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Work, Power, and Energy in Applied Physics-I

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Work, Power, and Energy in Applied Physics-I

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Questions and Answers

What is the definition of work in physics?

The dot product of displacement and force (correct)

Energy manifested in various forms

The area under a force-displacement curve

The capacity to do work

When does a force do negative work?

When the angle between force and displacement is 0°

When the angle between force and displacement is 90°

When the force is in the same direction as the displacement

When the angle between force and displacement is 180° (correct)

What are the units of work in the SI system?

Newton

Joule (correct)

Dyne

Erg

What does the area under a force-displacement curve represent?

The work done by a varying force Signup and view all the answers

Which condition results in zero work done by a force?

Force and displacement are perpendicular (90°) Signup and view all the answers

Which of the following best defines work?

Work is done when there is displacement in the direction of the force Signup and view all the answers

In which scenario is work considered to be negative?

When the force and displacement are in opposite directions Signup and view all the answers

What is the importance of a force-displacement curve?

It provides information about energy transfer Signup and view all the answers

How is kinetic energy best defined?

Energy associated with motion Signup and view all the answers

What does the law of conservation of mechanical energy state?

The sum of kinetic and potential energy is constant in a closed system Signup and view all the answers