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19 Cards in this Set
- Front
- Back
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What is energy?
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Energy is the ability to do work.
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What is work?
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Work is the transfer of energy to an object when the object moves due to the application of a force.
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Work equals force times ____?
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the displacement.
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The derived unit equal to the work done on an object when a force of one newton produces displacement of one meter is known as ______?
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Joule.
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If a force is applied to a mass, but the mass does not move, is any work done?
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No.
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What are the units for force and displacement?
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Force is measured in newtons, while displacement is measured in meters.
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The rate at which work is done is a scalar quantity known as ___?
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Power.
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Power equals work over distance.
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False.
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What is power expressed in?
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Joules per second.
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One joule of work done per second equals ___?
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One watt.
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What is potential energy?
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The energy possessed by an object due to its position or condition.
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The change in gravitational potential energy is given by the equation ____?
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PE= mgh.
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What is Hooke's Law?
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F(s) = kx.
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In the equation, F(s) = kx, what does the k represent and what does it mean?
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K represents the spring constant. This is the constant of proportionality between the applied force.
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The compression of a spring is the change in the spring's length.
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True.
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When no force is applied to a spring, there is a change in spring length from the equilibrium position.
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False.
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Define kinetic energy.
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The energy an object possesses due to its motion.
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The equation for kinetic energy can be derived from what two sources?
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The definition of work and Newton's second law.
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Explain the law of conservation of energy.
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Energy cannot be created nor destroyed.
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