (m), its acceleration (a) and the applied force (F) is F=ma. Acceleration and force are vectors; in this law the direction of the force vector is the same as the one direction of the acceleration vector. According to Newton, an object maintains a certain velocity unless an object acts on it to change its acceleration(thus a change in the velocity). Acceleration= Mass/Force. So basically if a truck hits a car the car moves forward. The truck provides the force, the car is the mass, and the acceleration is how fast the car is moving forward. The lighter the car the farther and faster it will move.

Newton's 3rd Law of Motion

For every action there is an equal and opposite reaction. For example, if as you step out of a boat onto the bank; as we move in the direction of the shore, the boat tends to move in the opposite direction. Which if you're not careful could cause you to faceplant!

Your opinion on Newton?

This is a link to a page on that also contains a short instructional video.
This is a short voki about the general idea of motion.

Animoto Video Over Motion and Movement

Quotes Of Physical Motion

Never confuse motion with action.
Benjamin Franklin

I were better to be eaten to death with a rust than to be scoured to nothing with perpetual motion.
William Shakespeare

Ta-Da Sparkles

Our Motion Flyer. Kaitlyn, Caitlyn, and April.