Topic 1 - Forces Flashcards

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0
Q

What is conservation of energy?

A

Energy can neither be created nor destroyed, but may be transferred (converted) from one form to another

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1
Q

What’s a sankey diagram?

A

These diagrams represent energy transfers. The width of the arrows represent the quantity of energy.

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2
Q

What’s Kinetic Energy?

A

This is the energy in an object due to its motion

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3
Q

What does KE depend on?

A

A) the mass of the object

B) the speed of the object

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4
Q

How do you calculate KE?

A

KE=1/2mv^2

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5
Q

What’s the unit for mass?

A

Kg

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6
Q

What’s the unit for velocity?

A

m/s

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7
Q

What’s Gravitational Potential Energy?

A

This is the energy of an object due to its height above the surface of the Earth.

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8
Q

What does GPE depend on?

A

A) mass
B) height
C) the gravitational field strength (g)

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9
Q

How do you calculate GPE?

A

GPE=mgh

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10
Q

What is g measured in?

A

10N/kg

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11
Q

How do you calculate Work Done?

A

Work done=forcexdistance moved in the direction if the force (W=Fd)

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12
Q

What’s Work Done?

A

Work is done when a force moves it’s point of application. It is equal to the energy transferred in the process.

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13
Q

What is F measured in?

A

N

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14
Q

What is d measured in?

A

m

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15
Q

What is W measured in?

A

J

16
Q

How do you define efficiency?

A

Efficiency=useful work done/total input energy x100
= useful energy output/total energy input x100
= useful power output/total power input x100

17
Q

How do you calculate power?

A

P=W/t

18
Q

What’s the unit and symbol for power?

A

Watt/W

19
Q

What’s power?

A

The rate of doing work or consuming energy.