4.1.1.2 Changes in Energy Flashcards

1
Q

Work done:

A

the energy transferred when a force moves an object over a distance

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2
Q

How do you calculate work done?

A
W = Fs
Work done(J) = Force(N) x distance moved in the direction of the force(m)
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3
Q

How do you calculate the kinetic energy of a moving object:

A

Calculating the kinetic energy of a moving object:
KE = ½ mv²
Kinetic energy (J) = ½ x mass(kg) x velocity (m/s)

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4
Q

How do you calculate the amount of gravitational potential energy gained by an object raised above ground level?

A

PE = mgh

Gravitational potential energy (J) = mass(kg) x gravitational field strength (N/kg) x change in height (m)

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5
Q

How do you calculate the amount of elastic potential energy stored in a stretch spring?

A

Elastic potential energy (E) = 0.5 x spring constant (N/m) x extension ² (m)
EE = ½ ke²

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6
Q

What is work done (elastic potential wise)?

A

When a spring is stretched or compressed

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7
Q

Work done =

A

elastic potential energy (as long as the elastic limit is not exceeded)

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8
Q

What is the kinetic energy of a moving body directly proportional to?

A

the square of its speed

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9
Q

What happens when there is an energy transfer of [elastic potential energy ——→ (mechanical pathway) gravitational potential energy] with an 100% efficient rate?

A

EE = EP

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