Forces Flashcards

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1
Q

Resultant force:

A

mass x acceleration

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2
Q

SI Base units for resulant force:

A

kgms^-2

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3
Q

Define the newton

A

force that will give a mass of 1kg an acceleration of 1 ms^-2

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4
Q

Define weight:

A

the gravitational force acting on an object through its centre of mass

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5
Q

Equation for weight:

A

mass x gravitational field strength

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6
Q

Define friction:

A

the force that arises when 2 surfaces rub against each other

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7
Q

Define drag:

A

the resistive force on an object travelling through a fluid

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8
Q

Define tension:

A

the force within a stretched cable or rope

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9
Q

Define upthrust:

A

the upward buoyancy force acting on an object when it’s in a fluid

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10
Q

Define normal contact force:

A

the force arising when an object rests against another object acting at a 90 angle to the plane of contact

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11
Q

What 3 factors does the magnitude of drag depend on?

A

1) Speed
2) Structure/Shape of object
3) Density of fluid

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12
Q

What is drag proportional to?

A

speed squared

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13
Q

When will drag stop increasing?

A

when equal to weight

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14
Q

What practical measures terminal velocity?

A

dropping ball through viscous liquid

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15
Q

Equation for moments:

A

force x perpendicular distance to pivot

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16
Q

What are equal to 0 if an object is in equilibrium?

A

sum of forces and sum of moments

17
Q

What is a couple?

A

two equal and opposite forces acting a distance apart

18
Q

What is a torque?

A

turning effect

19
Q

Define centre of mass:

A

where the entire weight of an object appears to act

20
Q

Density equation:

A

mass/volume

21
Q

What is the practical to find density?

A

submerging and object in a eureka can (irregular) or measuring objects dimensions (regular)

22
Q

Pressure equation:

A

force/area

23
Q

Pressure in fluids equation:

A

density x height x gfs

24
Q

What is Archimede’s principle?

A

the upthrust exerted on a body immersed in fluid, whether partially or fully submerged is equal to the weight of the fluid displaced

25
Q

What are the 3 steps to finding upthrust?

A

1) Find objects volume
2) Find mass of water displaced using density
3) Find the weight of water displaced