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Physics Y9 > Energy > Flashcards

Energy Flashcards

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1
Q

What does kinetic energy describe?

A

The energy an object has because it is moving

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2
Q

What is the thermal energy store associated with?

A

The temperature of an object

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3
Q

When does the gravitational energy store increase?

A

If an object rises

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4
Q

Attracting poles are…

A

Pulled further apart

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5
Q

Like poles are…

A

Pushed closer together

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6
Q

Name 4 ways energy can be transferred

A

Mechanical working, heat, radiation, and electricity

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7
Q

Formula for gravitational energy store

A

Ep=mgh or change in gravitational potential energy= mass x gravitational field x height

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8
Q

Formula for kinetic energy store

A

Change in kinetic energy= mass x velocity squared divided by 2

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9
Q

Formula for elastic store

A

Elastic energy= spring constant x spring extension divided by 2

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10
Q

Spring constant

A

A measure of the spring’s stiffness

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11
Q

Work done

A

A measure of how much energy is transferred by mechanical working

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12
Q

Formula for work done

A

W=Fs or work done= force x mechanical working

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13
Q

Power dictates the…

A

Size of the force

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14
Q

Formula for power

A

P= w divided by t

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15
Q

Where is energy often dissipated?

A

Into the thermal store as wasted energy

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16
Q

Formula for efficiency

A

Efficiency= useful energy output divided by total energy output

17
Q

If a penny is dropped in a closed system with no air resistance, will there be a change in overally energy?

A

No, energy will simply be transferred from the gravitational to the kinetic store

18
Q

Hooke’s Law

A

The extension of a spring is directly proportionate to the force applied provided the limit of proportionality is not exceeded

19
Q

Formula for force applied to a spring

A

Force= spring constant x extension

20
Q

If an object is elastically deformed…

A

It returns back to it’s original shape and length when the force is removed

21
Q

If an object is inelastically deformed…

A

It does not return to it’s original shape and length ater the force is removed

22
Q

A method for investigating hooke’s law

A

Adding increasing masses onto a spring until when the force is removed it does not return to it’s original shape

Physics Y9 (5 decks)

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