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WORK, POWER, ENERGY, MOMENTUM, AND IMPULSE!!

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BC: THE END!!! (:

FC: created by: Samantha Delarosa!

1: WORK! Work is a transfer of energy! In physics we say that work is done on an object when you transfer energy to that object. For introductory thinking, this is the best definition of work. If a first object is the agent that gives energy to a second object, then the first object does work on the second object. The energy goes from the first object into the second object. At first we will say that if an object is standing still, and you get it moving, then you have put energy into that object.

2: For example, a golfer uses a club and gets a stationary golf ball moving when he or she hits the ball. The club does work on the golf ball as it strikes the ball. Energy leaves the club and enters the ball. This is a transfer of energy. Thus, we say that the club did work on the ball. And, before the ball was struck, the golfer did work on the club. The club was initially standing still, and the golfer got it moving when he or she swung the club.

3: W = F dFormula for work. W = (20 N)(3 m)Plug in values for force and displacement. W = 60 N-mWork equals 60 units of energy transferred. Looks like the unit for energy transferred, and thus, the unit for energy, is Newton-meter. However, this is not so. W = 60 JoulesEnergy units are called Joules, 1 Joule is equal to 1 Newton-meter. A Joule is the MKS metric unit for energy. W = 60 JJoule is abbreviated J.

4: Power (symbol: P) is the amount of work W done per unit of time t. This can be modeled as an energy flow, equivalent to the rate of change of the energy in a system, or the time rate of doing work.

5: Ex. Climbing a flight of stairs requires a certain amount of work to overcome the gravitational force. This amount of work is the same whether one climbs the stairs slowly or runs up the stairs quickly. However you are more likely to be breathing heavily after running up the flight of stairs than after climbing them slowly. Why? The difference is power. The total work or energy is the same either way, but running up the stairs quickly requires more power than walking up slowly. | Power = Energy/Time, or Power = Work/Time

6: Energy-power which may be translated into motion, overcoming resistance, or effecting physical change; the ability to do work. | Examples of Energy! kinetic energy the energy of motion. potential energy energy at rest or not manifested in actual work.

7: Example of Energy! nuclear energy energy that can be liberated by changes in the nucleus of an atom (as by fission of a heavy nucleus or fusion of light nuclei into heavier ones with accompanying loss of mass).

8: When an object is moving, it has a non-zero momentum. If an object is standing still, then its momentum is zero. | Momentum is a vector. That means, of course, that momentum is a quantity that has a magnitude, or size, and a direction.

9: Momentum- is the product of an object's mass and velocity. It is a vector. The SI units of momentum are kg * m/s.

10: Impulse- is the multiplication of applied force and time interval it applied. Impulse is also a vector quantity having both magnitude and direction. It has the same direction with applied net force.

11: Impulse=Change in Momentum

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  • By: Samantha D.
  • Joined: about 6 years ago
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  • Title: WORK, POWER, ENERGY, MOMENTUM, AND IMPULSE!!
  • THE MEANINGS OF ALL, AND HOW THE WORK!
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  • Published: almost 6 years ago

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