Q1
What is the work formula?
AW=F×s
BW=F+s
CW=F÷s
DW=F-s
SSCClass 9 (SSC)Science and Technology (विज्ञान आणि तंत्रज्ञान)Ch 2 · Topic 2
Practice and Revision - Work and Energy
Let us practise and revise what we learned about work and energy. Work is done when a force causes displacement, and energy is the capacity
Core concept
Work is calculated as force multiplied by displacement in the direction of force (W=F×s), measured in joules.
How it works
Kinetic energy, the energy of motion, is calculated as ½mv², depending on an object's mass and velocity.
Why it matters
Potential energy, stored energy due to position, is calculated as mgh for gravitational potential energy, depending on height.
Key detail
The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another.
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Quick notes
• Work = force × displacement (W=F×s).
• Measured in joules.
• Kinetic energy = ½mv² (motion energy).
• Depends on mass, velocity.
• Potential energy = mgh (stored, positional).
• Gravitational PE depends on height.
• Conservation of energy: can't create/destroy.
• Energy only transforms between forms.