1. Luke Autbeloe drops a pile of roof shingles from the top of a roof located 8.52 meters above the ground. Determine the time required for the shingles to reach the ground.
2. Rex Things throws his mother's crystal vase vertically upwards with an initial velocity of 26.2 m/s. Determine the height to which the vase will rise above its initial height.
3. A problem about a car (US version).
a. A car is said to go "zero to sixty in six point seven seconds". What is its acceleration in m/s2?
b. Let's just assume our car is traveling at 35.8 m/s. What acceleration would it have if it took 2.0 s to come to a complete stop?
4. A crate of food supplies is dropped from an airplane flying horizontally at 56 m/s (about 125 miles an hour). The altitude of the plane is 2 E 2 meters. There will be total parachute failure due to the old rotten parachutes that have to be used. How many meters short of the target area must the crate be dropped to insure a hit.
5. A large rock is dropped from a bridge into the river below.
a) if the time required to fall is 1.7 seconds, with what velocity, in m/sec, does it hit the water? b) what is the height, in meters, of the bridge above the water?
6. How many seconds does it take a metal ball to drop 400 m from rest? What velocity does it achieve?
7. A suitcase is accidentally dropped from an airplane flying at an altitude of 1 E 4 m. With what final velocity does it strike the earth?
8. A plane is flying at 8 000 m. If a package is dropped from the plane a) how long will it take the package to reach the ground? b) what would be the acceleration of that package as it fell if the plane was flying horizontally at 2 E 3 m/s? c) how far would the plane travel while the package was falling? d) how many kilometers away from the target area would the plane have to drop the package to have it hit the target area? e) how fast would the rock be traveling when it hit the ground?
Wednesday, December 5, 2007
Speed and Accelaration
To learn more the difference between speed and velocity click here
Acceleration on the other hand is different to know more about this click here
There is another kind of acceleration this acceleration due to gravity and the other name for this is free fall. click here to know more about it
sample calculaion click here
Acceleration on the other hand is different to know more about this click here
There is another kind of acceleration this acceleration due to gravity and the other name for this is free fall. click here to know more about it
sample calculaion click here
Motion
In physics, motion means a continuous change in the position of a body. All motion is the result of an applied force. Motion is typically described in terms of velocity, acceleration, displacement, and time. Additionally, once an object is in motion it gains a property called momentum which is related to the object's mass and velocity. Due to the law of conservation of momentum everything in the universe is constantly moving and the natural state of the universe is motion. However, because everything is in motion, true absolute motion cannot be determined, and only motion relative to a point of reference can be determined, this type of motion is known as relative motion.
Theories of Motion
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.
At very high speeds, the equations of classical physics were not able to calculate accurate values. To address these problems, the ideas of Henri Poincaré and Albert Einstein concerning the fundamental phenomenon of motion were adopted in lieu of Newton's. Whereas Newton's laws of motion assumed absolute values of space and time in the equations of motion, the model of Einstein and Poincaré, now called the special theory of relativity, assumed values for these concepts with arbitrary zero points. Because (for example) the special relativity equations yielded accurate results at high speeds and Newton's did not, the special relativity model is now accepted as explaining bodies in motion (when we ignore gravity. However, as a practical matter, Newton's equations are much easier to work with than those of special relativity and therefore are more often used in applied physics and engineering.
In the Newtonian model, because motion is defined as the proportion of space to time, these concepts are prior to motion, just as the concept of motion itself is prior to force. In other words, the properties of space and time determine the nature of motion and the properties of motion, in turn, determine the nature of force.
In the special relativistic model, motion can be thought of as something like an angle between a space direction and the time direction.
In special relativity and Euclidean space, only relative motion can be measured, and absolute motion is meaningless.
Relative motion
Relative motion is a change in location relative to a reference point, as measured by a particular observer in a particular frame of reference. Essentially, an object is in relative motion when its distance from another object is changing. However, whether the object appears to be moving or not depends on the point of view For example, a woman riding in a bus is not moving in relation to the seat she is sitting on, but she is moving in relation to the buildings the bus passes.
The place or object used for comparison to determine the change in position of an object is known as the reference point. Thus, if it is assumed that the reference point is stationary, an object can be said to be in motion if it changes position relative to a reference point. A classic misinterpretation of relative motion was the incorrect assumption that the Sun moved around the Earth rather than the other way around.
Theories of Motion
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.
At very high speeds, the equations of classical physics were not able to calculate accurate values. To address these problems, the ideas of Henri Poincaré and Albert Einstein concerning the fundamental phenomenon of motion were adopted in lieu of Newton's. Whereas Newton's laws of motion assumed absolute values of space and time in the equations of motion, the model of Einstein and Poincaré, now called the special theory of relativity, assumed values for these concepts with arbitrary zero points. Because (for example) the special relativity equations yielded accurate results at high speeds and Newton's did not, the special relativity model is now accepted as explaining bodies in motion (when we ignore gravity. However, as a practical matter, Newton's equations are much easier to work with than those of special relativity and therefore are more often used in applied physics and engineering.
In the Newtonian model, because motion is defined as the proportion of space to time, these concepts are prior to motion, just as the concept of motion itself is prior to force. In other words, the properties of space and time determine the nature of motion and the properties of motion, in turn, determine the nature of force.
In the special relativistic model, motion can be thought of as something like an angle between a space direction and the time direction.
In special relativity and Euclidean space, only relative motion can be measured, and absolute motion is meaningless.
Relative motion
Relative motion is a change in location relative to a reference point, as measured by a particular observer in a particular frame of reference. Essentially, an object is in relative motion when its distance from another object is changing. However, whether the object appears to be moving or not depends on the point of view For example, a woman riding in a bus is not moving in relation to the seat she is sitting on, but she is moving in relation to the buildings the bus passes.
The place or object used for comparison to determine the change in position of an object is known as the reference point. Thus, if it is assumed that the reference point is stationary, an object can be said to be in motion if it changes position relative to a reference point. A classic misinterpretation of relative motion was the incorrect assumption that the Sun moved around the Earth rather than the other way around.
Thursday, November 29, 2007
Vectors
Physics is very much in tuned with movement and some of it may specify direction thus the study of vectors is very important
to know more what is a vectors click here
if you already have the general idea on what is the direction of a vector practice your skill by clicking here
What if you have many vectors and running in every direction? well addition of vectors is the answer to that to learn more click here
to know more what is a vectors click here
if you already have the general idea on what is the direction of a vector practice your skill by clicking here
What if you have many vectors and running in every direction? well addition of vectors is the answer to that to learn more click here
Tuesday, November 27, 2007
Unit Conversion
Measurement explores procedures for measuring and learn about standard units in the metric and customary systems, the relationships among units, and the approximate nature of measurement. You will also examine how measurement can illuminate mathematical concepts such as irrational numbers, properties of circles, and area and volume formulas, and discover how other mathematical concepts can inform measurement tasks such as indirect measurement.
What is SI system of measurement?
To learn more on this and the metric system click here
What is the british system of measurement?
To learn about English measurement click here
Now that you have the fundamental learnings how do we convert unit?
Several steps need to be taken click here to understand better
To check your answers try to test in this online unit converter click here
What is SI system of measurement?
To learn more on this and the metric system click here
What is the british system of measurement?
To learn about English measurement click here
Now that you have the fundamental learnings how do we convert unit?
Several steps need to be taken click here to understand better
To check your answers try to test in this online unit converter click here
Mathematics - The Language of Science
Science was transformed in the seventeenth century when it was learned that nature can be analyzed and described mathematically. When the ideas of science are expressed in mathematical terms, they are unambiguous. They don't have the double meanings that so often confuse the discussion of ideas expressed in common language. when the findings in nature are expressed mathematically they are easier to verify or to disprove by experiment. The methods of mathematics and experimentation led to enormous success of science
Different Branches of Physics
Physics like chemistry and biology also has many sub branches
They are made up into 3 major categories mechanics, modern, and applied physics
To know more of these branches click here
Physics - the most basic of all science
Physics is more than a part of the physical sciences but is in fact the most basic of all sciences. Physics is about motion, forces, energy, matter, heat, sound, light, and the most composition of atoms. Chemistry is about how matter is put together, how atoms combine to form molecules, and how molecules combine to make up many kinds of matter around us. Biology is still more complex and involves matter that is alive. so physics supports chemistry, which in turn supports biology. The idea of physics are fundamental to these more complicated sciences. That's why physics is the most basic science. you can understand other sciences much better if you first understand physics.
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