10 Questions
What is the mathematical expression for the work done by a force F on a body displaced through a displacement s?
$W = F \cdot s$
What is the SI unit of work?
Joule
In which direction does positive work occur?
In the same direction as the force
What are the dimensions of work in terms of mass (M), length (L), and time (T)?
[ML²T–2]
What is the equivalent of 1 kilowatt-hour (kWh) in joules?
$3.6 \times 10^6$ joules
In which situation is the work done by gravity positive?
When a body falls freely under the action of gravity
When does zero work occur?
When pushing a wall and it remains at rest
In which scenario is the work done by frictional force negative?
When work done by braking force on the car occurs
What is the work done by a force F⃗ = (2ı̂ + 3ȷ̂ +k)N on a displacement s⃗ = (ı̂ + 4ȷ̂ + k)m?
-15 J
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?
-3, -3
This quiz covers the introduction of work and energy, including the concept of work done by a force, its mathematical representation, and the units and dimensions associated with work. Test your understanding of these fundamental concepts in physics.
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