Interview
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Interview study book Wft PE Schade particulier of Lindenhaeghe - ISBN: 9789491679292 (Zksznssm)
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CHAPTER 11 “Work & Energy”KEY CONCEPTS [ *rating as per the significance of concept]
1 Work Done By A Constant Force ***
2 Energy And Its Forms(Kinetic Energy & *****
Potential Energy)
Are Various Energy Forms Inter convertible?
3 Potential Energy Of An Object At A Height *****
4 Law Of Conservation Of Energy ****
5 Rate Of Doing Work & Commercial Unit Of ****
Energy
1.Work Done By A Constant Force
Work is a scalar quantity equal to the product of the displacement x and the
component of the force Fx in the direction of the displacement..
Work is defined as a force acting upon an object to cause a displacement
Mathematically, work can be expressed by the following equation.
W= F x d cos q ( cos 00 = 1)
where F = force, d = displacement, and the angle (theta) is defined as the angle
between the force and the displacement vector
Three things are necessary for the performance of work:
There must be an applied force F.
There must be a displacement x.
The force must have a component along the displacement
Negative Work
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, The friction force f opposes the displacement
Positive Work
Force F contributes to displacement x.
Test Yourself:
1.Calculate Work when F= 40 N and x = 4 m.
2.Calculate Work when F = -10 N and x = 4 m.
3. A lawn mower is pushed a horizontal distance of 20 m by a force of 200 N directed at an
angle of 300 with the ground. What is the work of this force?
4. A student lifts a 50 pound (lb) ball 4 feet (ft) in 5 seconds (s). How many joules of work has
the student completed?
2.Energy And Its Forms
James Joule
The metric system unit of energy is the joule (J), after James Joule.
• Mechanical energy is the energy which is possessed by an object due to its motion or
its stored energy of position
Forms of Energy
• Kinetic energy : is the energy of motion
Energy which a body possesses because of its motion, which occurs anywhere
from an atomic level to that of a whole organism
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