Class 9 Work and Energy Extra Question Answer
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Q: What is work according to science?
A: Work is the product of force and displacement in the direction of the force (W = F × s).
Q: What is the SI unit of work?
A: The SI unit of work is Joule (J) or Newton-meter (N m).
Q: When is work said to be zero?
A: Work is zero when either the force is zero or the displacement is zero.
Q: What is energy?
A: Energy is the capacity to do work.
Q: What is kinetic energy?
A: Kinetic energy is the energy possessed by an object due to its motion.
Q: Write the formula for kinetic energy.
A: Kinetic energy = ½mv², where m is mass and v is velocity.
Q: What is potential energy?
A: Potential energy is the energy possessed by an object due to its position or configuration.
Q: What is the formula for gravitational potential energy?
A: Gravitational potential energy = mgh, where m is mass, g is acceleration due to gravity, and h is height.
Q: What is power?
A: Power is the rate of doing work or the rate of energy transfer.
Q: What is the SI unit of power?
A: The SI unit of power is Watt (W).
