Master the Concept of Work in Physics

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Questions and Answers

Which of the following statements about work in physics is correct?

  • Work is the energy transferred to an object via the application of force perpendicular to a displacement.
  • Work is the energy transferred to an object via the application of force in a random direction.
  • Work is the energy transferred to an object via the application of force in the opposite direction of a displacement.
  • Work is the energy transferred to an object via the application of force along a displacement. (correct)

When does a force do negative work?

  • When it has a component perpendicular to the direction of the displacement.
  • When it has a component opposite to the direction of the displacement. (correct)
  • When it has a component in a random direction.
  • When it has a component in the direction of the displacement.

When does a force do positive work?

  • When it has a component in a random direction.
  • When it has a component opposite to the direction of the displacement.
  • When it has a component in the direction of the displacement. (correct)
  • When it has a component perpendicular to the direction of the displacement.

What is the work done by the gravitational force on a ball when it is dropped?

<p>$\text{Work} = \text{weight} \times \text{distance}$ (B)</p> Signup and view all the answers

What is the work done by the gravitational force on a ball when it is thrown upwards?

<p>$\text{Work} = \text{weight} - \text{distance}$ (C)</p> Signup and view all the answers

Which of the following is the correct formula for calculating work in its simplest form?

<p>Work = force × displacement (C)</p> Signup and view all the answers

When does a force do positive work?

<p>When it has a component in the direction of displacement (A)</p> Signup and view all the answers

When does a force do negative work?

<p>When it has a component opposite to the direction of displacement (B)</p> Signup and view all the answers

What is the work done by the gravitational force on a ball when it is dropped?

<p>Positive (C)</p> Signup and view all the answers

What is the work done by the gravitational force on a ball when it is thrown upwards?

<p>Negative (A)</p> Signup and view all the answers

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