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Physics Paper 2 > Energy > Flashcards

Energy Flashcards

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1
Q

what is power

A

the rate of work done

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2
Q

what is power measured in

A

watts

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3
Q

what is work done

A

the total amount of energy transferred

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4
Q

what is the formula for work done

A

force * distance

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5
Q

what is the formula for power

A

work done / time taken

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6
Q

what are the 2 types of forces

A

Contact and non-contact forces

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7
Q

what is a non-contact force

A

a force that can be exerted between objects without them being in contact with one other

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8
Q

what are the 3 non-contact forces

A

gravity
magnetism
electrostatic charges

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9
Q

what is a contact force

A

a force that is exerted due to 2 objects being in contact and cannot happen without contact

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10
Q

what is the resultant force

A

the overall force on an object

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11
Q

what is a moment

A

a force that acts at a distance from a pivot and has a turning effect

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12
Q

what is the formula for a moment

A

force * distance

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13
Q

what is a lever

A

a simple machine made from a fulcrum

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14
Q

what are the 3 types of levers

A

class 1
class 2
class 3

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15
Q

what is a class 1 lever

A

where the input and output force are on opposite sides of the fulcrum and in opposite direction

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16
Q

what is a class 2 lever

A

where the output force and input force are on the same side. the output force is closer to the fulcrum

17
Q

what is a class 3 lever

A

where the output force and input force are on the same side but the input force is closer to te fulcrum

18
Q

what are gears

A

toothed wheels that are meshed together and can transmit rotational forces and motion

19
Q

what are the 2 types of gears

A

high gear
low gear

20
Q

what is a high gear

A

when a larg input gear turns a smaller output gear which leads to a high speed and low turning effect

21
Q

what is a low-gear

A

where a smaller input gear turns a larger output gear which leads to a low speed and high turning effect

22
Q

what is the similarity between gears and levers

A

both transmit the rotational effect of forces

Physics Paper 2 (10 decks)

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