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Questions and Answers
What is the mathematical expression for the work done by a force F on a body displaced through a displacement s?
What is the mathematical expression for the work done by a force F on a body displaced through a displacement s?
- $W = F/s$
- $W = F - s$
- $W = F \cdot s$ (correct)
- $W = Fs$
What is the SI unit of work?
What is the SI unit of work?
- Erg
- Newton
- Dyne
- Joule (correct)
In which direction does positive work occur?
In which direction does positive work occur?
- In the same direction as the force (correct)
- In the opposite direction of the force
- Perpendicular to the force
- At an angle of 45 degrees to the force
What are the dimensions of work in terms of mass (M), length (L), and time (T)?
What are the dimensions of work in terms of mass (M), length (L), and time (T)?
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What is the equivalent of 1 kilowatt-hour (kWh) in joules?
What is the equivalent of 1 kilowatt-hour (kWh) in joules?
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In which situation is the work done by gravity positive?
In which situation is the work done by gravity positive?
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When does zero work occur?
When does zero work occur?
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In which scenario is the work done by frictional force negative?
In which scenario is the work done by frictional force negative?
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What is the work done by a force F⃗ = (2ı̂ + 3ȷ̂ +k)N on a displacement s⃗ = (ı̂ + 4ȷ̂ + k)m?
What is the work done by a force F⃗ = (2ı̂ + 3ȷ̂ +k)N on a displacement s⃗ = (ı̂ + 4ȷ̂ + k)m?
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If a force F⃗ = ( ı̂ + 2ȷ̂ − 15k ) N displaces a particle from origin to point P(α, α, 1), for which values of α are force and displacement orthogonal to each other?
If a force F⃗ = ( ı̂ + 2ȷ̂ − 15k ) N displaces a particle from origin to point P(α, α, 1), for which values of α are force and displacement orthogonal to each other?
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