Work and energy are among the most important concepts in physics and form a crucial part of the MDCAT preparation for medical and dental entrance exams. These two concepts are so closely interrelated that work is done if force applied to an object changes the energy of that object. Understanding how work and energy relate to each other is essential in solving problems relating to motion, forces, and systems. By mastering these principles, MDCAT students will be able to confidently approach questions on energy and work in the MDCAT Quiz.
Understanding Work and Energy
Work is identified as the transfer of energy that takes place when a force acts upon an object and displacement occurs. The work formula is:
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cos
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W=F⋅d⋅cos(θ)
where
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W is the work done,
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F = the force applied
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d is the displacement, and
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θ is the angle between the force and displacement vectors. Work is measured in joules (J) in the SI system.
Energy, on the other hand, is the ability to do work. There are many forms of energy, but kinetic energy and potential energy are the most common in projectile motion and mechanical systems. The kinetic energy
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KE of an object is given by:
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1
2
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ℝ
2
KE
2
1
mv
2
where
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m is the mass of the object and
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v is its velocity. Potential energy
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PE, usually gravitational potential energy, is given by:
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∷
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ℎ
PE=mgh
where
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m is the mass,
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g is the acceleration due to gravity, and
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h is the height. MDCAT students are supposed to be able to use these equations in solving problems involving transfer of energy and work-energy theorem.
MDCAT Quiz: Work and Energy Questions
In the MDCAT Quiz, students will encounter questions that require applying the concepts of work and energy. These questions may involve calculating the work done by a force, determining the kinetic or potential energy of an object, or solving problems related to energy conservation. For example, students might be asked to calculate the amount of work done when lifting an object against gravity, or to determine the velocity of an object after a certain amount of work has been done on it. A common problem could involve the work-energy theorem, which states that the work done on an object is equal to the change in its kinetic energy. Solving such problems efficiently requires a solid understanding of the concepts and equations of work and energy.
Free Flashcards to study Work and Energy
Free flashcards can be a great tool for an MDCAT student to grasp the concepts of work and energy. Flashcards can contain important formulas: calculating work, kinetic energy, potential energy, and energy conservation. If students regularly go through these flashcards, they would be able to recall all the required equations and can easily apply them in the Work and Energy problems given in the MDCAT Quiz. Flashcards enable a student to practice answering typical questions on energy transfer and conservation, which helps them feel more confident and better prepared for their exams.
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