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Physics > 4 Forces In Action > Flashcards

4 Forces In Action Flashcards

1
Q

F=ma

A

Force = mass x acceleration

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2
Q

Definition of a Newton

A

The force needed for a mass of 1kg to have an acceleration of 1 ms^-2 in a particular direction

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3
Q

W=mg

A

Weight = mass x gravity

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4
Q

What happens to the mass of an object as it approaches the speed of light

A

Mass increases

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5
Q

Centre of mass

A

The point through which an objects total weight acts

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6
Q

Weight

A

The gravitational force acting on an object through its center of mass

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7
Q

Friction

A

The force that arises when two surfaces rub against each other

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8
Q

Drag

A

The resistive force on an object travelling through a fluid

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9
Q

Tension

A

The force within a stretched cable or rope

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10
Q

Upthrust

A

An upward buoyancy force acting on an object when it is in a fluid

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11
Q

Normal contact force

A

A force arising when one object rests against another object

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12
Q

What is the relationship between drag and speed

A

Drag is directly proportional to speed^2

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13
Q

Terminal velocity

A

When a drag force on the object is equal and opposite to its weight

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14
Q

Moment

A

The turning effect of a force about some axis or point

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15
Q

M=Fx

A

Moment = force x perpendicular distance from the point of rotation

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16
Q

Base SI units of momentum

A

Kg m^2 s^-2

17
Q

The principle of moments

A

For a body in rotational equilibrium the sum of the anticlockwise moments about any point is equal to the sum of the clockwise moments about the same point

18
Q

Couple

A

Two equal but opposite parallel force which act along different lines

19
Q

Torque = Fd

A

Torque = one of the forces x perpendicular distance between forces

20
Q

Torque

A

The moment of a couple

21
Q

What is the average atmospheric pressure

A

101kPa

22
Q

p = h rho g

A

Pressure = height x density x acceleration due to free fall

23
Q

Upthrust = rho g V

A

Upthrust = density x acceleration due to free fall x volume

24
Q

Archimedes principle

A

The Upthrust exerted on a body immersed in a fluid, whether fully or partially submerged is equal to the weight of the fluid that the body displaces

Physics (12 decks)

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