2. Energy Flashcards

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1
Q

What is the relationship between work done, force, and distance?

A

The relationship between work done, force, and distance is: Work done = Force × Distance.

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2
Q

What is the efficiency of a device?

A

Efficiency is the ratio of useful energy out to total energy in, expressed as a percentage.

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3
Q

What factors are considered when selecting fuels for different situations?

A

Factors such as ease of storage, energy content, and safety are considered when selecting fuels for different situations.

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4
Q

How is energy transferred when work is done against frictional forces?

A

When work is done against frictional forces, energy is transferred, usually in the form of heat.

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5
Q

What is meant by energy transfer, and how does it occur?

A

Energy transfer refers to the movement of energy from one place to another or from one form to another. It occurs when a system changes.

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6
Q

What is meant by the conservation of energy?

A

The conservation of energy states that energy cannot be created or destroyed; it can only be transferred or transformed from one form to another.

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7
Q

What are some examples of renewable energy sources, and why are they important?

A

Examples of renewable energy sources include wave power, solar power, and geothermal power.

They are important because they are sustainable and have minimal environmental impact compared to non-renewable sources like fossil fuels.

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8
Q

How is elastic potential energy calculated for a stretched spring?

A

Ee = ½ke²

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9
Q

What formula is used to calculate gravitational potential energy for an object raised vertically?

A

Ep = m×g×h,

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10
Q

What is the formula for kinetic energy of a moving object?

A

Ek = ½mv²

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11
Q

How is power related to work done or energy transferred over time?

A

P = W/t

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12
Q

What is an example of oscillating motion where energy is transferred between kinetic energy and gravitational potential energy?

A

A simple pendulum.

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13
Q

What happens when energy is transferred, and only part of it is used for its intended purpose?

A

When energy is transferred, only a portion of it may be usefully transferred, with the remainder being dissipated and stored in less useful forms. This phenomenon is often referred to as energy being ‘wasted’.

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14
Q

How is efficiency calculated?

A

(useful energy out/total energy in) × 100

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