Search Results - Motion (physics)
| Type in a word or phrase to search, you can also type in Article ID's separated by commas: |
 |
|
|
In physics, motion means a constant change in the location of a body. Change in motion is the result of applied force. Motion is typically described in terms of velocity, acceleration, displacement, and time. [1] An object's velocity cannot change unless it is acted upon by a force, as described by Newton's first law. An object's momentum is directly related to the object's mass and velocity, and the total momentum of all objects in a closed system (one not affected by external forces) does not change with time, as described by the law of conservation of momentum. A body which does not move is said to be at rest, motionless, immobile, stationary, or to have constant (time-invariant) position. Motion is always observed and measured relative to a frame of reference. As there is no absolute reference frame, absolute motion cannot be determined; this is emphasised by the term relative motion.[2] A body which is motionless relative to a given reference frame, moves relative to infinitely many other frames. Thus, everything in the universe is moving.[3] Until the end of the 19th century, Isaac Newton's laws of motion, which he posited as axioms or postulates in his famous Principia were the basis of what has since become known as classical physics. Calculations of trajectories and forces of bodies in motion based on Newtonian or classical physics were very successful until physicists began to be able to measure and observe very fast physical phenomena.
|
Showing 1 to 9 of 9 Articles matching 'Motion (physics)' in related articles. |
| Pages: 1 |
 |
|
|
|
1. The Physics of Weight Lifting. Part 4, Work.
October 24, 2008
In part 4 of this series we'll look at the formula for work and how we can use it to monitor our training. The formula for work is: Force X Distance.
When we workout we use a certain amount of muscular force to lift a weight across a certain distance, the work done is measured in Foot/Pounds. If we kept track of the work we do each workout it will tell us much about our progress and also how we should proceed with our training. You can measure the work done each workout in the following way:
1. Take an empty bar and do the full range motion for each exercise you are currently doing i... (read more)
Author: Paul Becker
|
|
|
|
|
2. The Physics Of Weight Lifting. Part 3, Mechanical Advantage.
October 24, 2008
Here in the third part of this series we will examine mechanical advantage and how this effects weight training and how it can be used to our advantage to get better/faster results. Mechanical Advantage - is the ratio of the force exerted by a machine to the force applied to a machine.
Our muscles contract to exert force and our skeletal structures (made up of simple machines - hinges, ball and sockets, etc..) transfer that force into motion. But the force exerted by our muscles (input) is not equal to the force we can use to move our bodies or lift other objects (output). let's look at ... (read more)
Author: Paul Becker
|
|
|
|
|
3. The Physics of Weight Lifting. Part 2, Friction.
October 24, 2008
In part 2 of this series we'll look at friction and how it can affect our training. Friction is defined as - (1) A rubbing of one object or substance against another. (2) The resistance to motion of moving surfaces that touch.
When working with machines friction can become a problem, you have the situation of weight on the machine plus friction making it feel much heavier than the weight stack says it is. This can wreck your progression, let's say you're going along on lat pulldowns, last workout you made over 10 reps, you add 5 lbs and start to pull and nothing happens, a big yank gets t... (read more)
Author: Paul Becker
|
|
|
|
|
4. GOLF SCHOOL AND THE OVERLOOKED FUNDAMENTAL
September 19, 2008
The golf swing is first and foremost a motion. No matter how well accomplished someone may be at the static positions of the golf swing, a repeating motion is the cohesion that ties them all together. Since it is, it must adhere to some simple laws of physics…namely the law of inertia and centrifugal force. The law of inertia states that once something is in motion is will stay on its path and in its plane of movement unless an outside force acts upon it. Centrifugal force is simply the outward tug on an object that is rotating around a central point or axis. Take full advantage of these two f... (read more)
Author: Marketing Guru
|
|
|
|
|
5. The Physics of NASCAR
December 31, 2007
Even though NASCAR started as a backwoods illegal race to run moonshine, it has today evolved into a sport that is not only entertaining but depends on physics too. The obvious element in the physics of NASCAR is the aerodynamic design required by these cars in order to achieve top speeds of near 200 mph with the minimum drag coefficient. But there are other forces involved too such as Newton’s Law of Motion and centripetal force.
Newton’s Law of Motion states that a body will remain in motion unless it is acted upon by some external force. In outer space for example, in the absence of g... (read more)
Author: chris dicicco
|
|
|
|
|
6. What is so Important about a Golf Swing?
August 08, 2007
What is so important about a Golf Swing ? The purpose of a golf swing is to make the golf club hit the ball to a desired position. The full golf swing is an unnatural, highly complex motion and notoriously difficult to learn. In fact the basic golf swing is much more physics that strength. The golf swing is an awkward movement that puts a tremendous amount of stress on the body. For nearly every weekend golfer, the golf swing is the number one problem out on the course. The Swing You will have already noted that each club has a different job to do and part of the basic golf swi... (read more)
Author: Joe Dostal
|
|
|
|
|
7. The Golf Swing Physics
May 16, 2007
Swing is a major factor determining a players quality in golf. Physics, physics and more physics is what a golf swing is all about. Based on the concept of impact and angular motion from mechanical physics, a golf swing is fully scientific and loaded with concepts from physics. Torque is generated by the twisting swing the golf club. This torque causes rotation by impacting the angular velocity of the golf club. The momentum generated at any point is a product of the mass and the velocity of the moving object and with almost all club heads weighing just about equally, the impact on the... (read more)
Author: Steve Katz
|
|
|
|
|
8. In Golf, It' Now Hip to be Square
May 04, 2007
The new rage for 2007 is square headed drivers. Every manufacturer is scrambling to release their version of the square head. But is it really "hip to be square"? or is this just another marketing gimmick promising everyone straighter drives on the golf course.To really know, you need to understand moment of inertia or MOI as the golf industry calls it. MOI is a property of physics that indicates the relative difference in how easy or difficult it will be to set any object in motion about a defined axis of rotation. That was for all you physics majors. Now for the rest of us golfers, MOI ... (read more)
Author: David Laible
|
|
|
|
|
9. Time and Its Inseparable Role in The Fabric of The Universe
October 10, 2006
The notion of time pervades our everyday lives so strongly that we often take it for granted. Time is so familiar yet is one of the most puzzling subjects of modern science. Historically, the first concept of time as it relates to theoretical physics was of absolute time. That is, time is assumed to be a fixed entity and all observers measure the same time. In 1676, by observing the motion of Jupiter's moons, Danish astronomer Ole Rømer discovered that light had a finite speed. The discovery lead to some interesting revelations about light's relationship to time and how when we lo... (read more)
Author: Paul Kennard
|
|
|
|
|
