Topic 2.3: Work, Energy, and Power Flashcards

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1
Q

• 2.3.1: Outline what is meant by work

A

o WORK: Work is done when a force moves an object in the direction of the force. Work is a scalar quantity

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2
Q

Define joule

A

o JOULE: The unit of energy. The SI unit is the joule. 1J=1N*1m

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3
Q

• 2.3.2: Determine the work done by a non-constant force by interpreting a force-displacement graph

A

o WORK DONE BY A NON-CONSTANT FORCE: Work done is the area under the force-distance graph. Eg for Hooke’s law, W=½kx^2

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4
Q

Define energy

A

o ENERGY: The ability to do work.

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5
Q

• 2.3.4: Outline what is meant by kinetic energy

A

o KINETIC ENERGY: Energy an object has as a result of its motion.

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6
Q

• 2.3.5: Outline what is meant by change in gravitational potential energy

A

o GRAVITATIONAL POTENTIAL ENERGY: Energy an object has a result of its position in a gravitational field.

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7
Q

• 2.3.6: State the principle of conservation of energy

A

o PRINCIPLE OF CONSERVATION OF ENERGY: Energy is never created nor destroyed. It just changes from one form to another.

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8
Q

Define elastic collisions

A

o ELASTIC COLLISIONS: KE is conserved in these collisions. (Momentum is conserved in every collision).

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9
Q

Define explosive collisions

A

o EXPLOSIVE COLLISIONS: KE is increased in this collision

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10
Q

Define inelastic collisions

A

o INELASTIC COLLISIONS: The total KE is decreased. If the objects stick together, the collision is PERFECTLY inelastic.

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11
Q

Define power

A

o POWER: The rate of doing work. Unit is the watt. 1W=1Js-1

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12
Q

• 2.3.10: Define and apply the concept of efficiency

A

EFFICIENCY: Fraction of energy which is usefully transferred.
Efficiency=(useful work done)/(total work done)

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