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Physics As OCR > 3.2 > Flashcards

3.2 Flashcards

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1
Q

weight

A

force exerted by earth on an object / force experienced by mass dues to a gravitational field

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2
Q

normal contact force

A

force exerted by a surface on an object perpendicular to that object

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3
Q

friction

A

force exerted by a surface on an object along the parallel direction to the surface opposing the direction of motion

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4
Q

tension

A

force exerted by a stretched string/rope/cable/wire on a subject

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5
Q

upthrust

A

force exerted by a fluid on an object that is totally or partly immersed

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6
Q

drag

A

force exerted by a fluid on an object that is moving inside the fluid

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7
Q

equation to find the horizontal component of the vector

A

xcosϴ

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8
Q

equation to find the vertical component of the vector

A

xsinϴ

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9
Q

mass

A

scalar quantity, how much matter is in a substance

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10
Q

archimedes principal

A

upthrust= the weight of fluid displaced (whether or not something floats or sinks depends upon its density relative to water)

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11
Q

centre of mass

A

single point that you can consider the whole weight of an object to act through. the object will always balance around this point

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12
Q

how to find the centre of mass

A

symmetry or experiment : suspend object twice at two difference points and where the lines they hang through cross = centre of mass

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13
Q

how do you know an object will be stable

A

wide base area and low centre of mass

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14
Q

contact friction

A

friction between solid surfaces

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15
Q

fluid friction

A

drag / air resistance

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16
Q

things to remember about friction

A

oppose direction of motion, convert kinetic energy into heat

17
Q

terminal velocity

A

when friction equals driving force - friction will increase with speed until the friction prevents any further acceleration so a steady speed is reached

18
Q

what affects terminal velocity

A

viscosity of the liquid, size of the thing you are dropping, shape of object, mass of object

19
Q

density

A

a measure of the compactness of a substance mass/vloume

20
Q

pressure in a fluid

A

p=hPg h=depth of submersion, P=density of fluid,

21
Q

moment

A

Turing effect of a force , a force acting perpendicular to a distance from a pivot

22
Q

moment equation

A

m=f x distance from pivot

23
Q

couple

A

pair of forces of equal size which act parallel but opposite to each other

24
Q

torque of a couple=

A

size of one of the forces x perpendicular distance between forces

Physics As OCR (14 decks)

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