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Questions and Answers
When does a force do negative work?
When does a force do negative work?
- When it has a component in the same direction as the displacement at the point of application
- When it has no component in the direction of the displacement at the point of application
- When it has a variable component with respect to the displacement at the point of application
- When it has a component opposite to the direction of the displacement at the point of application (correct)
What is the work done by the gravitational force when a ball is thrown upwards?
What is the work done by the gravitational force when a ball is thrown upwards?
- $0$
- $Wd$
- $-Wd$ (correct)
- $Wd^2$
What is the work done by the gravitational force when a ball is held above the ground and then dropped?
What is the work done by the gravitational force when a ball is held above the ground and then dropped?
- $-Wd$
- $Wd^2$
- $0$
- $Wd$ (correct)
What does work equal in its simplest form for a constant force aligned with the direction of motion?
What does work equal in its simplest form for a constant force aligned with the direction of motion?
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When is a force said to do positive work?
When is a force said to do positive work?
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